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CBM cockails [message #14901] Mon, 01 July 2013 11:44 Go to next message
Tetyana Galatyuk is currently offline  Tetyana Galatyuk
Messages: 95
Registered: July 2004
Location: GSI, Darmstadt
continuous participant
From: *gsi.de
Dear all,

enclosed please find below link to the short reports about the CBM cocktail generation:
* Low- and intermediate mass : http://cbm-wiki.gsi.de/cgi-bin/viewfileauth/LowMass/CbmDileptons130621?f ilename=2013_06_20_HadronicCocktails.pdf
* J/psi : http://cbm-wiki.gsi.de/pub/LowMass/CbmDileptons130621/ppbhaduri_dilepton meet_june21st2013.pdf

-------------------------------

Action items:
- fix rapidity width for J/psi (Partha)
- ccbar contribution?
- "Heavy quarkonium: progress, puzzles, and opportunities", Eur. Phys. J. C (2011) 71: 1534, DOI 10.1140/epjc/s10052-010-1534-9 - additional input for the J/psi simulations


your comments and questions are welcome.

Yours,
Tetyana
Re: CBM cockails [message #14902 is a reply to message #14901] Mon, 01 July 2013 13:35 Go to previous message
Partha Pratim Bhaduri is currently offline  Partha Pratim Bhaduri
Messages: 19
Registered: March 2008
Location: VECC , Kolkata
occasional visitor
From: 202.41.93*
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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