Investigation of suppression of Υ(nS) in relativistic heavy-ion collisions at RHIC and LHC energies
arxiv(2024)
摘要
The primary purpose of studying quarkonium production in relativistic
heavy-ion collisions is to understand the properties of the quark-gluon plasma.
At various collision systems, measurements of quarkonium states of different
binding energies, such as Υ(nS), can provide comprehensive
information. A model study has been performed to investigate the modification
of Υ(nS) production in Pb-Pb collisions at √(s_NN)=
5.02 TeV and Au-Au collisions at √(s_NN)= 200 GeV. The
Monte-Carlo simulation study is performed with a publicly available
hydrodynamic simulation package for the quark-gluon plasma medium and a
theoretical calculation of temperature-dependent thermal width of
Υ(nS) considering the gluo-dissociation and inelastic parton
scattering for dissociation inside the medium. In addition, we perform a
systematic study with different descriptions of initial collision geometry and
formation time of Υ(nS) to investigate their impacts on yield
modification. The model calculation with a varied parameter set can describe
the experimental data of Υ(nS) in Pb-Pb collisions at 5.02 TeV and
Υ(2S) in Au-Au collisions at 200 GeV but underestimates the
modification of Υ(1S) at the lower collision energy. The nuclear
absorption mechanism is explored to understand the discrepancy between the data
and simulation.
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