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

Zhi-Guo He; B. Kniehl; M. Nefedov; V. Saleev

Paper

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

Abstract

We study double prompt

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

meson and the

pair. Already at leading order in

, these predictions as well as those for the total cross section and its distributions in the invariant mass

and the rapidity separation

of the

pair nicely agree with recent ATLAS and CMS measurements, except for the large-

and large-

regions, where the predictions substantially undershoot the data. In the latter regions, BFKL resummation is shown to enhance the cross sections by up to a factor of two and so to improve the description of the data.