1 / 10

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.

jael-warner
Télécharger la présentation

Invariant Mass Calculation J/ψ

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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?

More Related