Outline

  • estimated J/psi contribution in HFE electron

Result

J/psi spectrum

JpsiCont1.png
  • used J/psi in PbPb measured in CMS (0-100% & |y|<2.4)
  • scaled 0.0594 (branching ratio of J/psi->e); dashed line
  • Compared with J/psi->e @ pp 2.76 TeV
    • take from cocktail calculation which Ben used for 2.76 TeV HFE cross section measurement
    • scaled Taa
    • assumed suppression factor ; 0.2, 0.3, 0,4 from CMS paper

RAA with the J/psi estimate

JpsiSub.png
  • Subtract J/psi contribution from HFE spectrum
    • used J/psi->e @ pp 2.76 TeV (3 different suppression factor)
  • Not sure to subtract pT < 6 GeV/c (subtract pT > 6 GeV/c ?)

JpsiRaa.png

Systematic uncertainty

  • Evaluated by assuming no energy loss and strong energy loss (0.2)
  • Compared the HFE yields after subtracting J/psi -> e.
  • Make the ratio
    • (HFE - e(J->e x 1)) / (HFE - e(J->e x 0.4))
    • (HFE - e(J->e x 0.2)) / (HFE - e(J->e x 0.4))
  • maximum +- 17 % difference
JpsiContRatio.png

Upsilon

  • Take Upsilon spectrum @ 2.6 TeV PbPb collisions (0-100%, |y|<2.4)
  • Scaled & the branching ratio to decay electrons
JpsiUpsilonCont1.png

-- ShingoSakai - 15-Jul-2012

Topic attachments
I Attachment History Action Size Date Who Comment
PNGpng JpsiCont1.png r1 manage 14.0 K 2012-07-15 - 00:51 Ssakai  
PNGpng JpsiContRatio.png r1 manage 11.4 K 2012-07-16 - 14:32 Ssakai  
PNGpng JpsiRaa.png r1 manage 15.4 K 2012-07-15 - 01:53 Ssakai  
PNGpng JpsiSub.png r2 r1 manage 13.9 K 2012-07-15 - 02:08 Ssakai  
PNGpng JpsiUpsilonCont1.png r2 r1 manage 17.1 K 2012-07-16 - 16:58 Ssakai  
Edit | Attach | Watch | Print version | History: r4 < r3 < r2 < r1 | Backlinks | Raw View | WYSIWYG | More topic actions
Topic revision: r4 - 2014-06-09 - ShingoSakai
 
    • Cern Search Icon Cern Search
    • TWiki Search Icon TWiki Search
    • Google Search Icon Google Search

    Main All webs login

This site is powered by the TWiki collaboration platform Powered by PerlCopyright & 2008-2019 by the contributing authors. All material on this collaboration platform is the property of the contributing authors.
Ideas, requests, problems regarding TWiki? Send feedback