Kristin Kamon Miller 504 Plans POCHA of Will County June 8, 2009.
Physics (status and plans)people.physics.tamu.edu/kamon/research/CMS/CMS... · D.D’Enterria...
Transcript of Physics (status and plans)people.physics.tamu.edu/kamon/research/CMS/CMS... · D.D’Enterria...
December 10, 2007CMS week -- collaboration meeting
1P. SphicasPhysics (status and plans)
Physics (status and plans)
Outline
News/updatephysics organization
analysis approval system
events/other actions since last CMS week
Physics objects: status
Physics analyses: examples
Planning, schedule
P.SphicasCMS week
December 10, 2007
News/update
December 10, 2007CMS week -- collaboration meeting
3P. SphicasPhysics (status and plans)
CMS physics organization (from Jan 2008)
Physics CoordinatorP.SphicasDeputies:
J.Incandela, R.Tenchini
MC generatorsP.BartaliniR.Chierici
HiggsC.MariottiY.Sirois
SUSYO.Buchmuller
L.Pape
EWKJ.AlcarazS.Dasu
B physicsU.Langenegger
J.Olsen
b-taggingT.Speer
T.Boccali
Jets/MissETG.Dissertori
D.Elvira
MuonsN.AmapaneM.Mulders
e/γC.Seez
P.Vanlaer
ParticleFlow/τR.Cavanaugh
P.Janot
Forward PhysicsM.Grothe
Heavy IonsD.D’EnterriaO.Kodolova
Super LHCD.Denegri
QCDK.RabbertzN.Varelas
TopC.Campagnari
J.D’Hondt
ExoticsA.De Roeck
S.Eno
December 10, 2007CMS week -- collaboration meeting
4P. SphicasPhysics (status and plans)
New physics organizationSUSY-BSM group split into “SUSY” and “Exotica”
Scope of SUSY-BSM group was far too large for a single groupDivision of topics not strictly thematic:SUSY includes “traditional” SUSY signatures with ETmiss; plus Universal Extra Dimensions, plus Little-Higgs models (with T-parity)Exotica includes remaining SUSY signatures (heavy stable charged particle, GMSB, R-parity violating SUSY)
and the remaining models Beyond the Standard Model
Diffractive physics group renamed to “Forward Physics”
Better reflect actual scope of the group’s activitiesA second convener will now be sought (given enlarged scope)
December 10, 2007CMS week -- collaboration meeting
5P. SphicasPhysics (status and plans)
New analysis approval system (I)Starts this week; linked to new constitution (on publications)
Analysis Review Committee (ARC): ≥3 people, one from pub comm, one from “inside” group, one from collaboration at large
Appointed by Phys Coordinator and Pub Comm chairPre-approval in physics group: documentation must be available at least one week before pre-approval meeting
Standardized physics object ID must be applied in analysisusage of “standard objects” by an analysis constitutes “approval by default”. If an analysis makes changes to this, the code must go into CVS repository and get POG approval
After pre-approval: ARC decides whether to recommend (or not) proceeding with approval. Decision by phys coordinator.Subsequently: all documentation (Analysis Notes and PAS Web Page) frozen
Approval meeting announced two weeks ahead (full physics list)What gets approved: contents of PAS (Web) page.
PAS: 4-5 page summary with all relevant numbers and plots to be approved. Backed by one or more Analysis Notes.
Becomes public after approval.
December 10, 2007CMS week -- collaboration meeting
6P. SphicasPhysics (status and plans)
New analysis approval system (II)
CMS Analysis Database (CAD)Holds all CMS physics analyses and relevant information
Contact people, Working group, links to Analysis Notes, PAS page, status (started, pre-app, scheduled for approval, etc), ARC, comments, etc
CMS Analysis Database Interface (CADI)Via iCMS: REQUIRES AFS (CMS) account
Log into iCMS (as normally). Access on left pane as “CADI”http://cms.cern.ch/iCMS/analysisadmin/analysismanagement
Thanks to Dirk Samyn (CERN, PH/CMC) for CAD/CADI
Instructions for new approval system on iCMS (Physics page Documents Approval procedure)
New system being field-tested using 2007 analyses.
December 10, 2007CMS week -- collaboration meeting
7P. SphicasPhysics (status and plans)
Group on Analysis Software/AOD (I)PAGs (& also individuals): parallel and non-overlapping efforts towards a Physics Analysis Toolkit/Framework (PAT).
