Post on 21-Mar-2018
Jet Study In CMS Detector
Sanmay GangulyDepartment Of High Energy Physics
Tata Institute Of Fundamental Research
June 7, 2011
Sanmay Ganguly Department Of High Energy Physics Tata Institute Of Fundamental Research ()Jet Study In CMS Detector June 7, 2011 1 / 51
Table of contents
1 Jets In Colliders
2 Necessity Of JEC
3 Different Jet Correction
4 Jet Identification
5 Plots For Jet Spectrum
6 The Physics Goal
7 Backup
Sanmay Ganguly Department Of High Energy Physics Tata Institute Of Fundamental Research ()Jet Study In CMS Detector June 7, 2011 2 / 51
Jets in Colliders
In a hard process(p-pcollision),the emitted quarks and gluonshadronize to produce jets,which are detected in the detectors
The spectrum of the jets contain information about the parton levelinteraction.Therefore jet spectrum study is important for the physicsstudy in a hadron collider machine.Radiative Emission of partons is also one of the main backgrounds ofmultijet signal to new physics.So detailed study of the background isalso very important.
Sanmay Ganguly Department Of High Energy Physics Tata Institute Of Fundamental Research ()Jet Study In CMS Detector June 7, 2011 3 / 51
Jets in Colliders
In a hard process(p-pcollision),the emitted quarks and gluonshadronize to produce jets,which are detected in the detectorsThe spectrum of the jets contain information about the parton levelinteraction.Therefore jet spectrum study is important for the physicsstudy in a hadron collider machine.
Radiative Emission of partons is also one of the main backgrounds ofmultijet signal to new physics.So detailed study of the background isalso very important.
Sanmay Ganguly Department Of High Energy Physics Tata Institute Of Fundamental Research ()Jet Study In CMS Detector June 7, 2011 3 / 51
Jets in Colliders
In a hard process(p-pcollision),the emitted quarks and gluonshadronize to produce jets,which are detected in the detectorsThe spectrum of the jets contain information about the parton levelinteraction.Therefore jet spectrum study is important for the physicsstudy in a hadron collider machine.Radiative Emission of partons is also one of the main backgrounds ofmultijet signal to new physics.So detailed study of the background isalso very important.
Sanmay Ganguly Department Of High Energy Physics Tata Institute Of Fundamental Research ()Jet Study In CMS Detector June 7, 2011 3 / 51
Jets in Colliders
In a hard process(p-pcollision),the emitted quarks and gluonshadronize to produce jets,which are detected in the detectorsThe spectrum of the jets contain information about the parton levelinteraction.Therefore jet spectrum study is important for the physicsstudy in a hadron collider machine.Radiative Emission of partons is also one of the main backgrounds ofmultijet signal to new physics.So detailed study of the background isalso very important.
Sanmay Ganguly Department Of High Energy Physics Tata Institute Of Fundamental Research ()Jet Study In CMS Detector June 7, 2011 3 / 51
Jets continued.....
A Standard Parton Level Hard Interaction Process
Sanmay Ganguly Department Of High Energy Physics Tata Institute Of Fundamental Research ()Jet Study In CMS Detector June 7, 2011 4 / 51
Different Kind Of Jets and Jet Reconstruction
The main inputs in Jet reconstruction are Jet cone size and JetAlgorithm.
The different algorithm used in CMS for Jet reconstruction are•kT•Anti-kT•IterativiCone•SisconeThe different types of jets analyzed in CMS framework are•Genjet: It is the generator level jet produced from particle levelinformation.•Calojet: It is the jet reconstructed from Calorimeter Towerinformation.•Particle Flow(PF)Jet: this is the jet reconstructed directly at theparticle level from the different components of the detector.viz.Ecal,HCal,Tracker•Jet Plus Track (JPT)Jet: Its the jet reconstructed from both trackerand calorimeter.
Sanmay Ganguly Department Of High Energy Physics Tata Institute Of Fundamental Research ()Jet Study In CMS Detector June 7, 2011 5 / 51
Different Kind Of Jets and Jet Reconstruction
The main inputs in Jet reconstruction are Jet cone size and JetAlgorithm.The different algorithm used in CMS for Jet reconstruction are
•kT•Anti-kT•IterativiCone•SisconeThe different types of jets analyzed in CMS framework are•Genjet: It is the generator level jet produced from particle levelinformation.•Calojet: It is the jet reconstructed from Calorimeter Towerinformation.•Particle Flow(PF)Jet: this is the jet reconstructed directly at theparticle level from the different components of the detector.viz.Ecal,HCal,Tracker•Jet Plus Track (JPT)Jet: Its the jet reconstructed from both trackerand calorimeter.
Sanmay Ganguly Department Of High Energy Physics Tata Institute Of Fundamental Research ()Jet Study In CMS Detector June 7, 2011 5 / 51
Different Kind Of Jets and Jet Reconstruction
The main inputs in Jet reconstruction are Jet cone size and JetAlgorithm.The different algorithm used in CMS for Jet reconstruction are•kT
•Anti-kT•IterativiCone•SisconeThe different types of jets analyzed in CMS framework are•Genjet: It is the generator level jet produced from particle levelinformation.•Calojet: It is the jet reconstructed from Calorimeter Towerinformation.•Particle Flow(PF)Jet: this is the jet reconstructed directly at theparticle level from the different components of the detector.viz.Ecal,HCal,Tracker•Jet Plus Track (JPT)Jet: Its the jet reconstructed from both trackerand calorimeter.
Sanmay Ganguly Department Of High Energy Physics Tata Institute Of Fundamental Research ()Jet Study In CMS Detector June 7, 2011 5 / 51
Different Kind Of Jets and Jet Reconstruction
The main inputs in Jet reconstruction are Jet cone size and JetAlgorithm.The different algorithm used in CMS for Jet reconstruction are•kT•Anti-kT
•IterativiCone•SisconeThe different types of jets analyzed in CMS framework are•Genjet: It is the generator level jet produced from particle levelinformation.•Calojet: It is the jet reconstructed from Calorimeter Towerinformation.•Particle Flow(PF)Jet: this is the jet reconstructed directly at theparticle level from the different components of the detector.viz.Ecal,HCal,Tracker•Jet Plus Track (JPT)Jet: Its the jet reconstructed from both trackerand calorimeter.
Sanmay Ganguly Department Of High Energy Physics Tata Institute Of Fundamental Research ()Jet Study In CMS Detector June 7, 2011 5 / 51
Different Kind Of Jets and Jet Reconstruction
The main inputs in Jet reconstruction are Jet cone size and JetAlgorithm.The different algorithm used in CMS for Jet reconstruction are•kT•Anti-kT•IterativiCone
•SisconeThe different types of jets analyzed in CMS framework are•Genjet: It is the generator level jet produced from particle levelinformation.•Calojet: It is the jet reconstructed from Calorimeter Towerinformation.•Particle Flow(PF)Jet: this is the jet reconstructed directly at theparticle level from the different components of the detector.viz.Ecal,HCal,Tracker•Jet Plus Track (JPT)Jet: Its the jet reconstructed from both trackerand calorimeter.
Sanmay Ganguly Department Of High Energy Physics Tata Institute Of Fundamental Research ()Jet Study In CMS Detector June 7, 2011 5 / 51
Different Kind Of Jets and Jet Reconstruction
The main inputs in Jet reconstruction are Jet cone size and JetAlgorithm.The different algorithm used in CMS for Jet reconstruction are•kT•Anti-kT•IterativiCone•SisconeThe different types of jets analyzed in CMS framework are
•Genjet: It is the generator level jet produced from particle levelinformation.•Calojet: It is the jet reconstructed from Calorimeter Towerinformation.•Particle Flow(PF)Jet: this is the jet reconstructed directly at theparticle level from the different components of the detector.viz.Ecal,HCal,Tracker•Jet Plus Track (JPT)Jet: Its the jet reconstructed from both trackerand calorimeter.
