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

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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

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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

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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

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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

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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

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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)

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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

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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

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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

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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

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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