TQAF, SusyAnalyser, SusyTools, … diverging because of lack of coordinated common base for a CMS-wide PAT. Substantial, unnecessary duplication of work; user confusion
Analysis beginners (majority of CMS physicists at this point in time) do not know where to start from in setting up their analysis
Analysis of (first) data: without a unified PAT, analyses rely heavily on experts from various groups;
unnecessary delays between data taking and running of the analyses. Such delays will slow down tracking potential problems with the detector, the reconstruction chain, the analysis programs; could have very negative impact on our competitiveness
December 10, 2007CMS week -- collaboration meeting
8P. SphicasPhysics (status and plans)
Group on Analysis Software/AOD (II)
Related issue: AOD content. AOD is the primary data format distributed to all the Tier-1 centers of CMS, i.e. should be most widely used input to physics analyses.
At present: AOD size too large with respect to original plans.
Furthermore, we know neither whether this oversize is justified by physics needs nor whether the current content is adequate for “doing physics”.
A new group has been formed to tackle these two related issues
Chaired by Roberto Tenchini; open meetings: include representatives from Offline and physics groups
First report at dedicated workshop on Mon-Tue Jan 28-29 (right after Jan Physics Days to facilitate travel)
December 10, 2007CMS week -- collaboration meeting
9P. SphicasPhysics (status and plans)
Physics/Trigger week (end October)
First half of the week: working group meetings.
Plenary Joint Physics-Trigger meeting on Wed;focused on activities of the new Trigger Studies Group (TSG) and trigger monitoring.
Both Physics and Trigger organizations now focused on readiness for early data-taking. Emphasis was on early trigger tables, preparations for calibrations and monitoring of trigger performance for fast feedback in early LHC running
Remainder of the week: devoted to plenary sessions covering the 2007 Analyses
In particular, plans for producing analysis notes on physics that can be accessed in 100 pb-1 or 10 pb-1 as may be obtained in the startup run of the LHC.
December 10, 2007CMS week -- collaboration meeting
10P. SphicasPhysics (status and plans)
CSA07 and physicsMain Tier-0 output: ~150 Mevt
100pb-1 of data (not quite, e.g. not enough QCD jets)Reconstruct with calibration/alignment constants corresponding to “detector knowledge with 10pb-1 of data”
Tier-0 production ~200Mevt, have another 50Mevt to useAdd “10pb-1 of data”; reconstruct with startup calib/align precision
AOD crated and distributed to (all/multiple) Tier-1sRun skim jobs on AOD at Tier-1’s
Test re-reconstruction at Tier-1Same data, so this time run with 100pb-1 constants
At Tier-2’s: monitor incoming skim data; check/validateIn parallel: run on older samples (for 2007 analyses).
All analyses must migrate to Tier-2s. Note this is mimicking life (typically full analysis runs on data “version-1”.
Generate 50 Mevt Monte Carlo eventsCAF: first tests (data, code, organization) of “Express Line”
Three analyses: W/Z, Higgs and Z′. Would be nice to also inject signals (that go to the primary datasets at the Tier-2s as well). Currently in planning phase…
December 10, 2007CMS week -- collaboration meeting
11P. SphicasPhysics (status and plans)
Physics plan and CSA07
The truth is we have been hurt by lack of dataWhen CSA07 was moved from Jun to Oct 07, it became apparent that only the early Spring07 data (CMSSW_1_3) could really be used for physics analyses.
Later, the excess production capacity was used to RECO the CSA07 data with CMSSW_1_5 ahead of time.
But no HLT in 1_5; also, perfect detector calibr/alignment
These data became available in September
Incompatible with 1_3 (e.g. geometry).