Sanmay Ganguly Department Of High Energy Physics Tata Institute Of Fundamental Research ()Jet Study In CMS Detector June 7, 2011 5 / 51
Different Kind Of Jets and Jet Reconstruction
The main inputs in Jet reconstruction are Jet cone size and JetAlgorithm.The different algorithm used in CMS for Jet reconstruction are•kT•Anti-kT•IterativiCone•SisconeThe different types of jets analyzed in CMS framework are•Genjet: It is the generator level jet produced from particle levelinformation.
•Calojet: It is the jet reconstructed from Calorimeter Towerinformation.•Particle Flow(PF)Jet: this is the jet reconstructed directly at theparticle level from the different components of the detector.viz.Ecal,HCal,Tracker•Jet Plus Track (JPT)Jet: Its the jet reconstructed from both trackerand calorimeter.
Sanmay Ganguly Department Of High Energy Physics Tata Institute Of Fundamental Research ()Jet Study In CMS Detector June 7, 2011 5 / 51
Different Kind Of Jets and Jet Reconstruction
The main inputs in Jet reconstruction are Jet cone size and JetAlgorithm.The different algorithm used in CMS for Jet reconstruction are•kT•Anti-kT•IterativiCone•SisconeThe different types of jets analyzed in CMS framework are•Genjet: It is the generator level jet produced from particle levelinformation.•Calojet: It is the jet reconstructed from Calorimeter Towerinformation.
•Particle Flow(PF)Jet: this is the jet reconstructed directly at theparticle level from the different components of the detector.viz.Ecal,HCal,Tracker•Jet Plus Track (JPT)Jet: Its the jet reconstructed from both trackerand calorimeter.
Sanmay Ganguly Department Of High Energy Physics Tata Institute Of Fundamental Research ()Jet Study In CMS Detector June 7, 2011 5 / 51
Different Kind Of Jets and Jet Reconstruction
The main inputs in Jet reconstruction are Jet cone size and JetAlgorithm.The different algorithm used in CMS for Jet reconstruction are•kT•Anti-kT•IterativiCone•SisconeThe different types of jets analyzed in CMS framework are•Genjet: It is the generator level jet produced from particle levelinformation.•Calojet: It is the jet reconstructed from Calorimeter Towerinformation.•Particle Flow(PF)Jet: this is the jet reconstructed directly at theparticle level from the different components of the detector.viz.Ecal,HCal,Tracker
•Jet Plus Track (JPT)Jet: Its the jet reconstructed from both trackerand calorimeter.
Sanmay Ganguly Department Of High Energy Physics Tata Institute Of Fundamental Research ()Jet Study In CMS Detector June 7, 2011 5 / 51
Different Kind Of Jets and Jet Reconstruction
The main inputs in Jet reconstruction are Jet cone size and JetAlgorithm.The different algorithm used in CMS for Jet reconstruction are•kT•Anti-kT•IterativiCone•SisconeThe different types of jets analyzed in CMS framework are•Genjet: It is the generator level jet produced from particle levelinformation.•Calojet: It is the jet reconstructed from Calorimeter Towerinformation.•Particle Flow(PF)Jet: this is the jet reconstructed directly at theparticle level from the different components of the detector.viz.Ecal,HCal,Tracker•Jet Plus Track (JPT)Jet: Its the jet reconstructed from both trackerand calorimeter.
Sanmay Ganguly Department Of High Energy Physics Tata Institute Of Fundamental Research ()Jet Study In CMS Detector June 7, 2011 5 / 51
Different Kind Of Jets and Jet Reconstruction
The main inputs in Jet reconstruction are Jet cone size and JetAlgorithm.The different algorithm used in CMS for Jet reconstruction are•kT•Anti-kT•IterativiCone•SisconeThe different types of jets analyzed in CMS framework are•Genjet: It is the generator level jet produced from particle levelinformation.•Calojet: It is the jet reconstructed from Calorimeter Towerinformation.•Particle Flow(PF)Jet: this is the jet reconstructed directly at theparticle level from the different components of the detector.viz.Ecal,HCal,Tracker•Jet Plus Track (JPT)Jet: Its the jet reconstructed from both trackerand calorimeter.
Sanmay Ganguly Department Of High Energy Physics Tata Institute Of Fundamental Research ()Jet Study In CMS Detector June 7, 2011 5 / 51
The Necessity Of JEC and Its Differnt Types
of 1st Jet(GeV)TE0 200 400 600 800 100012001400160018002000
)-1
(GeV
)T
d(EdN
0
5
10
15
20
25
30
35
40
45genjet-1
A Typical Leading Jet ET Distribution(GenJet)(pt bin 800-1000)
Sanmay Ganguly Department Of High Energy Physics Tata Institute Of Fundamental Research ()Jet Study In CMS Detector June 7, 2011 6 / 51
JEC continued.....
of 1st Jet(GeV)TE0 200 400 600 800 100012001400160018002000
)-1
(GeV
)T
d(EdN
0
5
10
15
20
25
30
35
40
45 genjet-1
calojet-1
The Same Plot With Corresponding CaloJet ET
Sanmay Ganguly Department Of High Energy Physics Tata Institute Of Fundamental Research ()Jet Study In CMS Detector June 7, 2011 7 / 51
JEC continued.....
The previous two plots show that a typical spectrum of areconstructed jet from detector,doesn’t match with the correspondinggenerator level jet.Hence we need Jet Energy Correction(JEC).
The goal of JEC is to relate on average,the spectrum(ET ,η,φ..)measured at the detector to the spectrum of a hard scattered partonin the final state process.
Sanmay Ganguly Department Of High Energy Physics Tata Institute Of Fundamental Research ()Jet Study In CMS Detector June 7, 2011 8 / 51
JEC continued.....
The previous two plots show that a typical spectrum of areconstructed jet from detector,doesn’t match with the correspondinggenerator level jet.Hence we need Jet Energy Correction(JEC).
The goal of JEC is to relate on average,the spectrum(ET ,η,φ..)measured at the detector to the spectrum of a hard scattered partonin the final state process.
Sanmay Ganguly Department Of High Energy Physics Tata Institute Of Fundamental Research ()Jet Study In CMS Detector June 7, 2011 8 / 51
JEC continued.....
The previous two plots show that a typical spectrum of areconstructed jet from detector,doesn’t match with the correspondinggenerator level jet.Hence we need Jet Energy Correction(JEC).
The goal of JEC is to relate on average,the spectrum(ET ,η,φ..)measured at the detector to the spectrum of a hard scattered partonin the final state process.
Sanmay Ganguly Department Of High Energy Physics Tata Institute Of Fundamental Research ()Jet Study In CMS Detector June 7, 2011 8 / 51
Multi Level Jet Correction
CMS is devoloping a factorized multi-level jet correction in which thecorrection is applied in the following sequence
Offset:Required correction for pile-up and electronic noise.
Relative(η):Required correction for variation in jet response withpseudorapidity(η) relative to a control region.
Absolute (pT ):Required correction to particle level versus jet pT inthe control region.
EMF:Optional correction for variations in jet response withelectromagnetic energy fraction.
Flavour: Optional correction to particle level for different types of jets(light quark,c,b,gluon).
Underlying Event :Optional correction for underlying event energy.
Parton:Optional correction to parton level.
Sanmay Ganguly Department Of High Energy Physics Tata Institute Of Fundamental Research ()Jet Study In CMS Detector June 7, 2011 9 / 51
Multi Level Jet Correction
CMS is devoloping a factorized multi-level jet correction in which thecorrection is applied in the following sequence
Offset:Required correction for pile-up and electronic noise.
Relative(η):Required correction for variation in jet response withpseudorapidity(η) relative to a control region.
Absolute (pT ):Required correction to particle level versus jet pT inthe control region.
EMF:Optional correction for variations in jet response withelectromagnetic energy fraction.
Flavour: Optional correction to particle level for different types of jets(light quark,c,b,gluon).
Underlying Event :Optional correction for underlying event energy.
Parton:Optional correction to parton level.
Sanmay Ganguly Department Of High Energy Physics Tata Institute Of Fundamental Research ()Jet Study In CMS Detector June 7, 2011 9 / 51
Multi Level Jet Correction
CMS is devoloping a factorized multi-level jet correction in which thecorrection is applied in the following sequence
Offset:Required correction for pile-up and electronic noise.
Relative(η):Required correction for variation in jet response withpseudorapidity(η) relative to a control region.
