Charmonia production from $b$-hadron decays at LHC with $k_T$-factorization: $J/\psi$, $\psi(2S)$ and $J/\psi + Z$

Lipatov, A. V.; Jung, H.; Baranov, S. P.; Malyshev, M. A.

Preprint/Report

PUBDB-2017-12126

Charmonia production from $b$-hadron decays at LHC with $k_T$-factorization: $J/\psi$, $\psi(2S)$ and $J/\psi + Z$

Lipatov, A. V. (Corresponding author)Extern* ; Baranov, S. P. ; Jung, H. ; Malyshev, M. A.

2017

[10.3204/PUBDB-2017-12126]

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Please use a persistent id in citations: doi:10.3204/PUBDB-2017-12126

Report No.: DESY-17-196; arXiv:1711.05625

Abstract: We consider the production of $J/\psi$ and $\psi(2S)$ mesons originating from the decays of $b$-flavored hadrons at the LHC using the $k_T$-factorization approach. Our analysis covers both inclusive charmonia production and production of $J/\psi$ mesons in association with $Z$ bosons. We apply the transverse momentum dependent (or unintegrated) gluon density in a proton derived from Catani-Ciafaloni-Fiorani-Marchesini (CCFM) evolution equation and adopt fragmentation functions based on the non-relativistic QCD factorization to describe the inclusive $b$-hadron decays into the different charmonium states. Our predictions agree well with latest experimental data taken by the CMS, ATLAS and LHCb Collaborations at $\sqrt s = 7$, $8$ and $13$~TeV. The contributions from double parton scattering to the associated non-prompt $J/\psi + Z$ production are estimated and found to be small.

Note: *Temporary entry*12 pages, 5 figures

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