NLO hard function in TMD factorization for quarkonium electroproduction with predictions for unpolarized J/ψ cross section at EIC.
Fragmentation, Factorization and Infrared Poles in Heavy Quarkonium Production
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abstract
We explore the role of soft gluon exchange in heavy quarkonium production at large transverse momentum. We find uncanceled infrared poles at NNLO that are not matched by conventional NRQCD matrix elements. We show, however, that gauge invariance and factorization require that conventional NRQCD production operators be modified to include nonabelian phases or Wilson lines. With appropriately modified operators, factorization is restored at NNLO. We also argue that, in the absence of special cancellations, infrared poles at yet higher orders may require the inclusion of additional nonlocal operators, not present in the NRQCD expansion in relative veloctiy.
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UNVERDICTED 2representative citing papers
NRQCD with Glauber gluons is proposed as a universal microscopic framework for quarkonium interactions across cold nuclear matter, dense hadron gas, and quark-gluon plasma phases.
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Modeling the TMD shape function in $J/\psi$ electroproduction
NLO hard function in TMD factorization for quarkonium electroproduction with predictions for unpolarized J/ψ cross section at EIC.
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Toward an effective theory of quarkonium production in nuclear matter
NRQCD with Glauber gluons is proposed as a universal microscopic framework for quarkonium interactions across cold nuclear matter, dense hadron gas, and quark-gluon plasma phases.