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arXiv · 2310.13737

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

Marston Copeland·Sean Fleming·Rohit Gupta·Reed Hodges·Thomas Mehen
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Abstract

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 $^3S_1^{[8]}$ matrix element, as well as regimes where photon gluon fusion dominates, suggesting that the gluon TMD parton distribution function can be probed.

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Marston Copeland, Sean Fleming, Rohit Gupta, Reed Hodges, Thomas Mehen. 2024-04-29. Polarized $J/ψ$ production in semi-inclusive DIS at large $Q^2$: Comparing quark fragmentation and photon-gluon fusion. https://doi.org/10.1103/physrevd.109.074032

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