Checking different tracking algorithms with a dim sample

1
Checking different tracking algorithms with a dim
sample
Ryan J. Hooper (University of Notre Dame 25,
UofM 23)

• Start with sample of p11.11 data on SAM
• recoA_reco_dimuon_third_mergedtk-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

2
J/Psi m mM 3096.9 MeVGmm 5 keV

• Tight Muons matched (h,f) to Gtr401_at_DCA tracks
  (Gavins Matching)
• Matching requires both tracks to have pT gt 2.5
  GeV
• Track nhits gt 11
• Fit peak with Gaussian Linear BK

3
J/Psi m m
4
J/Psi m m
5
Upsilon m mM1S 9460 MeV G(1S)mm 1.3
keV

• Tight Muons matched (h,f) to Gtr401_at_DCA tracks
  (Gavins Matching)
• Require both tracks to have pT gt 2.5 GeV
• Track nhits gt 11 (SAME CUTS AS J/PSI !)
• Fit peak with Gaussian Linear BK

6
Upsilon m m
7
Upsilon m m
8
Z m mM 91.19 GeVGmm 84 MeV

• Tight Muons matched (h,f) to Gtr401_at_DCA tracks
  (Gavins Matching)
• Match requiring both tracks to have pT gt 2.5 GeV
• Track nhits gt 11...Then require both tracks to
  have pT gt 15 GeV!!!
• Fit peak to a Gaussian Linear BK

9
Z m m
10
Z m m
11
Observations

• Three 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

12
Observations (cont.)

• At lower masses the aa and gtrela algos seemed to
  over measure the mass while gtrhtf, htf and gtr
  appears to under measure!
• Overall the htfela algorithm looked to perform
  the best over all the mass scales !