Checking different tracking algorithms with a di sample
Start with sample of p11.11 data on SAM
recoA_reco_dimuon_third_merged%tk-p11.11-%.root
Look at the six different algorithms: (gtr,htf,gtrela,htfela,gtrhtf,aa)
Sample has ~30K events / algorithm (gtrela has 21K, htfela has 28K)
Ran each algorithm sample through the exact same analysis macros
Do fits and compare to known values
Observations
Ryan J. Hooper (University of Notre Dame: Ryan J. Hooper (University of Notre Dame: 2525, , UofM: UofM:
2323))
J/Psi eV
= 5 keV
gtr htf gtrela htfela gtrhtf aa# Events 2913 3038 2879 4067 4029 2853Mass (MeV) 3067 ±± 5 3072 ±± 4 3135 ±± 7 3091 ±± 5 3071 ±± 4 3204 ±± 6
eV 109 ±± 33 105 ±± 33 155 ±± 5 121 ±± 3 102 ±± 3 135 ±± 4
“Tight” Muons matched ( to Gtr401@DCA tracks (“Gavin’s” Matching)
Matching requires both tracks to have pT > 2.5 GeV
Track nhits > 11
Fit peak with Gaussian + Linear BK
Upsilon 1SeV
1S) = 1.3 keV
gtr htf gtrela htfela gtrhtf aa# Events 2913 3038 2879 4067 4029 2853Mass (MeV) 9375 ±± 53 9381 ±± 50 9514 ±± 50 9472 ±± 43 9374 ±± 44 9748 ±± 64
MeV 454 ±± 3377 454 ±± 3399 453 ±± 36 400 ±± 34 402 ±± 36 459 ±± 50
“Tight” Muons matched ( to Gtr401@DCA tracks (“Gavin’s” Matching)
Require both tracks to have pT > 2.5 GeV
Track nhits > 11 (SAME CUTS AS J/PSI !)
Fit peak with Gaussian + Linear BK
Z GeV
= 84 MeV
gtr htf gtrela htfela gtrhtf aaTotal#Events
43 33 30 46 52 32# Events inmass window(72-112 GeV)
24 20 18 29 31 21Mass (GeV) 93.1 ±± 3.5 90.9 ±± 3.3 90.2 ±± 6.3 92.2 ±± 2.1 93.1 ±± 2.2 92.6 ±± 4.0
GeV 9.4 ±± 33..00 6.0 ±± 22..11 11.4 ±± 4.8 6.3 ±± 1.5 6.8 ±± 1.7 6.5 ±± 0.07
“Tight” Muons matched ( to Gtr401@DCA tracks (“Gavin’s” Matching)
Match requiring both tracks to have pT > 2.5 GeV
Track nhits > 11…...Then require both tracks to have pT > 15 GeV!!!
Fit peak to a Gaussian + Linear BK
ObservationsThree different resonances were look at J/Psi, Upsilon and Z
Saw a few events that might have some duplication of tracks or some other strange behavior ???
Run: 152415 152420
Event: 532207 1033338
gtr htf gtrela htfela gtrhtf aaFor J/Psi: from PDG
7.5 6.25 5.4 1.2 6.5 17.8For Upsilon: from PDG
1.6 1.6 1.1 0.3 2.0 4.5For Z: from PDG
0.55 0.09 0.15 0.48 0.87 0.35