Further delays in the skimming made the CSA07 data available in mid November (beginning of appearance)
So impossible to use these samples
Most of what follows today is the result of work with 1_3 and 1_5 samples…
Physics Objects
Recent progress in physics objects
December 10, 2007CMS week -- collaboration meeting
13P. SphicasPhysics (status and plans)
Physics Objects
Recall status at last CMS week: Current focus of work: definition of standard physics objects for “2007 analyses” and “CSA07 analyses”
By now: reconstruction algorithms well established
But ongoing improvements: e.g. use of mixed seeding for electron tracks
Emphasis of work:
Methods for measuring efficiency and fake rate from data
Beyond October (based on CSA07 samples): need physics object ID for start-up:
robust and simple to understand/measure efficiency with data
December 10, 2007CMS week -- collaboration meeting
14P. SphicasPhysics (status and plans)
Electron Efficiency: Analysis NoteAN 2007/019: “Measuring Electron Efficiencies with Early Data”Tag + probe using Z→ee (C. Hill, G. Daskalakis, D. Evans, J. Jackson, J. Berryhill, J. Haupt, C. Timlin, D. Wardrope):
Tag electron defined using tight criteria. Z mass constraint used to identify a looser Probe electron - unbiased w.r.t efficiency to be measured.
Pre-approved at egamma POG meeting on Nov 12Approval presentation during physics plenary on FridayPAS: https://twiki.cern.ch/twiki/bin/view/CMS/TWikiTNPNote
Cumulative Efficiency(reconstruction, ID,isolation, trigger)
Electron trackreconstruction
efficiency
December 10, 2007CMS week -- collaboration meeting
15P. SphicasPhysics (status and plans)
Electron IdentificationNew cut-based electron ID now available (M. Sani, J. Branson, R. Salerno)
Includes a simple “robust” electron ID provided suitable for startup conditionsDocumentation, including instructions for use with 13X, 16X, 17X:https://twiki.cern.ch/twiki/bin/view/CMS/SWGuideElectronID
Reference performance plots (efficiency and fake rate from jets) provided here for PTDR electron ID (P. Ribeiro):
https://twiki.cern.ch/twiki/bin/view/CMS/ElectronPerformanceSimilar page for new electron ID will be available this week
Z→ee
No isolation
December 10, 2007CMS week -- collaboration meeting
16P. SphicasPhysics (status and plans)
Muon Efficiency with Tag & Probe
Tag-And-Probe using Z→µµProbe: different categories (Golden, Matched, Unmatched, Tracker-only, Standalone)
Efficiency tables as a function of η&pT produced
Good agreement with MC expectationsGUGMGG
GMGG
GSGUGMGG
GUGMGG
GTGUGMGG
GUGMGG
NNN
NN
NNNN
NNN
NNNN
NNN
+++
=
+++++
=
+++++
=
2
2
2
2
2
2
matching
acktracker tr
muon standalone
ε
ε
ε
Global MuonTracker Track
TAG µ
PROBE µ
December 10, 2007CMS week -- collaboration meeting
17P. SphicasPhysics (status and plans)
• pT correction as a function of muon kinematics (pT, η, φ, …) computed minimizing a likelihood
TWIKI page: https://twiki.cern.ch/twiki/bin/view/CMS/MuonScaleCalib
GLBMu
fit Lorentzian + decr. expo.
GLBMu
Muon Momentum Scale Calibration
• Modify muon pT to force the Z peak to be in the right position:
Tracker and Muon Syst. misaligned (10 pb-1 scenario)B field distortion
• Also biases from imprecise detector modeling considered:
December 10, 2007CMS week -- collaboration meeting
18P. SphicasPhysics (status and plans)
Fast Simulation of Muon Hits
• Fast simulated hits (SimHits) now availableCan be fed into standard digitization and reconstruction
A ttbar event with 3 muons, from fast simulation(2 stand-alone muon tracks reconstructed)
December 10, 2007CMS week -- collaboration meeting
19P. SphicasPhysics (status and plans)
First real HLT muons!
CosmicMuonReconstructor now producing the first real “Lvl-2” muons, on-line, in the filter farm
December 10, 2007CMS week -- collaboration meeting
20P. SphicasPhysics (status and plans)
S. Esen, G. LandsbergType I JES Corrections
Raw MET
True MET, GeV
MET: recent results
High pT ZK. Terashiµ Corrections
Texas A&M τ Corrections
•W(eν)+jets Corrected MET
December 10, 2007CMS week -- collaboration meeting
21P. SphicasPhysics (status and plans)
Measuring b-tag efficiency in data
Note on measuring b efficiency of lifetime-based b tags using data will be shown for approval on Friday. (C.Gerber et al)
Includes several methods, that exploit the small correlation between lifetime-based and b µ based b taggers.