Absolute (pT ):Required correction to particle level versus jet pT inthe control region.
EMF:Optional correction for variations in jet response withelectromagnetic energy fraction.
Flavour: Optional correction to particle level for different types of jets(light quark,c,b,gluon).
Underlying Event :Optional correction for underlying event energy.
Parton:Optional correction to parton level.
Sanmay Ganguly Department Of High Energy Physics Tata Institute Of Fundamental Research ()Jet Study In CMS Detector June 7, 2011 9 / 51
Multi Level Jet Correction
CMS is devoloping a factorized multi-level jet correction in which thecorrection is applied in the following sequence
Offset:Required correction for pile-up and electronic noise.
Relative(η):Required correction for variation in jet response withpseudorapidity(η) relative to a control region.
Absolute (pT ):Required correction to particle level versus jet pT inthe control region.
EMF:Optional correction for variations in jet response withelectromagnetic energy fraction.
Flavour: Optional correction to particle level for different types of jets(light quark,c,b,gluon).
Underlying Event :Optional correction for underlying event energy.
Parton:Optional correction to parton level.
Sanmay Ganguly Department Of High Energy Physics Tata Institute Of Fundamental Research ()Jet Study In CMS Detector June 7, 2011 9 / 51
Multi Level Jet Correction
CMS is devoloping a factorized multi-level jet correction in which thecorrection is applied in the following sequence
Offset:Required correction for pile-up and electronic noise.
Relative(η):Required correction for variation in jet response withpseudorapidity(η) relative to a control region.
Absolute (pT ):Required correction to particle level versus jet pT inthe control region.
EMF:Optional correction for variations in jet response withelectromagnetic energy fraction.
Flavour: Optional correction to particle level for different types of jets(light quark,c,b,gluon).
Underlying Event :Optional correction for underlying event energy.
Parton:Optional correction to parton level.
Sanmay Ganguly Department Of High Energy Physics Tata Institute Of Fundamental Research ()Jet Study In CMS Detector June 7, 2011 9 / 51
Multi Level Jet Correction
CMS is devoloping a factorized multi-level jet correction in which thecorrection is applied in the following sequence
Offset:Required correction for pile-up and electronic noise.
Relative(η):Required correction for variation in jet response withpseudorapidity(η) relative to a control region.
Absolute (pT ):Required correction to particle level versus jet pT inthe control region.
EMF:Optional correction for variations in jet response withelectromagnetic energy fraction.
Flavour: Optional correction to particle level for different types of jets(light quark,c,b,gluon).
Underlying Event :Optional correction for underlying event energy.
Parton:Optional correction to parton level.
Sanmay Ganguly Department Of High Energy Physics Tata Institute Of Fundamental Research ()Jet Study In CMS Detector June 7, 2011 9 / 51
Multi Level Jet Correction
CMS is devoloping a factorized multi-level jet correction in which thecorrection is applied in the following sequence
Offset:Required correction for pile-up and electronic noise.
Relative(η):Required correction for variation in jet response withpseudorapidity(η) relative to a control region.
Absolute (pT ):Required correction to particle level versus jet pT inthe control region.
EMF:Optional correction for variations in jet response withelectromagnetic energy fraction.
Flavour: Optional correction to particle level for different types of jets(light quark,c,b,gluon).
Underlying Event :Optional correction for underlying event energy.
Parton:Optional correction to parton level.
Sanmay Ganguly Department Of High Energy Physics Tata Institute Of Fundamental Research ()Jet Study In CMS Detector June 7, 2011 9 / 51
Multi Level Jet Correction
CMS is devoloping a factorized multi-level jet correction in which thecorrection is applied in the following sequence
Offset:Required correction for pile-up and electronic noise.
Relative(η):Required correction for variation in jet response withpseudorapidity(η) relative to a control region.
Absolute (pT ):Required correction to particle level versus jet pT inthe control region.
EMF:Optional correction for variations in jet response withelectromagnetic energy fraction.
Flavour: Optional correction to particle level for different types of jets(light quark,c,b,gluon).
Underlying Event :Optional correction for underlying event energy.
Parton:Optional correction to parton level.
Sanmay Ganguly Department Of High Energy Physics Tata Institute Of Fundamental Research ()Jet Study In CMS Detector June 7, 2011 9 / 51
Multi Level Jet Correction
CMS is devoloping a factorized multi-level jet correction in which thecorrection is applied in the following sequence
Offset:Required correction for pile-up and electronic noise.
Relative(η):Required correction for variation in jet response withpseudorapidity(η) relative to a control region.
Absolute (pT ):Required correction to particle level versus jet pT inthe control region.
EMF:Optional correction for variations in jet response withelectromagnetic energy fraction.
Flavour: Optional correction to particle level for different types of jets(light quark,c,b,gluon).
Underlying Event :Optional correction for underlying event energy.
Parton:Optional correction to parton level.
Sanmay Ganguly Department Of High Energy Physics Tata Institute Of Fundamental Research ()Jet Study In CMS Detector June 7, 2011 9 / 51
Jet Correction Formula
Jet Correction Formula
ECorrjet = (ERaw
jet − Eoffset)× C (rel : η)× C (abs : pT )
For our current analysis we use the three corrections L2L3residualcorrection.
Sanmay Ganguly Department Of High Energy Physics Tata Institute Of Fundamental Research ()Jet Study In CMS Detector June 7, 2011 10 / 51
Jet-Id used
We use the LOOSE jet identification criteria to reject the fake jetsduring jet collection.
The Jet-Id for the calorimeter jets are•n90hit≥1 for the region HBHE•EM-fraction ≥ 0.01•fHPD ≤ 0.98
The Jet-Id for the particle-flow jets are•Neutral Hadron Fraction ≤ 0.99•Neutral EM Fraction ≤ 0.99•Number of Constituents ≥ 1•And for |η| ≤ 2.4 in addition apply•Charged Hadron Fraction ≥ 0•Charged Multiplicity ≥ 0•Charged EM Fraction ≤ 0.99
Sanmay Ganguly Department Of High Energy Physics Tata Institute Of Fundamental Research ()Jet Study In CMS Detector June 7, 2011 11 / 51
Jet-Id used
We use the LOOSE jet identification criteria to reject the fake jetsduring jet collection.
The Jet-Id for the calorimeter jets are
•n90hit≥1 for the region HBHE•EM-fraction ≥ 0.01•fHPD ≤ 0.98
The Jet-Id for the particle-flow jets are•Neutral Hadron Fraction ≤ 0.99•Neutral EM Fraction ≤ 0.99•Number of Constituents ≥ 1•And for |η| ≤ 2.4 in addition apply•Charged Hadron Fraction ≥ 0•Charged Multiplicity ≥ 0•Charged EM Fraction ≤ 0.99
Sanmay Ganguly Department Of High Energy Physics Tata Institute Of Fundamental Research ()Jet Study In CMS Detector June 7, 2011 11 / 51
Jet-Id used
We use the LOOSE jet identification criteria to reject the fake jetsduring jet collection.
The Jet-Id for the calorimeter jets are•n90hit≥1 for the region HBHE
•EM-fraction ≥ 0.01•fHPD ≤ 0.98
The Jet-Id for the particle-flow jets are•Neutral Hadron Fraction ≤ 0.99•Neutral EM Fraction ≤ 0.99•Number of Constituents ≥ 1•And for |η| ≤ 2.4 in addition apply•Charged Hadron Fraction ≥ 0•Charged Multiplicity ≥ 0•Charged EM Fraction ≤ 0.99
Sanmay Ganguly Department Of High Energy Physics Tata Institute Of Fundamental Research ()Jet Study In CMS Detector June 7, 2011 11 / 51
Jet-Id used
We use the LOOSE jet identification criteria to reject the fake jetsduring jet collection.
