Fragmentation, nonrelativistic QCD, and NNLO factorization analysis in heavy quarkonium production

Journal Article · Thu Dec 01 00:00:00 EST 2005 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PhysRevD.72.114012· OSTI ID:20774432

Nayak, Gouranga C; Sterman, George ^[1]; Jianwei, Qiu ^[2]

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1. C.N. Yang Institute for Theoretical Physics, Stony Brook University, SUNY, Stony Brook, New York 11794-3840 (United States)
2. Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011-3160 (United States)

We discuss heavy quarkonium production through parton fragmentation, including a review of arguments for the factorization of high-p{sub T} particles into fragmentation functions for hadronic initial states. We investigate the further factorization of fragmentation functions in the nonrelativistic QCD (NRQCD) formalism, and argue that this requires a modification of NRQCD octet production matrix elements to include non-Abelian phases, which makes them gauge invariant. We describe the calculation of uncanceled infrared divergences in fragmentation functions that must be factorized at next-to-next-to-leading order, and verify that they are absorbed into the new, gauge-invariant matrix elements.

• OSTI ID: 20774432
• Journal Information: Physical Review. D, Particles Fields, Vol. 72, Issue 11; Other Information: DOI: 10.1103/PhysRevD.72.114012; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
FACTORIZATION
GAUGE INVARIANCE
HADRONS
INFRARED DIVERGENCES
MATRIX ELEMENTS
PARTICLE PRODUCTION
PERTURBATION THEORY
QUANTUM CHROMODYNAMICS
QUARKONIUM
REVIEWS