Comparison of measured & true b tag efficiencies vs. jet Pt
Doesn’t show systematics of ~11%.
L ~ 14 pb-1
December 10, 2007CMS week -- collaboration meeting
22P. SphicasPhysics (status and plans)
Measuring uds-Jet mistag rate in Data
Lifetime-based b tags: exploit the fact that B decays produce several tracks with significant +ve impact parameters.
One can use tracks with –ve impact parameters to estimate from how often light quark jets are tagged in real data:
Analysis Note should be complete by Jan (D.Bloch et al.)
Precision is dominated by systematics from uncertainty in B hadron flight direction, dependence on jet selection/event type & contribution to light quark tag rate from V0 decays.
Better than 10% relative for “medium” b tag with only 10 pb-1 !
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December 10, 2007CMS week -- collaboration meeting
23P. SphicasPhysics (status and plans)
Primary Vertex Fitting
Primary vertex fit now uses measured beam-spot (BS) position, instead of (0,0,0). (W.Erdman, T.Speer)
Resolution transverse to beam improved by using beam constraint.
Equally good results when simulated beam is offset or tilted.
(9,16)(12, 17)140(500,250)
(9, 16)(12, 17)0(2000, 250)
(9, 16)(12, 16)0(0, 0)
With BS constraint
No BS constraint
Reconstructed primary vertex (x, z) resolution (µm)
Simulated beam
Tilt angle (µrads)
Simulated
BS
position
(x, y) (µm)
Vertex fit factor 2 faster due to change in matrix software (CLHEP SMatrix)
December 10, 2007CMS week -- collaboration meeting
24P. SphicasPhysics (status and plans)
P-flow: Jet Performance StudiesPF Jet Resolution
Significantly better than “raw”CaloJets for pT < 120 GeVImprovements for high pT Jets
See next page!
PF Jet ResponseSignificantly better response than “raw” CaloJetsApproaches 1.0 for pT > 100 GeV
Improvements still possible for low pT Jets
Focus work to improve high pT Jet Resolution
high densityhigh multiplicity
QCD dijets
PFJet ResponsePFJet Response
QCD dijets
J-L. Agram
J-L. Agram
December 10, 2007CMS week -- collaboration meeting
25P. SphicasPhysics (status and plans)
P-flow: recent algorithm Improvements at High pT
Improved separation of π0’s merged with charged hadrons
Before: γ’s from π0’s not separated from charged hadron
replaced by track lost energy
After: γ’ from π0’s identified and added to list of particles
Energy recovered Improved linking algorithm
Link track to cluster by Reco Hit associationRecover dispersed clusters
Before
After
500 GeV pT Jets
~10% improvementin resolution
Better jetresponse ∆ΕΤ/ΕΤ ∆ΕΤ/ΕΤ
∆ΕΤ/ΕΤ
200-500 GeV pT taus
200-500 GeV pT taus
Colin Bernet
Alex Zabi
December 10, 2007CMS week -- collaboration meeting
26P. SphicasPhysics (status and plans)
p-flow: MET corrections (with JetMET)
QCD Jet corrections to MET inappropriate for tau-jets
For every (PFjet, CaloJet) matched pair, calculate a correction
Swap calo energy in cone 0.5 with the PF calculation
Improved MET response
Improved MET resolutionFirst time in CMSSW!
)( τPFT
calojetTT EEE
rrr∑ −=/∆
Texas A&M Group: Alfredo Gurrola, et al
MET Resolution
τ-jets fromW(→τν) + 0jets
Status
Recent progress in physics analysisOnly a brief sketch here.
Note: numerous analyses will be presented at the Thursday and Friday plenary physics meetings for
approval
P. SphicasPhysics (status and plans)
Charged Hadron Spectra
Measurement of inclusive charged hadron production in pp collisions at 14 TeV;
scheduled for approval this week
Authors: F. Sikler, K. KrajczarARC: V. Chiochia, C. Lourenco,
F. Ambroglini
Algorithmic efficiency vs. transverse momentum for pions, kaons and protons
Comparison ofyields of chargedhadrons in rap. interval 0.4 – 0.6of simulation (hist.)and “data“ (symbols)
rel. deviation
AN 2007/021
December 10, 2007CMS week -- collaboration meeting
29P. SphicasPhysics (status and plans)
γ*/Z→ee : 3662 events
di-jets&γ*/Z→ττ&Wjets : 53 evts
W/Z decays to electrons, muons
10pb-1
70.0<Me,e<110.0 GeV
di-jetWjetsγ*/Z ττ
γ*/Z ee
Signal+Background
(D. Wardrope, M.Malberti)
(A. Vilela)
(S. Goy)
QCDW→µν
W→µν
Take MET from ZMumu. Use template method to estimate QCD background.
