Double prompt $J/\psi$ hadroproduction in the parton Reggeization approach with BFKL resummation

He, Zhi-Guo; Saleev, Vladimir A.; Nefedov, Maxim A.; Kniehl, Bernd A.

Preprint/Report

PUBDB-2019-02665

Double prompt $J/\psi$ hadroproduction in the parton Reggeization approach with BFKL resummation

He, Z.-G.Extern* ; Kniehl, B. A. (Corresponding author)Extern* ; Nefedov, M. A.Extern* ; Saleev, V. A.

2019

[10.3204/PUBDB-2019-02665]

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Please use a persistent id in citations: doi:10.3204/PUBDB-2019-02665

Report No.: DESY-19-111; arXiv:1906.08979

Abstract: We study double prompt $J/\psi$ 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 $J/\psi$ meson and the $J/\psi$ pair. Already at leading order in $\alpha_s$, these predictions as well as those for the total cross section and its distributions in the invariant mass $m_{\psi\psi}$ and the rapidity separation $|Y|$ of the $J/\psi$ pair nicely agree with recent ATLAS and CMS measurements, except for the large-$m_{\psi\psi}$ and large-$|Y|$ 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.

Keyword(s): invariance: gauge ; radiation: initial-state interaction ; higher-order: 0 ; hadroproduction ; BFKL equation ; resummation ; parton ; Regge ; total cross section ; transverse momentum ; factorization ; initial state ; rapidity ; ATLAS ; meson ; CMS