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.

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