P. SphicasPhysics (status and plans)
Examples from Z→ττ decays
trigger: Iso Ele (12, 15 (L1,HLT)) Offline (main cuts):
Isolated electron (ET>16 GeV)Isolated taujet (ET>20 GeV)Electron veto
~138 events, ~50 bkg (mass 40-80 GeV/c2)
trigger: single, double leptonOffline (main cuts):
Isol. ele, mu (PT: 8, 7 GeV) cos Df>-0.1Vector (scalar) Pt sums < 120 (150) GeV/c
~700 events, background ~5.5% trigger: Iso Ele (12, 15 (L1,HLT))
Z−>ττ−>e+taujet (100pb-1)
emumasscut0Entries 2021Mean 37.31RMS 12.83
Invariant mass of leptons0 50 100 150 200 250 300 350 400 450 500
-1N
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ts/1
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emumasscut0Entries 2021Mean 37.31RMS 12.83
emumasscut0
signal
WW
tt
W + Jets
Z−>ττ−>e+mu+X (100pb-1)
(K. A. Petridis,S. Greder)
(S. Bansal,K. Mazumdar)
December 10, 2007CMS week -- collaboration meeting
31P. SphicasPhysics (status and plans)
IDEAL scenario, no PU Startup + PU
10 pb-1
Laura Ederaet al.
Top quark physicsσ~830pb (NLO) →very early physics; simple event selection:
At least four jets, ET > 30 GeV, |η| < 2.4One isolated muon (track<3, calo<5) , PT > 20 GeV, |η| < 2.4No other isolated lepton with PT > 10 GeV, |η| < 2.4
Jet combination which gives top quark with highest pT; among three jets require two in mW window
10 pb-1
December 10, 2007CMS week -- collaboration meeting
32P. SphicasPhysics (status and plans)
currently on top of the MCJet correctionsapplying a Likelihood Ratio method to establish the correct jet combinationsever event selection to select the cleanest and most useful eventsmethod proven to be not sensitive to combinatorial and process backgroundmethod proven not to be biased
After pull correction: δ100/pb (∆E) ~0.6%
2σ contour
∆E(heavy)=-2.6 ± 1.2%
∆E(light)=-11.3 ± 1.2%
Petra Van Mulders
Jet Energy Scale from top events100 pb-1: obtain light and heavy quark residual Jet Energy Scale corrections via mW and mtop constraints in top quark events
This by applying an event-by-event kinematic fit
Dec 18: pre-approval of 5 top quark notes:early measurements, cross section, mttbar distribution, JES from top, flavour tagging performance from top
CMS Plenary - 21/06/200733
P. SphicasPhysics (status and plans)
Natasha Ilina
Manuel Zeise
ττ→ll
ττ→l jet
2007 Analysis
H→ττ: Z→ττ bkg (shape) from data
December 10, 2007CMS week -- collaboration meeting
34P. SphicasPhysics (status and plans)
SUSY: some (trigger) benchmarks
LM1
efficiency
Texas A&M: Tau+MET Trigger
HL
T B
and
wid
th
L1 Bandw
idth
Brown: e+jet Trigger Optimization
QCD rate
D. Mangeol: Acoplanar Jet Triggers
Planning & physics schedule
December 10, 2007CMS week -- collaboration meeting
36P. SphicasPhysics (status and plans)
Broad-brush plan (I)“2008 papers”: we identified (early 2007) all the physics we will be doing in 2008 (if we were to get up to 1fb-1).
A long list
We split the time between “Physics-Org T0” and “LHC start” into two equal-time periods
So, starting in Feb 07, mid-point is ~Oct-Nov 07
“2007 analyses”: the subset of “2008 papers” that needs to be worked on already now, until Oct/Nov 07
Identified small number (2-6) topics per physics groupConcentrate all efforts on making these analyses as realistic aspossible
For each group, picked one analysis and currently walking through full analysis approval & pub committee procedure.
