Fragmentation, NRQCD and Factorization in Heavy Quarkonium Production

Journal Article · Tue Jul 11 00:00:00 EDT 2006 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.2220338· OSTI ID:20873388

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

---

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 factorization in heavy quarkonium production in high energy collisions using NRQCD. Infrared divergences at NNLO are not matched by conventional NRQCD matrix elements. However, we show that gauge invariance and factorization require that conventional NRQCD production matrix elements be modified to include Wilson lines or non-abelian gauge links. With this modification NRQCD factorization for heavy quarkonium production is restored at NNLO.

• OSTI ID: 20873388
• Journal Information: AIP Conference Proceedings, Vol. 842, Issue 1; Conference: 17. international conference on particles and nuclei, Santa Fe, NM (United States), 23-30 Oct 2005; Other Information: DOI: 10.1063/1.2220338; (c) 2006 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
COLLIDING BEAMS
FACTORIZATION
GAUGE INVARIANCE
HEAVY ION REACTIONS
INFRARED DIVERGENCES
MATRIX ELEMENTS
QUANTUM CHROMODYNAMICS
QUARK MODEL
QUARKONIUM