Polarized J / ψ production in semi-inclusive DIS at large Q 2 : Comparing quark fragmentation and photon-gluon fusion

We compare the relative importance of different mechanisms for polarized J / ψ production in semi-inclusive deep inelastic scattering processes at large Q 2 . The transverse momentum dependent (TMD) factorization framework and nonrelativistic quantum chromodynamics are used to study the leading cont...

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Bibliographic Details
Published in:Physical review. D 2024-04, Vol.109 (7), Article 074032
Main Authors: Copeland, Marston, Fleming, Sean, Gupta, Rohit, Hodges, Reed, Mehen, Thomas
Format: Article
Language:English
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Summary:We compare the relative importance of different mechanisms for polarized J / ψ production in semi-inclusive deep inelastic scattering processes at large Q 2 . The transverse momentum dependent (TMD) factorization framework and nonrelativistic quantum chromodynamics are used to study the leading contributions from light quark fragmentation to polarized J / ψ , and compared to direct production via photon-gluon fusion, which can proceed through color-singlet as well as color-octet mechanisms. We identify kinematic regimes where light quark fragmentation dominates, allowing for the extraction of the S 3 1 [ 8 ] matrix element, as well as regimes where photon gluon fusion dominates, suggesting that the gluon TMD parton distribution function can be probed.
ISSN:2470-0010
2470-0029
DOI:10.1103/PhysRevD.109.074032