As soon as we finish this exercise, we will turn to the preparation for the arrival of collision data
December 10, 2007CMS week -- collaboration meeting
37P. SphicasPhysics (status and plans)
Broad-brush plan (II)Dec 07 to May 08: prepare for real data. Goals:
Define all physics datasets and streamsEspecially Express Line
Have all of the HLT code in place (POGs; PAG tests)Have all the trigger monitoring system (code + people) in placeHave all the data-analysis organization (code + people) in place
For each physics group, well-defined data- and work-flow, from Tier-0 to Tier-1 to Tier-2
Have analyses geared for 10 pb-1 and 100 pb-1 ready to absorb the data; complete plans for up to 1000pb-1.
Complete the 2007 analyses, injecting even more realism (noise, dead channels, really bad miss-reconstruction)
Produce Monte Carlo samples in time for the startup
Ultimate goal: in May 2008 we should have analyses that are ready to absorb 100 pb-1 of data immediately. With some work, 1000pb-1.
December 10, 2007CMS week -- collaboration meeting
38P. SphicasPhysics (status and plans)
Analysis plan: next step2007 analysis exercise approaching completion. As expected, a lot of work remains.
Now: enlarge scope to “2008 analyses”, i.e. full range of topics we expect to tackle in 2008 (and 2009)
Next step in all analyses: include CSA07 dataThis includes miscalib/misalignment in two scenarii: detector knowledge after 10pb-1 and after 100pb-1
April Physics/Trigger week: milestone for completing the 2007 and early 2008 analyses using CSA07 data
Software-wise: stay with CMSSW_1_6 until CMSSW_2 arrives (1_7 backwards incompatible with 1_6... There are ~400 Mevt events with 1_6…)
Planning on using fastsim for large samples. Need to decide on sample to be processed with full simu (and fastsim…) in time for startup
PS
December 10, 2007CMS week -- collaboration meeting
40P. SphicasPhysics (status and plans)
Outgoing conveners
Many thanks indeed toDavid Futyan (egamma), Norbert Neumeister (muons), Nikos Varelas (JetMET), Ian Tomalin (btag), Roberto Tenchini (EWK), Sasha Nikitenko (Higgs), Maria Spiropulu (SUSY-BSM), Filip Moortgat (generators), Bolek Wyslouch (heavy ions)
for the energy and zest they invested into their responsibilities. They have led these nascent groups through the transition from the old PRS organization into the new physics organization of CMS, providing the necessary continuity.
Extras
Some details of current activities in physics groups
December 10, 2007CMS week -- collaboration meeting
42P. SphicasPhysics (status and plans)
Electrons
Likelihood-based Electron ID now fully functional in CMSSW_16X (E. Di Marco, P. Govoni):
https://twiki.cern.ch/twiki/bin/view/CMS/LikelihoodElectronID
Electron Reconstruction:
Alternative track seeding for electrons using globalMixedSeeds implemented - will go in 180
(M. Sani, B. Mangano). Improved
efficiency at high η
Charge determination(D. Wardrope, W. Adam):
Charge mis-id rate can be improved using charge measurement obtained from ∆φ between pixel seed direction and SuperCluster position
electronspositrons
December 10, 2007CMS week -- collaboration meeting
43P. SphicasPhysics (status and plans)
Electron and Photon IsolationNew tools available based on HLT egamma isolation (M. Mozer):
https://twiki.cern.ch/twiki/bin/view/CMS/SWGuideEgammaIsolation
Ongoing studies to improve and optimize the algorithms (V. Sharma, M. LeBourgeois)
Systematic comparison of techniques - see talk at egamma meeting this week: http://indico.cern.ch/conferenceDisplay.py?confId=18242
Redefinition of Photon object (N. Marinelli, D. Futyan)Currently two physics objects; two photon collections (Photon and ConvertedPhoton). Will be combined into a single reco::PhotonDataFormat for 180 → Single photon collection stored in the event
analysis with photons simplified; AOD content reduced
Photon Identification (A. Kyriakis, D. Maletic)π0 rejection for unconverted photons now available as an analysis level tool https://twiki.cern.ch/twiki/bin/view/CMS/SWGuidePiZeroRejection
Requires only AOD information as input
December 10, 2007CMS week -- collaboration meeting
44P. SphicasPhysics (status and plans)
