Fragmentation contributions to J/ψ photoproduction at HERA

Bodwin, Geoffrey T.; Chung, Hee Sok; Kim, U-Rae; Lee, Jungil

doi:10.1103/PhysRevD.92.074042

Title: Fragmentation contributions to $J / ψ$ photoproduction at HERA

Journal Article · Wed Oct 28 00:00:00 EDT 2015 · Physical Review. D, Particles, Fields, Gravitation and Cosmology

DOI:https://doi.org/10.1103/PhysRevD.92.074042· OSTI ID:1391859

Bodwin, Geoffrey T. ^[1]; Chung, Hee Sok ^[1]; Kim, U-Rae ^[2]; Lee, Jungil ^[2]

Argonne National Lab. (ANL), Argonne, IL (United States)
Korea Univ., Seoul (Korea)

Here, we compute leading-power fragmentation corrections to J/ψ photoproduction at DESY HERA, making use of the nonrelativistic QCD factorization approach. Our calculations include parton production cross sections through order α³_s, fragmentation functions though order α²_s, and leading logarithms of the transverse momentum divided by the charm-quark mass to all orders in α_s. We find that the leading-power fragmentation corrections, beyond those that are included through next-to-leading order in α_s, are small relative to the fixed-order contributions through next-to-leading order in α_s. Consequently, an important discrepancy remains between the experimental measurements of the J/ψ photoproduction cross section and predictions that make use of nonrelativistic-QCD long-distance matrix elements that are extracted from the J/ψ hadroproduction cross-section and polarization data.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: National Research Foundation of Korea (NRF); USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1391859

Alternate ID(s):: OSTI ID: 1224571

Journal Information:: Physical Review. D, Particles, Fields, Gravitation and Cosmology, Vol. 92, Issue 7; ISSN 1550-7998

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 8 works

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