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Fragmentation, NRQCD and NNLO Factorization Analysis in Heavy Quarkonium Production

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arxiv hep-ph/0509021 v2 pith:FJDWCG3J submitted 2005-09-02 hep-ph nucl-th

Gouranga C. Nayak (SUNY , Stony Brook) , Jian-Wei Qiu (Iowa State U.) , George Sterman (SUNY This is my paper · ORCID
classification hep-phnucl-th
keywords fragmentationfactorizationfunctionsnrqcdproductionelementsgaugeheavy
verification ladder T0 review T1 audit T2 compute T3 formal

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We discuss heavy quarkonium production through parton fragmentation, including a review of arguments for the factorization of high-p_T particles into fragmentation functions for hadronic initial states. We investigate the further factorization of fragmentation functions in the NRQCD formalism, and argue that this requires a modification of NRQCD octet production matrix elements to include nonabelian phases, which makes them gauge invariant. We describe the calculation of uncanceled infrared divergences in fragmentation functions that must be factorized at NNLO, and verify that they are absorbed into the new, gauge invariant matrix elements.

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Cited by 7 Pith papers

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