Muon Reconstruction: Performance
Efficiency – ORCA vs CMSSW (16X)
BarrelEndcaps
pT resolution
December 10, 2007CMS week -- collaboration meeting
45P. SphicasPhysics (status and plans)
Jets and Missing ET (JetMET)Analyses Notes:
Performance of MET: CMS AN-2007/041 (v.4)Editors: Greg Landsberg and Albert De RoeckPre-approved by JetMET; presented for approval this weekARC: Mayda Velasco, Luc Page, Philipp Schieferdecker
Performance of (All) Jet AlgorithmsEditors: Philipp Schieferdecker and Marek ZielinskiStatus: Draft available
Plans for Jet Energy Scale CorrectionsEditor: Robert HarrisStatus: Released for comments
Completed Internal Notes:Jet and MET Performance in CMSSW_1.2.0: CMS IN-2007/053Performance of the KT Jet Algorithm in CMSSW: CMS IN-2007/062
Upcoming Notes:Jet Energy Resolutions from dijet balance - data-driven method: draft stageSISCone performance: draft available
December 10, 2007CMS week -- collaboration meeting
46P. SphicasPhysics (status and plans)
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December 10, 2007CMS week -- collaboration meeting
47P. SphicasPhysics (status and plans)
Jet Correction Plan (near term)MCJet is now the standard correction; factorized corrections becoming available; will become standard early in 2008
L1 (Offset); Zero suppression corrections available; next: pile-up correctionsL2 (η); Data-driven dijet balance correction to replace MC truth soonL3(pT); Data-driven γ / Z + jet balance studies underway
L4(EMF)Studies using 1_5_2 and integration with L2 & L3 corrections
L5(Flavour)h dependence, integration with prior corrections and with parton level corrections
L6-L7 (Parton)First release expected early in 2008
December 10, 2007CMS week -- collaboration meeting
48P. SphicasPhysics (status and plans)
b Tag POG: Analysis Notes near completion
December 10, 2007CMS week -- collaboration meeting
49P. SphicasPhysics (status and plans)
Particle Flow Activites: TrackingTogether with the Tracker DPG
Progress continues on multiple fronts!Iterative Tracking
Faster, more efficient,
same (low) fake rate
Internal Note now exists,
Michele Pioppi
Nuclear Interactions
Identification & reconstruction,
Vincent Roberfroid
V0’s
ORCA code now ported to
CMSSW,
Brian Drell
December 10, 2007CMS week -- collaboration meeting
50P. SphicasPhysics (status and plans)
EWK status
AN 2007/26 “Towards a W±→e±ν & γ*/Ζ→e+e- cross section measurement” (Physics Plenary in January)
AN 2007/31 “Towards a W±→m±ν & γ*/Ζ→m+m-cross section measurement” (this Week at Physics Plenary)
AN 2007/28 “Tau production from W and Ζ decays”(Physics Plenary in January)
Meanwhile: multiboson studies are continuing (e.g. QCD/EWK/TOP tomorrow)
measurements useful for PDF fits are progressing (PDF Workshop on Wed)
December 10, 2007CMS week -- collaboration meeting
51P. SphicasPhysics (status and plans)
EWK: examples from theory studiesNLO/NNLO: MC@NLO+PHOTOS OK (agreement with NNLO generator RESBOS)
(N. Adam et al.)
QED: PHOTOS is OK (agreement with 2nd order QED/EW generator HORACE)
PDF uncertainties: 1% (variations) ⊕1.3% (MRST-CTEQ comparisons)
December 10, 2007CMS week -- collaboration meeting
52P. SphicasPhysics (status and plans)
First results: after previous selection signal rate is factor 10smaller than QCD multi-jet bkg rate (simulated with PYTHIA!)Factorizing the selection cuts between lepton and jets the following is obtained
(4 jets ET>30 GeV & isolated muon pT>20 GeV + acceptance cuts)
MET or HT cuts will not help in reducing this background significantlyNeed to investigate topological observables eg. sphericity, centrality, etc…
160240*300*ttbar (muon decay)
1706701670QCD
≥2 loose b-tag’s≥1 loose b-tag≥0 loose b-tagEvents for 10/pb
* exact numbers to be confirmed, but quoted as an illustrationGregory Hammad, Jan Heyninck
QCD
ttbar
Top quark: QCD multi-jet background
December 10, 2007CMS week -- collaboration meeting
53P. SphicasPhysics (status and plans)
SUSY group: Basic Tasks and Data Driven Methods
Current Work Priority: Focus on “Basic Tasks” as they are prerequisite for the analyses. This work must be carried out in close collaboration with the POG’s and other PAG’s.
