Double prompt J/ψ hadroproduction in the parton Reggeization approach with high-energy resummation

• Main Authors: He, Zhi-Guo, Kniehl, Bernd A., Nefedov, Maxim A., Saleev, Vladimir A.
• Format: Dataset
• Language: English
• ISSN: 0031-9007; 1092-0145; 1079-7114
• DOI: 10.3204/pubdb-2019-04046

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.