The Jet-Id for the calorimeter jets are•n90hit≥1 for the region HBHE•EM-fraction ≥ 0.01
•fHPD ≤ 0.98
The Jet-Id for the particle-flow jets are•Neutral Hadron Fraction ≤ 0.99•Neutral EM Fraction ≤ 0.99•Number of Constituents ≥ 1•And for |η| ≤ 2.4 in addition apply•Charged Hadron Fraction ≥ 0•Charged Multiplicity ≥ 0•Charged EM Fraction ≤ 0.99
Sanmay Ganguly Department Of High Energy Physics Tata Institute Of Fundamental Research ()Jet Study In CMS Detector June 7, 2011 11 / 51
Jet-Id used
We use the LOOSE jet identification criteria to reject the fake jetsduring jet collection.
The Jet-Id for the calorimeter jets are•n90hit≥1 for the region HBHE•EM-fraction ≥ 0.01•fHPD ≤ 0.98
The Jet-Id for the particle-flow jets are•Neutral Hadron Fraction ≤ 0.99•Neutral EM Fraction ≤ 0.99•Number of Constituents ≥ 1•And for |η| ≤ 2.4 in addition apply•Charged Hadron Fraction ≥ 0•Charged Multiplicity ≥ 0•Charged EM Fraction ≤ 0.99
Sanmay Ganguly Department Of High Energy Physics Tata Institute Of Fundamental Research ()Jet Study In CMS Detector June 7, 2011 11 / 51
Jet-Id used
We use the LOOSE jet identification criteria to reject the fake jetsduring jet collection.
The Jet-Id for the calorimeter jets are•n90hit≥1 for the region HBHE•EM-fraction ≥ 0.01•fHPD ≤ 0.98
The Jet-Id for the particle-flow jets are
•Neutral Hadron Fraction ≤ 0.99•Neutral EM Fraction ≤ 0.99•Number of Constituents ≥ 1•And for |η| ≤ 2.4 in addition apply•Charged Hadron Fraction ≥ 0•Charged Multiplicity ≥ 0•Charged EM Fraction ≤ 0.99
Sanmay Ganguly Department Of High Energy Physics Tata Institute Of Fundamental Research ()Jet Study In CMS Detector June 7, 2011 11 / 51
Jet-Id used
We use the LOOSE jet identification criteria to reject the fake jetsduring jet collection.
The Jet-Id for the calorimeter jets are•n90hit≥1 for the region HBHE•EM-fraction ≥ 0.01•fHPD ≤ 0.98
The Jet-Id for the particle-flow jets are•Neutral Hadron Fraction ≤ 0.99
•Neutral EM Fraction ≤ 0.99•Number of Constituents ≥ 1•And for |η| ≤ 2.4 in addition apply•Charged Hadron Fraction ≥ 0•Charged Multiplicity ≥ 0•Charged EM Fraction ≤ 0.99
Sanmay Ganguly Department Of High Energy Physics Tata Institute Of Fundamental Research ()Jet Study In CMS Detector June 7, 2011 11 / 51
Jet-Id used
We use the LOOSE jet identification criteria to reject the fake jetsduring jet collection.
The Jet-Id for the calorimeter jets are•n90hit≥1 for the region HBHE•EM-fraction ≥ 0.01•fHPD ≤ 0.98
The Jet-Id for the particle-flow jets are•Neutral Hadron Fraction ≤ 0.99•Neutral EM Fraction ≤ 0.99
•Number of Constituents ≥ 1•And for |η| ≤ 2.4 in addition apply•Charged Hadron Fraction ≥ 0•Charged Multiplicity ≥ 0•Charged EM Fraction ≤ 0.99
Sanmay Ganguly Department Of High Energy Physics Tata Institute Of Fundamental Research ()Jet Study In CMS Detector June 7, 2011 11 / 51
Jet-Id used
We use the LOOSE jet identification criteria to reject the fake jetsduring jet collection.
The Jet-Id for the calorimeter jets are•n90hit≥1 for the region HBHE•EM-fraction ≥ 0.01•fHPD ≤ 0.98
The Jet-Id for the particle-flow jets are•Neutral Hadron Fraction ≤ 0.99•Neutral EM Fraction ≤ 0.99•Number of Constituents ≥ 1
•And for |η| ≤ 2.4 in addition apply•Charged Hadron Fraction ≥ 0•Charged Multiplicity ≥ 0•Charged EM Fraction ≤ 0.99
Sanmay Ganguly Department Of High Energy Physics Tata Institute Of Fundamental Research ()Jet Study In CMS Detector June 7, 2011 11 / 51
Jet-Id used
We use the LOOSE jet identification criteria to reject the fake jetsduring jet collection.
The Jet-Id for the calorimeter jets are•n90hit≥1 for the region HBHE•EM-fraction ≥ 0.01•fHPD ≤ 0.98
The Jet-Id for the particle-flow jets are•Neutral Hadron Fraction ≤ 0.99•Neutral EM Fraction ≤ 0.99•Number of Constituents ≥ 1•And for |η| ≤ 2.4 in addition apply•Charged Hadron Fraction ≥ 0
•Charged Multiplicity ≥ 0•Charged EM Fraction ≤ 0.99
Sanmay Ganguly Department Of High Energy Physics Tata Institute Of Fundamental Research ()Jet Study In CMS Detector June 7, 2011 11 / 51
Jet-Id used
We use the LOOSE jet identification criteria to reject the fake jetsduring jet collection.
The Jet-Id for the calorimeter jets are•n90hit≥1 for the region HBHE•EM-fraction ≥ 0.01•fHPD ≤ 0.98
The Jet-Id for the particle-flow jets are•Neutral Hadron Fraction ≤ 0.99•Neutral EM Fraction ≤ 0.99•Number of Constituents ≥ 1•And for |η| ≤ 2.4 in addition apply•Charged Hadron Fraction ≥ 0•Charged Multiplicity ≥ 0
•Charged EM Fraction ≤ 0.99
Sanmay Ganguly Department Of High Energy Physics Tata Institute Of Fundamental Research ()Jet Study In CMS Detector June 7, 2011 11 / 51
Jet-Id used
We use the LOOSE jet identification criteria to reject the fake jetsduring jet collection.