Examples are:Cleaning of leptons, jets, MET and the event
Data driven estimates of efficiencies and fake rates
Background estimations from the data
Trigger definition and efficiencies (see next slides)
December 10, 2007CMS week -- collaboration meeting
54P. SphicasPhysics (status and plans)
SUSY: Task and Commitment List
Basic SUSY Tasks
Background Tasks
SUSY Analyses
Assemble new task and commitment list:https://twiki.cern.ch/twiki/bin/view/CMS/SusyTopics
This is a great opportunity for established groups to refine their commitments and for new interested groups to join!
December 10, 2007CMS week -- collaboration meeting
55P. SphicasPhysics (status and plans)
Leptonic & Hadronic SUSY TriggersA thorough suite of leptonic and hadronic triggers applicable for SUSY searches has been developed in the course of the “HLT Exercise”Leptonic SUSY triggers:
Single leptons and dileptonsLepton + (b-tagged) jets
Hadronic SUSY triggersMutlijetsAcoplanar jetsGlobal quantities (MET, HT, MET + HT)
Good start, but many of these triggers have not been thoroughly optimized for SUSY caseRemains to be done:
Evaluate the performance of the current 1_6_0 HLT suite for a set of benchmark SUSY points and find weak spotsWork with the TSG on optimization of present triggers and help introducing new ones, which can improve efficiency or increase robustness for early operationEnsure that corresponding prescaled triggers with lower thresholds are available for efficiency/turn-on determinationUnderstand what triggers with what thresholds are required for unbiased determination of backgrounds
December 10, 2007CMS week -- collaboration meeting
56P. SphicasPhysics (status and plans)
Forward physics (ex diffraction) groupAnalyses:
1. Exclusive dilepton production: γγ → ll and γPomeron →Υ (AN-2007/032) Jonathan Hollar, Xavier Rouby, Severine Ovyn
In good shape, missing are systematic studies of impact of Caloeffects (noise, dead channels, etc, using MET group procedure)
Aim at pre-approval around CMS week; approval in Jan?2. Ratio of single diffractive to inclusive production of W (AN-2007/033) Antonio Vilela Pereira, Michele Arneodo
Study of best separation criterion for diff and non-diff sample on-goingBiggest obstacle, non-availability of CSA07 EWK samples, now overcome;
Decide this week if work advanced enough for Jan pre-appMeanwhile contributions to EWK W →µν Xsection note study of MET calibration method from Z → µµ events
3. Forward di-jet production (no AN yet) Salim Cerci, David D’EnterriaWill decide this week about time scale for (pre-) approval
Overall goal: Have results approved in time for the spring conferences
P. SphicasPhysics (status and plans)
Heavy Ion GroupPaper 2007 analyses
Joint QCD/HI analyses for 2007 paper exercise are scheduled for approval this CMS week
Major HI conference 4-10 February 2008Group is focused on getting new studies ready for that conference
One plenary talk
Three parallel talks
γ+jet as a probe of quenching in HI events
Z0→µµ in HI events
Soft physics capabilities in pp collisions at 14 TeV
Analyses and approval process prioritized according to this conference needs during December and January
Soft physics talk will be based on 2007 paper
Pre-approvals planned for CMS week for γ+jet and Z0 analyses
Very tight schedule
December 10, 2007CMS week -- collaboration meeting
58P. SphicasPhysics (status and plans)
Cal
oJe
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esp
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se
CaloJet η
K. Kousouris
Jet Correction StatusL2 (η) & L3 (PT) Correction in CMSSW L4(EMF) Correction in CMSSW
L5(Flavour) Correction in CMSSW L6-L7(Parton) Correction Developing
MC
Jet
Res
po
nse
S. Esen
Jet
Fla
vou
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orr
ecti
on
J. Cammin Par
ton
Res
po
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GenJet ET (GeV)
A. Santocchia