Quarkonium production in pp collisions with the CMS detector

Alexis Pompili, G.E. Bruno, G. Chiodini, P. Colangelo, C. Corianò, D. Creanza, F. De Fazio, E. Nappi
2014 EPJ Web of Conferences  
The studies of the inclusive production of heavy quarkonium states at LHC are very important to improve our understanding of QCD and hadron formation, given that the heavy-quark masses allow the application of theoretical tools less sensitive to nonperturbative effects. The prompt cross sections and polarizations measured by CMS and the other LHC experiments are presented for the five S-wave states J/ψ, ψ(2S ) and Υ(nS ) (n = 1, 2, 3) and discussed especially in comparison to the theoretical
more » ... the theoretical predictions provided by Non Relativistic QCD. Quarkonium production In the QQ center-of-mass frame quarks can be considered not relativistic; being v the velocity of the heavy-quark in this frame, ν = v/c 1 is a better approximation for bb than cc. The non-relativistic QCD (NRQCD) is an effective field theory that treats heavy quarkonia as non-relativistic systems [5] . The heavy-quark mass is m Q Λ QCD which provides a natural boundary between short-and a
doi:10.1051/epjconf/20148000006 fatcat:tapgftmaevhh7iokwhkjh4z54i