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How to include exclusive J/ψ production data in global PDF analyses

Flett, C. A.; Jones, S. P.; Martin, A. D.; Ryskin, M. G.; Teubner, T.

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Authors

C. A. Flett

S. P. Jones

M. G. Ryskin

T. Teubner



Abstract

We compare the cross section for exclusive J=ψ photoproduction calculated at next-to-leading order (NLO) in the collinear factorization approach with HERA and LHCb data. Using the optimum scale formalism together with the subtraction of the low kt contribution (below the input scale Q0) from the NLO coefficient function to avoid double counting, we show that the existing global parton distribution functions (PDFs) are consistent with the data within their uncertainties. This is the first time that J=ψ production data at HERA were successfully described within the NLO collinear factorization framework using the PDFs of the global parton analyses. However, at lower x the uncertainties of the present global PDFs are large. On the other hand, the accuracy of the LHCb data are rather good. Therefore, these data provide the possibility to directly measure the gluon PDF over the very large interval of x, 10−6

Citation

Flett, C., Jones, S., Martin, A., Ryskin, M., & Teubner, T. (2020). How to include exclusive J/ψ production data in global PDF analyses. Physical Review D, 101(9), Article 094011. https://doi.org/10.1103/physrevd.101.094011

Journal Article Type Article
Acceptance Date Apr 27, 2020
Online Publication Date May 13, 2020
Publication Date May 1, 2020
Deposit Date May 15, 2020
Publicly Available Date May 15, 2020
Journal Physical Review D
Print ISSN 2470-0010
Electronic ISSN 2470-0029
Publisher American Physical Society
Peer Reviewed Peer Reviewed
Volume 101
Issue 9
Article Number 094011
DOI https://doi.org/10.1103/physrevd.101.094011
Public URL https://durham-repository.worktribe.com/output/1270580

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Publisher Licence URL
http://creativecommons.org/licenses/by/4.0/

Copyright Statement
Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.






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