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Probing nonrelativistic QCD factorization in polarized J/psi photoproduction at next-to-leading order

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arxiv 1109.1476 v2 pith:XCDQI6SR submitted 2011-09-07 hep-ph hep-ex

Mathias Butenschoen , Bernd A. Kniehl This is my paper · ORCID
classification hep-phhep-ex
keywords factorizationnrqcdnext-to-leadingnonrelativisticorderphotoproductionpolarizationquantum
verification ladder T0 review T1 audit T2 compute T3 formal
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We analyze the polarization observables of J/psi photoproduction at next-to-leading order (NLO) within the factorization formalism of nonrelativistic quantum chromodynamics (NRQCD). This is the first NLO study of heavy-quarkonium polarization including the full relativistic corrections due to the intermediate ^1S_0^{[8]}, ^3S_1^{[8]}, and ^3P_J^{[8]} color-octet (CO) states in the worldwide endeavor to test NRQCD factorization at the quantum level. We present theoretical predictions in the helicity, target, and Collins-Soper frames of DESY HERA, evaluated using the CO long-distance matrix elements previously extracted through a global fit to experimental data of unpolarized J/psi production, and confront them with recent measurements by the H1 and ZEUS Collaborations. We find the overall agreement to be satisfactory, but the case for NRQCD to be not as strong as for the J/psi yield.

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Cited by 2 Pith papers

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

  1. Probing Heavy-Quark Spin Symmetry in Double $J/\psi$ Hadroproduction

    hep-ph 2026-08 conditional novelty 8.0 of 10

    A complete O(alpha_s^5) NRQCD calculation for prompt J/psi pair hadroproduction finds LHC data fix one combination of color-octet LDMEs, yielding a set that tests heavy-quark spin symmetry via eta_c data.

  2. How well does nonrelativistic QCD factorization work at next-to-leading order?

    hep-ph 2024-11 conditional novelty 6.0 of 10

    A single set of NRQCD color-octet matrix elements fitted to LHC J/psi and eta_c data predicts a wide range of quarkonium observables, including Upsilon(3S) production and low-momentum photoproduction, with residual fa...

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