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

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arxiv 2310.13737 v2 pith:ZXCAYJCJ submitted 2023-10-20 hep-ph

Marston Copeland , Sean Fleming , Rohit Gupta , Reed Hodges , Thomas Mehen This is my paper · ORCID
classification hep-ph
keywords fragmentationfusionpolarizedproductionquarkdominatesgluonlarge
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abstract

We compare the relative importance of different mechanisms for polarized $J/\psi$ 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 $J/\psi$, 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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Cited by 3 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. The role of the soft scale for $J/\psi$ production in the transverse momentum dependent framework

    hep-ph 2025-09 conditional novelty 6.0 of 10

    The paper derives new TMD soft transition functions and shows they dominate J/psi production at small transverse momentum by a factor of 1/v over previously used shape functions.

  2. $\psi(2S)$ production in jets using NRQCD

    hep-ph 2025-08 conditional novelty 6.0 of 10

    Applying NRQCD fragmenting jet functions and gluon-fragmentation-improved Pythia to psi(2S) in jets, the authors find that the LHCb data favor the Bodwin et al. LDME set and expose large tensions with other extractions.

  3. Probing nonperturbative transverse momentum dependent PDFs with chiral perturbation theory: the $\bar{d}-\bar{u}$ asymmetry

    hep-ph 2024-12 conditional novelty 6.0 of 10

    Chiral perturbation theory predicts an exponentially suppressed dbar minus ubar asymmetry in the proton's TMD PDFs at large transverse separation.

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