Fragmentation, NRQCD and Factorization in Heavy Quarkonium Production

Details Fragmentation, NRQCD and Factorization in Heavy Quarkonium Production Fragmentation, NRQCD and Factorization in Heavy Quarkonium Production

2005-12-28

arxiv.org/abs/hep-ph/0512345v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

3pages Latex, 3eps figures, Talk given by G. C. Nayak at PANIC05 Santa Fe, NM, USA, October 24-28, 2005

Scientific paper

10.1063/1.2220338

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.

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