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    Semiclassical treatment of bottomonium suppression and regeneration in p+Pb collisions

    Sabin Thapa1, Biaogang Wu2, Ramona Vogt3,4, and Ralf Rapp2

    Phys. Rev. D 113, 056006 – Published 4 March, 2026

    DOI: https://doi.org/10.1103/2631-zhtw

    Abstract

    We study bottomonium suppression in p+Pb relative to p+p collisions at center-of-mass energies of sNN=5.02 and 8.16 TeV. Specifically, we combine cold nuclear matter effects (nuclear modifications of the parton densities, energy loss, and momentum broadening) with those from hot nuclear matter (suppression and regeneration) by implementing the formation of a quark-gluon plasma in hydrodynamic simulations. Bottomonium transport in the quark-gluon plasma is evaluated semiclassically, employing two different reaction rates. The first includes quasifree inelastic scattering and gluodissociation employing a perturbative coupling to the medium. The second is based on in-medium T-matrix calculations where the input potential is constrained by lattice quantum chromodynamics to extract the bottomonium masses and dissociation rates. These semiclassical results are compared to previous calculations in an open quantum system approach and to the experimental data. Predictions for χb suppression at sNN=8.16  TeV are also presented.

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