The Jet-Id for the calorimeter jets are•n90hit≥1 for the region HBHE•EM-fraction ≥ 0.01•fHPD ≤ 0.98
The Jet-Id for the particle-flow jets are•Neutral Hadron Fraction ≤ 0.99•Neutral EM Fraction ≤ 0.99•Number of Constituents ≥ 1•And for |η| ≤ 2.4 in addition apply•Charged Hadron Fraction ≥ 0•Charged Multiplicity ≥ 0•Charged EM Fraction ≤ 0.99
Sanmay Ganguly Department Of High Energy Physics Tata Institute Of Fundamental Research ()Jet Study In CMS Detector June 7, 2011 11 / 51
The Data and MC samples
The MC samples taken for study :
•/QCDPt-50to80-TuneZ2-7TeV-pythia6/Spring11-PU-S3-START311-V1G1-v1/AODSIM•/QCD-Pt-80to120-TuneZ2-7TeV-pythia6/Spring11-PU-S3-START311-V1G1-v1/AODSIM•/QCD-Pt-120to170-TuneZ2-7TeV-pythia6/Spring11-PU-S3-START311-V1G1-v1/AODSIM•/QCD-Pt-170to300-TuneZ2-7TeV-pythia6/Spring11-PU-S3-START311-V1G1-v1/AODSIM•/QCD-Pt-300to470-TuneZ2-7TeV-pythia6/Spring11-PU-S3-START311-V1G1-v1/AODSIM•/QCD-Pt-470to600-TuneZ2-7TeV-pythia6/Spring11-PU-S3-START311-V1G1-v1/AODSIM•/QCD-Pt-600to800-TuneZ2-7TeV-pythia6/Spring11-PU-S3-START311-V1G1-v1/AODSIM
Sanmay Ganguly Department Of High Energy Physics Tata Institute Of Fundamental Research ()Jet Study In CMS Detector June 7, 2011 12 / 51
The Data and MC samples
The MC samples taken for study :•/QCDPt-50to80-TuneZ2-7TeV-pythia6/Spring11-PU-S3-START311-V1G1-v1/AODSIM
•/QCD-Pt-80to120-TuneZ2-7TeV-pythia6/Spring11-PU-S3-START311-V1G1-v1/AODSIM•/QCD-Pt-120to170-TuneZ2-7TeV-pythia6/Spring11-PU-S3-START311-V1G1-v1/AODSIM•/QCD-Pt-170to300-TuneZ2-7TeV-pythia6/Spring11-PU-S3-START311-V1G1-v1/AODSIM•/QCD-Pt-300to470-TuneZ2-7TeV-pythia6/Spring11-PU-S3-START311-V1G1-v1/AODSIM•/QCD-Pt-470to600-TuneZ2-7TeV-pythia6/Spring11-PU-S3-START311-V1G1-v1/AODSIM•/QCD-Pt-600to800-TuneZ2-7TeV-pythia6/Spring11-PU-S3-START311-V1G1-v1/AODSIM
Sanmay Ganguly Department Of High Energy Physics Tata Institute Of Fundamental Research ()Jet Study In CMS Detector June 7, 2011 12 / 51
The Data and MC samples
The MC samples taken for study :•/QCDPt-50to80-TuneZ2-7TeV-pythia6/Spring11-PU-S3-START311-V1G1-v1/AODSIM•/QCD-Pt-80to120-TuneZ2-7TeV-pythia6/Spring11-PU-S3-START311-V1G1-v1/AODSIM
•/QCD-Pt-120to170-TuneZ2-7TeV-pythia6/Spring11-PU-S3-START311-V1G1-v1/AODSIM•/QCD-Pt-170to300-TuneZ2-7TeV-pythia6/Spring11-PU-S3-START311-V1G1-v1/AODSIM•/QCD-Pt-300to470-TuneZ2-7TeV-pythia6/Spring11-PU-S3-START311-V1G1-v1/AODSIM•/QCD-Pt-470to600-TuneZ2-7TeV-pythia6/Spring11-PU-S3-START311-V1G1-v1/AODSIM•/QCD-Pt-600to800-TuneZ2-7TeV-pythia6/Spring11-PU-S3-START311-V1G1-v1/AODSIM
Sanmay Ganguly Department Of High Energy Physics Tata Institute Of Fundamental Research ()Jet Study In CMS Detector June 7, 2011 12 / 51
The Data and MC samples
The MC samples taken for study :•/QCDPt-50to80-TuneZ2-7TeV-pythia6/Spring11-PU-S3-START311-V1G1-v1/AODSIM•/QCD-Pt-80to120-TuneZ2-7TeV-pythia6/Spring11-PU-S3-START311-V1G1-v1/AODSIM•/QCD-Pt-120to170-TuneZ2-7TeV-pythia6/Spring11-PU-S3-START311-V1G1-v1/AODSIM
•/QCD-Pt-170to300-TuneZ2-7TeV-pythia6/Spring11-PU-S3-START311-V1G1-v1/AODSIM•/QCD-Pt-300to470-TuneZ2-7TeV-pythia6/Spring11-PU-S3-START311-V1G1-v1/AODSIM•/QCD-Pt-470to600-TuneZ2-7TeV-pythia6/Spring11-PU-S3-START311-V1G1-v1/AODSIM•/QCD-Pt-600to800-TuneZ2-7TeV-pythia6/Spring11-PU-S3-START311-V1G1-v1/AODSIM
Sanmay Ganguly Department Of High Energy Physics Tata Institute Of Fundamental Research ()Jet Study In CMS Detector June 7, 2011 12 / 51
The Data and MC samples
The MC samples taken for study :•/QCDPt-50to80-TuneZ2-7TeV-pythia6/Spring11-PU-S3-START311-V1G1-v1/AODSIM•/QCD-Pt-80to120-TuneZ2-7TeV-pythia6/Spring11-PU-S3-START311-V1G1-v1/AODSIM•/QCD-Pt-120to170-TuneZ2-7TeV-pythia6/Spring11-PU-S3-START311-V1G1-v1/AODSIM•/QCD-Pt-170to300-TuneZ2-7TeV-pythia6/Spring11-PU-S3-START311-V1G1-v1/AODSIM
•/QCD-Pt-300to470-TuneZ2-7TeV-pythia6/Spring11-PU-S3-START311-V1G1-v1/AODSIM•/QCD-Pt-470to600-TuneZ2-7TeV-pythia6/Spring11-PU-S3-START311-V1G1-v1/AODSIM•/QCD-Pt-600to800-TuneZ2-7TeV-pythia6/Spring11-PU-S3-START311-V1G1-v1/AODSIM
Sanmay Ganguly Department Of High Energy Physics Tata Institute Of Fundamental Research ()Jet Study In CMS Detector June 7, 2011 12 / 51
The Data and MC samples
The MC samples taken for study :•/QCDPt-50to80-TuneZ2-7TeV-pythia6/Spring11-PU-S3-START311-V1G1-v1/AODSIM•/QCD-Pt-80to120-TuneZ2-7TeV-pythia6/Spring11-PU-S3-START311-V1G1-v1/AODSIM•/QCD-Pt-120to170-TuneZ2-7TeV-pythia6/Spring11-PU-S3-START311-V1G1-v1/AODSIM•/QCD-Pt-170to300-TuneZ2-7TeV-pythia6/Spring11-PU-S3-START311-V1G1-v1/AODSIM•/QCD-Pt-300to470-TuneZ2-7TeV-pythia6/Spring11-PU-S3-START311-V1G1-v1/AODSIM
•/QCD-Pt-470to600-TuneZ2-7TeV-pythia6/Spring11-PU-S3-START311-V1G1-v1/AODSIM•/QCD-Pt-600to800-TuneZ2-7TeV-pythia6/Spring11-PU-S3-START311-V1G1-v1/AODSIM
Sanmay Ganguly Department Of High Energy Physics Tata Institute Of Fundamental Research ()Jet Study In CMS Detector June 7, 2011 12 / 51
The Data and MC samples
The MC samples taken for study :•/QCDPt-50to80-TuneZ2-7TeV-pythia6/Spring11-PU-S3-START311-V1G1-v1/AODSIM•/QCD-Pt-80to120-TuneZ2-7TeV-pythia6/Spring11-PU-S3-START311-V1G1-v1/AODSIM•/QCD-Pt-120to170-TuneZ2-7TeV-pythia6/Spring11-PU-S3-START311-V1G1-v1/AODSIM•/QCD-Pt-170to300-TuneZ2-7TeV-pythia6/Spring11-PU-S3-START311-V1G1-v1/AODSIM•/QCD-Pt-300to470-TuneZ2-7TeV-pythia6/Spring11-PU-S3-START311-V1G1-v1/AODSIM•/QCD-Pt-470to600-TuneZ2-7TeV-pythia6/Spring11-PU-S3-START311-V1G1-v1/AODSIM
•/QCD-Pt-600to800-TuneZ2-7TeV-pythia6/Spring11-PU-S3-START311-V1G1-v1/AODSIM
Sanmay Ganguly Department Of High Energy Physics Tata Institute Of Fundamental Research ()Jet Study In CMS Detector June 7, 2011 12 / 51
The Data and MC samples
The MC samples taken for study :•/QCDPt-50to80-TuneZ2-7TeV-pythia6/Spring11-PU-S3-START311-V1G1-v1/AODSIM•/QCD-Pt-80to120-TuneZ2-7TeV-pythia6/Spring11-PU-S3-START311-V1G1-v1/AODSIM•/QCD-Pt-120to170-TuneZ2-7TeV-pythia6/Spring11-PU-S3-START311-V1G1-v1/AODSIM•/QCD-Pt-170to300-TuneZ2-7TeV-pythia6/Spring11-PU-S3-START311-V1G1-v1/AODSIM•/QCD-Pt-300to470-TuneZ2-7TeV-pythia6/Spring11-PU-S3-START311-V1G1-v1/AODSIM•/QCD-Pt-470to600-TuneZ2-7TeV-pythia6/Spring11-PU-S3-START311-V1G1-v1/AODSIM•/QCD-Pt-600to800-TuneZ2-7TeV-pythia6/Spring11-PU-S3-START311-V1G1-v1/AODSIM
Sanmay Ganguly Department Of High Energy Physics Tata Institute Of Fundamental Research ()Jet Study In CMS Detector June 7, 2011 12 / 51
The Data and MC samples
continued ..
