2010/12/13 by J. P. Lansberg, Lansberg, J. P.
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High Energy Physics - Phenomenology (hep-ph) #Nuclear Experiment (nucl-ex) #Nuclear Theory (nucl-th) #hep-ex #hep-ph #nucl-ex #nucl-th
paper · pdf · doi:10.48550/arxiv.1012.2815
Contributed to the 35th International Conference on High Energy Physics -- ICHEP 2010, Paris, France, July 22-28, 2010. 5 pages, 4 figures, uses PoS.cls (included)
arxiv created 2010/12/13 · arxiv updated 2010/12/14
We evaluate the production cross section for direct J/Psi and Upsilon integrated in PT for various collision energies in the QCD-based Colour-Singlet Model (CSM). We consider the LO contribution from gluon fusion whose PT-integrated cross section shows a very good agreement with the Tevatron and LHC data, both for J/Psi and Upsilon. The rapidity distribution of this yield is evaluated in the central region relevant for the ATLAS and CMS detectors, as well as in the more forward region relevant for the ALICE and LHCb detectors. The results obtained here are compatible with those of other approaches within the range of the theoretical uncertainties which are admittedly very large. This suggests that the "mere" measurements of the yield at the LHC will not help disentangle between the different possible quarkonium production mechanisms. Yet, the comparison with the first LHC results by ALICE, ATLAS, CMS and LHCb confirms that the CSM correctly accounts for the PT-integrated yield at sqrt(s)=7 TeV.