Testing the QCD fragmentation mechanism on heavy quarkonium production at LHC
Abstract
We calculate the fragmentation function for charm quark into J/psi at the QCD next-to-leading-order (NLO) and find that the produced J/psi is of larger momentum fraction than it is at the leading-order. Based on the fragmentation function and partonic processes calculated at the NLO, the transverse momentum distribution on J/psi hadroproduction associated with a charm c (or \bar{c}) jet are predicted. We find that the distribution is enhanced by a factor of 2.0--3.3 at the NLO as p_t increased from 10 GeV to 100 GeV and it is measurable at the LHC with charm tagger. The measurement at the LHC will supply a first chance to directly test the QCD fragmentation mechanism on heavy quarkonium production where the fragmentation function is calculable in perturbative QCD. It is also applied to J/psi (Upsilon) production in the decay of Z^0 (top quark).
Keywords
Cite
@article{arxiv.1102.0118,
title = {Testing the QCD fragmentation mechanism on heavy quarkonium production at LHC},
author = {Bin Gong and Rong Li and Jian-Xiong Wang},
journal= {arXiv preprint arXiv:1102.0118},
year = {2011}
}
Comments
4 pages, 3 figures