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Evaluating Tracking Algorithms for Dimuon Analysis in P11.11 Data

In this study, we assess six tracking algorithms (gtr, htf, gtrela, htfela, gtrhtf, aa) using a sample of approximately 30,000 events per algorithm from the P11.11 data, with a focus on J/Psi, Upsilon, and Z resonances. Each algorithm underwent identical analysis macros, including fits against known values. Observations indicate specific discrepancies in mass measurements, particularly with lower masses, while the htfela algorithm demonstrated the best overall performance across mass scales. Our findings offer insights for future applications in particle tracking.

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Evaluating Tracking Algorithms for Dimuon Analysis in P11.11 Data

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  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_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

  2. J/Psi m mM = 3096.9 MeVGmm = 5 keV • “Tight” Muons matched (h,f) 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

  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@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

  6. Upsilon m m

  7. Upsilon m m

  8. Z m mM = 91.19 GeVGmm = 84 MeV • “Tight” Muons matched (h,f) 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

  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 !

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