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Correlations between heavy mesons and the creation of the charmonia, bottomonia, and Bc mesons in high energy pp collisions

Jiaxing Zhao1,2,3, Joerg Aichelin1, Pol Bernard Gossiaux1, and Klaus Werner1

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Phys. Rev. D 113, 116022 – Published 16 June, 2026

DOI: https://doi.org/10.1103/6c95-5r3p

Abstract

The different QCD processes, which can produce a heavy quark-antiquark (QQ¯) pair, induce different correlations between the heavy quarks. Employing the epos4hq event generator, we study the consequences of these correlations and compare the calculation with experimental results on open and hidden heavy flavor mesons, measured in proton-proton (pp) collisions at RHIC and LHC energies. We find that the measured correlations between heavy mesons are a direct image of the different ways in which the heavy quark pair is produced. They also contribute differently to the transverse momentum distribution of open and hidden heavy flavor mesons. The latter are calculated in a Wigner density approach, which also enables us to reproduce quantitatively the measured Bc spectra. This agreement allows conclusions on the spatial distribution of the heavy quark creation processes.

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Phys. Rev. D 113, 116022– Published 16 June, 2026
  • Received 22 November 2025
  • Accepted 30 April 2026
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.

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