•/QCD-Pt-800to1000-TuneZ2-7TeV-pythia6/Spring11-PU-S3-START311-V1G1-v1/AODSIM•/QCD-Pt-1000to1400-TuneZ2-7TeV-pythia6/Spring11-PU-S3-START311-V1G1-v1/AODSIM•/QCD-Pt-1400to1800-TuneZ2-7TeV-pythia6/Spring11-PU-S3-START311-V1G1-v1/AODSIM•/QCD-Pt-1800-TuneZ2-7TeV-pythia6/Spring11-PU-S3-START311-V1G1-v1/AODSIM
Dataset:/Jet/Run2011A-PromptReco-v2/AOD
Sanmay Ganguly Department Of High Energy Physics Tata Institute Of Fundamental Research ()Jet Study In CMS Detector June 7, 2011 13 / 51
The Data and MC samples
continued ..•/QCD-Pt-800to1000-TuneZ2-7TeV-pythia6/Spring11-PU-S3-START311-V1G1-v1/AODSIM
•/QCD-Pt-1000to1400-TuneZ2-7TeV-pythia6/Spring11-PU-S3-START311-V1G1-v1/AODSIM•/QCD-Pt-1400to1800-TuneZ2-7TeV-pythia6/Spring11-PU-S3-START311-V1G1-v1/AODSIM•/QCD-Pt-1800-TuneZ2-7TeV-pythia6/Spring11-PU-S3-START311-V1G1-v1/AODSIM
Dataset:/Jet/Run2011A-PromptReco-v2/AOD
Sanmay Ganguly Department Of High Energy Physics Tata Institute Of Fundamental Research ()Jet Study In CMS Detector June 7, 2011 13 / 51
The Data and MC samples
continued ..•/QCD-Pt-800to1000-TuneZ2-7TeV-pythia6/Spring11-PU-S3-START311-V1G1-v1/AODSIM•/QCD-Pt-1000to1400-TuneZ2-7TeV-pythia6/Spring11-PU-S3-START311-V1G1-v1/AODSIM
•/QCD-Pt-1400to1800-TuneZ2-7TeV-pythia6/Spring11-PU-S3-START311-V1G1-v1/AODSIM•/QCD-Pt-1800-TuneZ2-7TeV-pythia6/Spring11-PU-S3-START311-V1G1-v1/AODSIM
Dataset:/Jet/Run2011A-PromptReco-v2/AOD
Sanmay Ganguly Department Of High Energy Physics Tata Institute Of Fundamental Research ()Jet Study In CMS Detector June 7, 2011 13 / 51
The Data and MC samples
continued ..•/QCD-Pt-800to1000-TuneZ2-7TeV-pythia6/Spring11-PU-S3-START311-V1G1-v1/AODSIM•/QCD-Pt-1000to1400-TuneZ2-7TeV-pythia6/Spring11-PU-S3-START311-V1G1-v1/AODSIM•/QCD-Pt-1400to1800-TuneZ2-7TeV-pythia6/Spring11-PU-S3-START311-V1G1-v1/AODSIM
•/QCD-Pt-1800-TuneZ2-7TeV-pythia6/Spring11-PU-S3-START311-V1G1-v1/AODSIM
Dataset:/Jet/Run2011A-PromptReco-v2/AOD
Sanmay Ganguly Department Of High Energy Physics Tata Institute Of Fundamental Research ()Jet Study In CMS Detector June 7, 2011 13 / 51
The Data and MC samples
continued ..•/QCD-Pt-800to1000-TuneZ2-7TeV-pythia6/Spring11-PU-S3-START311-V1G1-v1/AODSIM•/QCD-Pt-1000to1400-TuneZ2-7TeV-pythia6/Spring11-PU-S3-START311-V1G1-v1/AODSIM•/QCD-Pt-1400to1800-TuneZ2-7TeV-pythia6/Spring11-PU-S3-START311-V1G1-v1/AODSIM•/QCD-Pt-1800-TuneZ2-7TeV-pythia6/Spring11-PU-S3-START311-V1G1-v1/AODSIM
Dataset:/Jet/Run2011A-PromptReco-v2/AOD
Sanmay Ganguly Department Of High Energy Physics Tata Institute Of Fundamental Research ()Jet Study In CMS Detector June 7, 2011 13 / 51
ET of 1st-Calo-Jet-MC p̂T ≤ 170 GeV
of 1st Jet(GeV)TE0 200 400 600 800 1000
)-1
(GeV
)T
d(Ed
N
1
10
210
310
410
510
610
710
810
genjet-1
calojet-1
calojet-corrected-1
ET Distribution of 1st CaloJet
Sanmay Ganguly Department Of High Energy Physics Tata Institute Of Fundamental Research ()Jet Study In CMS Detector June 7, 2011 14 / 51
ET of 1st-Calo-Jet-MC p̂T ≥ 170 GeV
of 1st Jet(GeV)TE0 200 400 600 800 100012001400160018002000
)-1
(GeV
)T
d(Ed
N
1
10
210
310
410
genjet-1
calojet-1
calojet-corrected-1
ET Distribution of 1st CaloJet
Sanmay Ganguly Department Of High Energy Physics Tata Institute Of Fundamental Research ()Jet Study In CMS Detector June 7, 2011 15 / 51
ET of 2nd-Calo-Jet-MC p̂T ≤ 170 GeV
of 2nd Jet(GeV)TE0 200 400 600 800 1000
)-1
(GeV
)T
d(Ed
N
1
10
210
310
410
510
610
710
810
910 genjet-2
calojet-2
calojet-corrected-2
ET Distribution of 2nd CaloJet
Sanmay Ganguly Department Of High Energy Physics Tata Institute Of Fundamental Research ()Jet Study In CMS Detector June 7, 2011 16 / 51
ET of 2nd-Calo-Jet-MC p̂T ≥ 170 GeV
of 2nd Jet(GeV)TE0 200 400 600 800 100012001400160018002000
)-1
(GeV
)T
d(Ed
N
1
10
210
310
410
genjet-2
calojet-2
calojet-corrected-2
ET Distribution of 2nd CaloJet
Sanmay Ganguly Department Of High Energy Physics Tata Institute Of Fundamental Research ()Jet Study In CMS Detector June 7, 2011 17 / 51
η of 1st-Calo-Jet-MC p̂T ≤ 170 GeV
of 1st Jetη-5 -4 -3 -2 -1 0 1 2 3 4 5
)ηd
(dN
0
10
20
30
40
50
610×genjet-1
calojet-1
calojet-corrected-1
η Distribution of 1st CaloJet
Sanmay Ganguly Department Of High Energy Physics Tata Institute Of Fundamental Research ()Jet Study In CMS Detector June 7, 2011 18 / 51
η of 1st-Calo-Jet-MC p̂T ≥ 170 GeV
of 1st Jetη-5 -4 -3 -2 -1 0 1 2 3 4 5
)ηd
(dN
0
2000
4000
6000
8000
10000
12000
14000
16000genjet-1
calojet-1
calojet-corrected-1
η Distribution of 1st CaloJet
Sanmay Ganguly Department Of High Energy Physics Tata Institute Of Fundamental Research ()Jet Study In CMS Detector June 7, 2011 19 / 51
η of 2nd-Calo-Jet-MC p̂T ≤ 170 GeV
of 2nd Jetη-5 -4 -3 -2 -1 0 1 2 3 4 5
ηddN
0
10
20
30
40
50
60
610×genjet-2
calojet-2
calojet-corrected-2
η Distribution of 2nd CaloJet
Sanmay Ganguly Department Of High Energy Physics Tata Institute Of Fundamental Research ()Jet Study In CMS Detector June 7, 2011 20 / 51
η of 2nd-Calo-Jet-MC p̂T ≥ 170 GeV
of 2nd Jetη-5 -4 -3 -2 -1 0 1 2 3 4 5
ηddN
0
2000
4000
6000
8000
10000
12000
14000
16000genjet-2
calojet-2
calojet-corrected-2
η Distribution of 2nd CaloJet
Sanmay Ganguly Department Of High Energy Physics Tata Institute Of Fundamental Research ()Jet Study In CMS Detector June 7, 2011 21 / 51
ET of 1st-PF-Jet-MC p̂T ≤ 170 GeV
ET of 1st Jet(GeV)0 200 400 600 800 1000
)-1
(GeV
)T
d(Ed
N
1
10
210
310
410
510
610
710
810
genjet-1
pfjet-1
pfjet-corrected-1
ET Distribution of 1st PFJet
Sanmay Ganguly Department Of High Energy Physics Tata Institute Of Fundamental Research ()Jet Study In CMS Detector June 7, 2011 22 / 51
ET of 1st-PF-Jet-MC p̂T ≥ 170 GeV
ET of 1st Jet(GeV)0 200 400 600 800 100012001400160018002000
)-1
(GeV
)T
d(Ed
N
1
10
210
310
410
genjet-1
pfjet-1
