Recent Developments in Heavy Quark and Quarkonium Production
Abstract
Recent measurements of J/psi production in e^+ e^- colliders pose a challenge to the NRQCD factorization theorem for quarkonium production. Discrepancies between leading order calculations of color-octet contributions and the momentum distribution of J/psi observed by Belle and BaBar are resolved by resumming large perturbative and nonperturbative corrections that are enhanced near the kinematic endpoint. The large cross sections for J/psi + c + \bar c and double quarkonium production remain poorly understood. Nonperturbative effects in fixed-target hadroproduction of open charm are also discussed. Large asymmetries in the production of charm mesons and baryons probe nonperturbative corrections to the QCD factorization theorem. A power correction called heavy-quark recombination can economically explain these asymmetries with a few universal parameters.
Cite
@article{arxiv.hep-ph/0312239,
title = {Recent Developments in Heavy Quark and Quarkonium Production},
author = {Thomas Mehen},
journal= {arXiv preprint arXiv:hep-ph/0312239},
year = {2014}
}
Comments
9 pages, 2 figures, talk given at XXXIII International Symposium on Multiparticle Dynamics, September 5-11, 2003, Krakow, Poland