Recent Developments in Heavy Quark and Quarkonium Production
Recent measurements of J/{psi} production in e{sup +}e{sup -} 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.
- Research Organization:
- Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
- Sponsoring Organization:
- USDOE; USDOE Office of Energy Research (ER) (US)
- DOE Contract Number:
- AC05-84ER40150
- OSTI ID:
- 836843
- Report Number(s):
- JLAB-THY-03-222; DOE/ER/40150-3142; hep-ph/0312239; TRN: US0500814
- Resource Relation:
- Conference: 23rd International Symposium on Multiparticle Dynamics (ISMD 2003), Cracow (PL), 09/05/2003--09/11/2003; Other Information: PBD: 1 Jan 2004
- Country of Publication:
- United States
- Language:
- English
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