pfjet-corrected-1
ET Distribution of 1st PFJet
Sanmay Ganguly Department Of High Energy Physics Tata Institute Of Fundamental Research ()Jet Study In CMS Detector June 7, 2011 23 / 51
ET of 2nd-PF-Jet-MC p̂T ≤ 170 GeV
ET of 2nd Jet(GeV)0 200 400 600 800 1000
)-1
(GeV
)T
d(Ed
N
1
10
210
310
410
510
610
710
810
genjet-2
pfjet-2
pfjet-corrected-2
ET Distribution of 2nd PFJet
Sanmay Ganguly Department Of High Energy Physics Tata Institute Of Fundamental Research ()Jet Study In CMS Detector June 7, 2011 24 / 51
ET of 2nd-PF-Jet-MC p̂T ≥ 170 GeV
ET of 2nd Jet(GeV)0 200 400 600 800 100012001400160018002000
)-1
(GeV
)T
d(Ed
N
1
10
210
310
410
genjet-2
pfjet-2
pfjet-corrected-2
ET Distribution of 2nd PFJet
Sanmay Ganguly Department Of High Energy Physics Tata Institute Of Fundamental Research ()Jet Study In CMS Detector June 7, 2011 25 / 51
η of 1st-PF-Jet-MC p̂T ≤ 170 GeV
of 1st Jet(GeV)η-5 -4 -3 -2 -1 0 1 2 3 4 5
ηddN
0
10
20
30
40
50
60
70
610×genjet-1
pfjet-1
pfjet-corrected-1
η Distribution of 1st PFJet
Sanmay Ganguly Department Of High Energy Physics Tata Institute Of Fundamental Research ()Jet Study In CMS Detector June 7, 2011 26 / 51
η of 1st-PF-Jet-MC p̂T ≥ 170 GeV
of 1st Jet(GeV)η-5 -4 -3 -2 -1 0 1 2 3 4 5
ηddN
0
2000
4000
6000
8000
10000
12000
14000
16000genjet-1
pfjet-1
pfjet-corrected-1
η Distribution of 1st PFJet
Sanmay Ganguly Department Of High Energy Physics Tata Institute Of Fundamental Research ()Jet Study In CMS Detector June 7, 2011 27 / 51
η of 2nd-PF-Jet-MC p̂T ≤ 170 GeV
of 2nd Jetη-5 -4 -3 -2 -1 0 1 2 3 4 5
ηddN
0
10
20
30
40
50
60
70
610×genjet-2
pfjet-2
pfjet-corrected-2
η Distribution of 2nd PFJet
Sanmay Ganguly Department Of High Energy Physics Tata Institute Of Fundamental Research ()Jet Study In CMS Detector June 7, 2011 28 / 51
η of 2nd-PF-Jet-MC p̂T ≥ 170 GeV
of 2nd Jetη-5 -4 -3 -2 -1 0 1 2 3 4 5
ηddN
0
2000
4000
6000
8000
10000
12000
14000
16000genjet-2
pfjet-2
pfjet-corrected-2
η Distribution of 2nd PFJet
Sanmay Ganguly Department Of High Energy Physics Tata Institute Of Fundamental Research ()Jet Study In CMS Detector June 7, 2011 29 / 51
MDijet-MC p̂T ≤ 170 GeV
MDijet(GeV)0 200 400 600 800 100012001400160018002000
-1(G
eV)
d(M
Dije
t)d
N
0
20
40
60
80
100
610×dijetmass-gen
dijetmass-calo
dijetmass-pf
Dijet Invariant Mass Of Two Leading Jets
Sanmay Ganguly Department Of High Energy Physics Tata Institute Of Fundamental Research ()Jet Study In CMS Detector June 7, 2011 30 / 51
Φ Difference-MC p̂T ≤ 170 GeV
φ ∆0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
)φ ∆d
(dN
0
20
40
60
80
100
120
610×φ ∆φ ∆φ ∆
Azimuthal Angle Between Two Leading Jets
Sanmay Ganguly Department Of High Energy Physics Tata Institute Of Fundamental Research ()Jet Study In CMS Detector June 7, 2011 31 / 51
Φ Difference-MC p̂T ≥ 170 GeV
φ ∆0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
)φ ∆d
(dN
0
5000
10000
15000
20000
25000
30000
35000
40000
45000φ ∆φ ∆φ ∆
Azimuthal Angle Between Two Leading Jets
Sanmay Ganguly Department Of High Energy Physics Tata Institute Of Fundamental Research ()Jet Study In CMS Detector June 7, 2011 32 / 51
Comparison Of Jets p̂T ≤ 170 GeV
0 200 400 600 800 10000
100
200
300
400
500
600
610×1st Gen-Jet
1st Calo-Jet Corrected
1st PF-Jet Corrected
-5 -4 -3 -2 -1 0 1 2 3 4 50
10
20
30
40
50
60
610×1st Gen-Jet
1st Calo-Jet Corrected
1st PF-Jet Corrected
0 200 400 600 800 10000
100
200
300
400
500
600
700
610×2nd Gen-Jet
2nd Calo-Jet Corrected
2nd PF-Jet Corrected
-5 -4 -3 -2 -1 0 1 2 3 4 50
10
20
30
40
50
60
610×2nd Gen-Jet
2nd Calo-Jet Corrected
2nd PF-Jet Corrected
ET and η Comparison Of Gen-Calo-PF Jets
Sanmay Ganguly Department Of High Energy Physics Tata Institute Of Fundamental Research ()Jet Study In CMS Detector June 7, 2011 33 / 51
Comparison Of Jets p̂T ≥ 170 GeV
ET of 1st Jet(GeV)0 200 400 600 800 1000
)-1
(GeV
)T
d(Ed
N
5000
10000
15000
20000
25000
30000
35000
1st Gen-Jet
1st Calo-Jet Corrected
1st PF-Jet Corrected
of 1st Jet(GeV)η-5 -4 -3 -2 -1 0 1 2 3 4 5
ηddN
0
2000
4000
6000
8000
10000
12000
14000
16000
1st Gen-Jet
1st Calo-Jet Corrected
1st PF-Jet Corrected
ET of 2nd Jet(GeV)0 200 400 600 800 1000
)-1
(GeV
)T
d(Ed
N
5000
10000
15000
20000
25000
30000
35000 2nd Gen-Jet
2nd Calo-Jet Corrected
2nd PF-Jet Corrected
of 2nd Jetη-5 -4 -3 -2 -1 0 1 2 3 4 5
ηddN
0
2000
4000
6000
8000
10000
12000
14000
160002nd Gen-Jet
2nd Calo-Jet Corrected
2nd PF-Jet Corrected
ET and η Comparison Of Gen-Calo-PF Jets
Sanmay Ganguly Department Of High Energy Physics Tata Institute Of Fundamental Research ()Jet Study In CMS Detector June 7, 2011 34 / 51
Calojet Response
ptbin(GeV)0 200 400 600 800 1000 1200 1400 1600 1800 2000
-rat
ioT
E
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
2
Graph
|<1.3η1st-Calo |
Graph
ptbin(GeV)0 200 400 600 800 1000 1200 1400 1600 1800 2000
-rat
ioT
E
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
2
Graph
|<1.3η2nd-Calo |
Graph
ptbin(GeV)0 200 400 600 800 1000 1200 1400 1600 1800 2000
-rat
ioT
E
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
2
Graph
|>1.3η1st-Calo |
Graph
ptbin(GeV)0 200 400 600 800 1000 1200 1400 1600 1800 2000
-rat
ioT
E
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
2
Graph
|>1.3η2st-Calo |
Graph
Jet Response For CaloJetsSanmay Ganguly Department Of High Energy Physics Tata Institute Of Fundamental Research ()Jet Study In CMS Detector June 7, 2011 35 / 51
Trigger Turn On Curve
0 50 100 150 200 2500
0.2
0.4
0.6
0.8
1
Sanmay Ganguly Department Of High Energy Physics Tata Institute Of Fundamental Research ()Jet Study In CMS Detector June 7, 2011 36 / 51
Measurement of αs
Our current physics goal is to measure the value of strong couplingconstant αs from 2010 and 2011 data.
