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Invariant Mass Calculation J/ψ

Invariant Mass Calculation J/ψ. Rosi Reed 3/5/08. Introduction. J/ψ is the first excited state of charmonium Rest mass 3.096 Gev/c 2 Full Width 93.4 keV One decay channel is: e + e - BR 5.94% Width 5.55 keV J/ ψ Triggers 117705 and 137705 Run # > 7132061 for full CTB coverage pp 2006.

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Invariant Mass Calculation J/ψ

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  1. Invariant Mass Calculation J/ψ Rosi Reed 3/5/08

  2. Introduction • J/ψ is the first excited state of charmonium • Rest mass 3.096 Gev/c2 • Full Width 93.4 keV • One decay channel is: e+e- • BR 5.94% • Width 5.55 keV • J/ ψ Triggers 117705 and 137705 • Run # > 7132061 for full CTB coverage • pp 2006

  3. First cuts on dE/dx

  4. Gaussian Fits to log(dEdx) TPC Hits 30 TPC Hits 15

  5. Invariant Mass Calculation w/Errors Cut log(dEdx>1.25)

  6. Invariant Mass Calculation w/Errors P >2.0, log(dEdx*1e6)>1.24 P >2.5, log(dEdx*1e6)>1.26 P >3.0, log(dEdx*1e6)>1.28 P >4.0, log(dEdx*1e6)>1.31 TPC Hits > 30

  7. TPC Hits – 30 is too tight

  8. Invariant Mass Calculation w/Errors P >2.0, log(dEdx*1e6)>1.24 P >2.5, log(dEdx*1e6)>1.26 P >3.0, log(dEdx*1e6)>1.28 P >4.0, log(dEdx*1e6)>1.31 TPC Hits > 23

  9. Invariant Mass Calculation w/Errors TPC Hits > 23 P >1.5, log(dEdx*1e6)>1.2

  10. Future Work + Questions • Extrapolate track to tower in the EMC • Plot p/E per event • Include cuts based on EMC signal • Towers separated by >60 degrees phi • p/E for PID? • Total E? • Inv. Mass calculation has • B = 2*(N++N--)^2 • Why is this multiplied by 2? • What was the measured number of J/ψ in the pp2006 data set?

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