Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2003-12-17
Acta Phys.Polon. B35 (2004) 121-130
Physics
High Energy Physics
High Energy Physics - Phenomenology
9 pages, 2 figures, talk given at XXXIII International Symposium on Multiparticle Dynamics, September 5-11, 2003, Krakow, Pola
Scientific paper
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.
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