We plan to study the inclusive jet ET spectrum and extract the valueof αs .
The basic equation for extracting αs isdσ
dET= α2
s (µR)X̂ (0)(µF ,ET )[1 + αs(µR)k1(µR , µF ,ET )]
dσdET
is the transverse energy distribution of the inclusive jets.
µR , µF ,related to ET by a scale factor,are the renormalization andfactorization scale respectively.
α2s (µR)X̂ (0)(µF ,ET ) is the leading order(LO) prediction of the
inclusive jet cross section and α3s (µR)X̂ (0)(µF ,ET )k1(µR , µF ,ET ) is
the next to leading order(NLO) prediction.
Sanmay Ganguly Department Of High Energy Physics Tata Institute Of Fundamental Research ()Jet Study In CMS Detector June 7, 2011 37 / 51
Plots From CDF
Sanmay Ganguly Department Of High Energy Physics Tata Institute Of Fundamental Research ()Jet Study In CMS Detector June 7, 2011 38 / 51
Plans...
We will also carry out the same exercise from different MC(both LOand NLO) and try to fit the observed running of αs
The effect due to pile-up and angulur resolution is going to be studied.
The analysis is going to be done for both high and low pt bins
Data driven study is going to be made for Jet Energy Response usingγ+Jet and Z+jet events.
We will also carry out the same exercise from different MC(both LOand NLO) and try to fit the observed running of αs
Sanmay Ganguly Department Of High Energy Physics Tata Institute Of Fundamental Research ()Jet Study In CMS Detector June 7, 2011 39 / 51
Acknowledgement
I thank Seema Sharma,Anirban Saha,Devdutta Mazumdar andRajdeep Chatterjee for helpful discussion over several times.
Sanmay Ganguly Department Of High Energy Physics Tata Institute Of Fundamental Research ()Jet Study In CMS Detector June 7, 2011 40 / 51
PFjet Response
ptbin(GeV)0 200 400 600 800 1000 1200 1400 1600 1800 2000
-rat
ioT
E
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
2
Graph
|<1.3η1st-PF |
Graph
ptbin(GeV)0 200 400 600 800 1000 1200 1400 1600 1800 2000
-rat
ioT
E
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
2
Graph
|<1.3η2nd-PF |
Graph
ptbin(GeV)0 200 400 600 800 1000 1200 1400 1600 1800 2000
-rat
ioT
E
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
2
Graph
|>1.3η1st-PF |
Graph
ptbin(GeV)0 200 400 600 800 1000 1200 1400 1600 1800 2000
-rat
ioT
E
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
2
Graph
|>1.3η2nd-PF |
Graph
Jet Response For PFJetsSanmay Ganguly Department Of High Energy Physics Tata Institute Of Fundamental Research ()Jet Study In CMS Detector June 7, 2011 41 / 51
ET of 1st-Calo-Jet-Data
of 1st Jet(GeV)TE0 50 100 150 200 250 300 350 400 450 500
)-1
(GeV
)T
d(Ed
N
0
20
40
60
80
100
120
140
160
180
200310×
calojet-1
calojet-corrected-1
ET Distribution of 1st CaloJet
Sanmay Ganguly Department Of High Energy Physics Tata Institute Of Fundamental Research ()Jet Study In CMS Detector June 7, 2011 42 / 51
ET of 2nd-Calo-Jet-Data
ET of 2nd Jet(GeV)0 50 100 150 200 250 300 350 400 450 500
)-1
(GeV
)T
d(Ed
N
0
20
40
60
80
100
120
140
160
180
200
220
240
310×calojet-2
calojet-corrected-2
ET Distribution of 2nd CaloJet
Sanmay Ganguly Department Of High Energy Physics Tata Institute Of Fundamental Research ()Jet Study In CMS Detector June 7, 2011 43 / 51
η of 1st-Calo-Jet-Data
of 1st Jetη-5 -4 -3 -2 -1 0 1 2 3 4 5
)ηd
(dN
0
50
100
150
200
250
300
310×calojet-1
calojet-corrected-1
η Distribution of 1st CaloJet
Sanmay Ganguly Department Of High Energy Physics Tata Institute Of Fundamental Research ()Jet Study In CMS Detector June 7, 2011 44 / 51
η of 2nd-Calo-Jet-Data
of 2nd Jetη-5 -4 -3 -2 -1 0 1 2 3 4 5
ηddN
0
50
100
150
200
250
300
310×calojet-2
calojet-corrected-2
η Distribution of 2nd CaloJet
Sanmay Ganguly Department Of High Energy Physics Tata Institute Of Fundamental Research ()Jet Study In CMS Detector June 7, 2011 45 / 51
ET of 1st-PF-Jet-Data
ET of 1st Jet(GeV)0 50 100 150 200 250 300 350 400 450 500
)-1
(GeV
)T
d(Ed
N
0
20
40
60
80
100
120
140
310×pfjet-1
pfjet-corrected-1
ET Distribution of 1st PFJet
Sanmay Ganguly Department Of High Energy Physics Tata Institute Of Fundamental Research ()Jet Study In CMS Detector June 7, 2011 46 / 51
ET of 2nd-PF-Jet-Data
)-1(GeV)
Td(EdN0 50 100 150 200 250 300 350 400 450 5000
20
40
60
80
100
120
140
160
180
200
310×pfjet-2
pfjet-corrected-2
ET Distribution of 2nd PFJet
Sanmay Ganguly Department Of High Energy Physics Tata Institute Of Fundamental Research ()Jet Study In CMS Detector June 7, 2011 47 / 51
η of 1st-PF-Jet-Data
of 1st Jetη-5 -4 -3 -2 -1 0 1 2 3 4 5
ηddN
0
50
100
150
200
250
300
310×pfjet-1
pfjet-corrected-1
η Distribution of 1st PFJet
Sanmay Ganguly Department Of High Energy Physics Tata Institute Of Fundamental Research ()Jet Study In CMS Detector June 7, 2011 48 / 51
η of 2nd-PF-Jet-Data
of 2nd Jetη-5 -4 -3 -2 -1 0 1 2 3 4 5
ηddN
0
50
100
150
200
250
300
310×pfjet-1
pfjet-corrected-2
η Distribution of 2nd PFJet
Sanmay Ganguly Department Of High Energy Physics Tata Institute Of Fundamental Research ()Jet Study In CMS Detector June 7, 2011 49 / 51
MDijet-Data
MDijet(GeV)0 200 400 600 800 100012001400160018002000
-1(G
eV)
d(M
Dije
t)d
N
0
50
100
150
200
250
310×
dijetmass-calo
MDijet(Gev)0 200 400 600 800 100012001400160018002000
-1(G
eV)
d(M
Dije
t)d
N
0
20
40
60
80
100
120
140
310×
dijetmass-pf
Dijet Invariant Mass Of Two Leading JetsSanmay Ganguly Department Of High Energy Physics Tata Institute Of Fundamental Research ()Jet Study In CMS Detector June 7, 2011 50 / 51
Φ Difference-Data
φ ∆0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
)φ ∆d
(dN
0
100
200
300
400
500
600
700
310×
φ ∆
φ ∆0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
)φ ∆d
(dN
0
20
40
60
80
100
120
140
160
180
310×
φ ∆
Azimuthal Angle Between Two Leading JetsSanmay Ganguly Department Of High Energy Physics Tata Institute Of Fundamental Research ()Jet Study In CMS Detector June 7, 2011 51 / 51