L2 Muon Trigger Study Status Report B. de la Cruz , C. Diez (CIEMAT, Madrid) Muon HLT Meeting 20th March, 2009 20-May-18 Muon HLT Meeting C. Diez

Motivation for the study L2 Muon Trigger is already established but there may be still room for improvement optimizing the 2 step algorithm: Seeding Pattern Recognition in the muon system and the tuning of the L2 parameters. FirstOverview: http://indico.cern.ch/getFile.py/access?contribId=3&resId=0&materialId=slides&confId=52841 Where we reproduced validation histograms with official HLT Validation package (MultiTrackValidator Analyzer for residuals, pulls and efficiencies of track reconstruction) running on MC samples. 20-May-18 Muon HLT Meeting C. Diez

First Tests on L2MuonProducer According to Riccardo and J.Roch, several L2 optimizations possible:  Use of FastSteppingHelixPropagator (code implemented some time ago by Slava Krutelyov but never activated) instead of usual SteppingHelixPropagator, in the L2 pattern recognition and reconstruction (bigger extrapolation steps in L2 propagation)  Add a final refit of the L2 muon track, considering all the final hits selected after a pattern recognition inside-out (FW) and outside-in (BW)  In the case of Refitting, drop the outside-in (BW) pattern recognition, to save time Use CMSSW_3_1_0_pre3 to test optimizations above and Z MonteCarlo sample: /RelValZMM/CMSSW_3_1_0_pre3_STARTUP_30X_v1/GEN-SIM-DIGI-RAW-HLTDEBUG (9000 evts) Results comparing distributions of several variables (pt, eta, phi), their pulls and resolutions will be shown here. 20-May-18 Muon HLT Meeting C. Diez

Tests on L2MuonProducer Options presented in previous slides tested alone and in combination Possible improvements Usual SteppingHelix Propagator (default config) Fast SteppingHelix Propagator ReFit = False Default configuration Test FastSteppingHelix ReFit = True Test Refit Test FastSteppingHelix+ReFit BW pattern reco = False (ReFit = True) Test pattern reco = False Test FastSteppingHelix+Refit+NoBW 20-May-18 Muon HLT Meeting C. Diez

ReFit implemented in L2 In HLTrigger/Configuration/python/HLT_2E30_cff.py in L2MuonProducer, activate DoRefit = cms.bool( True) adding as Parameters those from RecoMuon/StandAloneMuonProducer/python/StandAloneMuons_cfi.py Use CMSSW_3_1_0_pre3 to test optimizations above and Z MonteCarlo sample: /RelValZMM/CMSSW_3_1_0_pre3_STARTUP_30X_v1/GEN-SIM-DIGI-RAW-HLTDEBUG (9000 evts) 20-May-18 Muon HLT Meeting C. Diez

Pt distributions Comparing with Pt L1 distribution: Removing BW pattern recognition, Pt distribution Is still “discrete” L1 Pt values in 2 bins: Correction shift by 2 GeV in Barrel and 3GeV in EndCaps 20-May-18 Muon HLT Meeting C. Diez

h distributions h only for “standard” SteppingHelixPropagator (similar for FastStep.) Removing BW pattern recognition affects to the values in the barrel: Is that the expected behaviour? No mayor differences between distributions with/ without reffiting 20-May-18 Muon HLT Meeting C. Diez

Pt resolution (see next slide) by 3% Refit improves resolution (see next slide) by 3% No BW filter: resolution gets worse by 10% (respect to the “original” L2 reco) Implementing the FastSteppingHelix propagator does not the resolution 20-May-18 Muon HLT Meeting C. Diez

Pt resolution ~20% ~31% ~17% 20-May-18 Muon HLT Meeting C. Diez

Pt resolution vs Pt & h 20-May-18 Muon HLT Meeting C. Diez

Comment on L2 vs L1 20-May-18 Muon HLT Meeting C. Diez

f resolution Changes in resolution smaller than in the case of Pt Flat distributions in f in all cases (not shown) Changes in resolution smaller than in the case of Pt 20-May-18 Muon HLT Meeting C. Diez

f resolution 20-May-18 Muon HLT Meeting C. Diez

h resolution Resolution similar in all cases removing BW patter recogition worsens the tail of the distributions, similar peak 20-May-18 Muon HLT Meeting C. Diez

h resolution s~ 0.0048 s~ 0.005 s~ 0.0053 No changes with new propagator in resolution, refit doesn´t improves it H resolution with BW pattern recognition only slightly worse (~5% difference) 20-May-18 Muon HLT Meeting C. Diez

Pull distributions s~ 2.2 s~ 2.3 s~ 1.4 s~ 1.9 s~ 1.1 s~ 2.1 s~ 1.1 mean -0.09 -0.03 ~ -0.18 s~ -0.09 s~ 0.45 20-May-18 Muon HLT Meeting C. Diez

Pull distributions s~ 1.05 s~ 2.07 s~ 1.03 s~ 2.20 s~ 0.95 s~ 1.40 20-May-18 Muon HLT Meeting C. Diez

Sigma :Pull distributions vs h Pulls do not change with the FastStepping Helix Propagator Flatter distributions with Refit for distributions as a function of h 20-May-18 Muon HLT Meeting C. Diez

Pull distributions vs h Pulls do not change with the FastStepping Helix Propagator Flatter distributions with Refit for distributions as a function of h 20-May-18 Muon HLT Meeting C. Diez

Comments & Outlook The improvement on the “SteppingHelixPropagator ” does not worsen the resolution Compare these set of validation plots to existing ones in http://cern.ch/cms-muonhltval (Jeff. Klukas). The work will go on, paying attention to the different L2 parameters being used 20-May-18 Muon HLT Meeting C. Diez