L2 trigger: chi2 tuningL2 trigger: chi2 tuning

(includes changes/comments discussed in the meeting) (includes changes/comments discussed in the meeting)

Carmen Diez PardosSilvia Goy López

CIEMAT Madrid

11/01/2012

1C. Diez Pardos

Check effect of changing chi2 Check effect of changing chi2 ValidHits distributions: # of L2 with none validhits Effect on resolution (compared to offline pT)

Data: 2011RunB Zskim (~55K events)(/SingleMu/Run2011B-ZMu-PromptSkim-v1) SELECTION: events with a good offline Muon:

Tracker&Global, chi2<10, relIso<0.15, ValidHits>10, ValidMuonHits>0, MatchedStations>1, pixelHits>0, abs(eta)<2.1

1. Resolution: hltL2MuonCandidate matched to the closest (smallest DeltaR) offline muon

2C. Diez Pardos

ValidHits with different chi2ValidHits with different chi2

3C. Diez Pardos

chi2 #0ValidHit

/Total

#0ValidHit/Total

400 0.0053 0.0016

350 0.0055 0.0014

300 0.0059 0.0011

250 0.0065 0.0010

100 0.0134 0.0019

25 0.0354 0.00952

L2MuonCandidates matched to the CLOSEST offline muon

For chi2>300 rather small difference

1/pT resolution 1/pT resolution

4C. Diez Pardos

distributions: ValidHits>0

1/pT resolution 1/pT resolution

5C. Diez Pardos

No cut in ValidHits

1/pT resolution 1/pT resolution 1/pT resolution 1/pT resolution

chi2 RMS

(ValidHits>0)

SIGMA RMS

(All L2)

SIGMA

(All L2)

400 0.2434 0.2504 0.1522 0.1449 0.2417 0.1527

350 0.2431 0.2498 0.1520 0.1448 0.2414 0.1526

300 0.2424 0.2489 0.1518 0.1447 0.2407 0.1524

250 0.2422 0.2457 0.1512 0.1445 0.2439 0.1519

100 0.2376 0.2414 0.1491 0.1438 0.2404 0.1503

25 0.2321 0.2364 0.1441 0.1417 0.2391 0.1471

pT resolution pT resolution

7C. Diez Pardos

PT distributions: ValidHits>0

pT resolution pT resolution

8C. Diez Pardos

No cut in ValidHits

pT resolution pT resolution

chi2 RMS

(ValidHits>0)

SIGMA RMS

(All L2)

SIGMA

(All L2)

400 0.2565 0.2509 0.1611 0.1556 0.2616 0.1616

350 0.2555 0.2496 0.1609 0.1554 0.2608 0.1614

300 0.2540 0.2485 0.1606 0.1551 0.2595 0.1612

250 0.2560 0.2468 0.1599 0.1547 0.2559 0.1605

100 0.2485 0.2379 0.1562 0.1525 0.2513 0.1572

25 0.2352 0.2281 0.1500 0.1496 0.2450 0.1530

Efficiency (HLT_Mu24, HLT_Mu40) Efficiency (HLT_Mu24, HLT_Mu40)

10C. Diez Pardos

Efficiency for positive charged muon 0.2% higher than for negative muons

Tag+Probe pairs Mmumu (60,120) GeV + criteria Slide1pt> 30 GeV (40 GeV for HLT_Mu40)

chi2 HLT_Mu24 (%)

(stat error ~ 0.002)

(no cut in ValidHits)

HLT_Mu40(stat

error ~ 0.003)

HLT_Mu24 (%)

(stat error ~ 0.002)

(no cut in ValidHits)

HLT_Mu40(stat

error ~ 0.003)

400 91.889 91.271 91.917 91.427

350 91.904 (92.230)

91.223

(91.530)

92.042 (92.230)

91.492

(91.530)

300 91.902 91.200 92.067 91.556

250 91.892 (92.253)

91.196 (91.530

)

92.119 (92.253)

91.541(91.530

)

100 91.679 91.902 92.582 91.874

25 91.500(92.546)

90.686 (91.733

)

92.715(92.546)

92.037(91.733

)