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| Re: CBM cockails [message #14902 is a reply to message #14901] |
Mon, 01 July 2013 13:35  |
Partha Pratim Bhaduri
Messages: 19
Registered: March 2008
Location: VECC , Kolkata
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occasional visitor |
From: 202.41.93*
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Hello Tetyana,
Thank you so much for resuming the discussion forum. I would like to propose to have a single forum like this di-lepton one, instead of having different formus for low-mass and charmonia or separate discussion forums for electrons/muons.
I have tried to estimate relative contributions to the di-muon spectrum from J/Psi decay and DrellYan process. The figure is attached where I have plotted the differential distribution of production cross sections as a function of pair rapidity in cms frame, for 25 GeV p+p collisions. Both the cross sections are calculated using LO pQCD (with inclusion of proper K factors) meaning for cc-bar I consider light quark annihilation & gluon fusion; for DY qq-bar annihilation only. The pdf set used is LO MSTW2008. For DY, the mass region integrated is 2.9 to 4.5 GeV, a region used by NA50 to report their J/Psi to DY ratio data.
Thnaks to Tetyana again for posting the link for the QWG latest report. Another interesting article I recently found at arxiv regarding quarkonium data:
" A database for quarkonium and open heavy-flavor production in hadronic collisions with HepData"; hep-ex/1304.2224
Regards,
Partha
Partha Pratim Bhaduri
Scientific Officer
Experimental High Energy Physics Division
Variable Energy Cyclotron Centre
Kolkata
India
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