Double Prompt J / ψ Hadroproduction in the Parton Reggeization Approach with High-Energy Resummation

We study double prompt J/ψ hadroproduction within the nonrelativistic-QCD factorization formalism adopting the parton Reggeization approach to treat initial-state radiation in a gauge invariant and infrared-safe way. We present first predictions for the cross section distributions in the transverse...

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Bibliographic Details
Published in:Physical review letters 2019-10, Vol.123 (16), p.1-162002, Article 162002
Main Authors: He, Zhi-Guo, Kniehl, Bernd A., Nefedov, Maxim A., Saleev, Vladimir A.
Format: Article
Language:English
Subjects:
Cross-sections
Invariants
Partons
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Summary:We study double prompt J/ψ hadroproduction within the nonrelativistic-QCD factorization formalism adopting the parton Reggeization approach to treat initial-state radiation in a gauge invariant and infrared-safe way. We present first predictions for the cross section distributions in the transverse momenta of the subleading J/ψ meson and the J/ψ pair. Already at leading order in αs, these predictions as well as those for the total cross section and its distributions in the invariant mass mψψ and the rapidity separation |Y| of the J/ψ pair nicely agree with recent ATLAS and CMS Collaboration measurements, except for the large-mψψ and large−|Y| regions, where the predictions substantially undershoot the data. In the latter regions, Balitsky-Fadin-Kuraev-Lipatov resummation is shown to enhance the cross sections by up to a factor of 2 and so to improve the description of the data.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.123.162002