Year: 2026
Type: preprint
Abstract: We study bottomonium $Υ$($n$S) production in ${\rm O}+{\rm O}$ collisions at $\sqrt{s_{NN}}=5.36$~TeV, including both cold nuclear-matter (CNM) effects and final-state interactions in a short-lived quark-gluon plasma. The CNM baseline is calculated using the EPPS21 nuclear parton distribution functions together with coherent energy loss and transverse momentum broadening. Hot-medium effects are evaluated with two transport approaches coupled to the same centrality-resolved 3+1D aHydroQP background: the QTRAJ-NLO open-quantum-system calculation, implemented with the {\sc QTraj} code, and the TAMU-NP semiclassical rates, including primordial suppression and regeneration. The CNM effects give a moderate, state-independent suppression, dominated by the nPDF modification. The energy loss and transverse momentum broadening contribution remains at the few-percent level. Both transport approaches predict a sequential suppression pattern, $R_{AA}^{Υ(1\rm{S})}>R_{AA}^{Υ(2\rm{S})}>R_{AA}^{Υ(3\rm{S})}$, with the strongest suppression around midrapidity in central collisions. The suppression of the ground state is similar in the two approaches but differs for the excited states. Since the CNM factor is common to all states, double ratios provide a direct measure of the relative hot-medium suppression. Our results support the conclusion that ${\rm O}+{\rm O}$ collisions at the LHC can produce a short-lived QGP capable of modifying bottomonium yields.
Source: arXiv (Cornell University)
Institution: Kent State University
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Awards: G1088636562, G122673668, G1286236842, G1356433355, G14554683, G1540256288, G1677143136, G1863003419, G2145270357, G2572101720, G2812149348, G2821925151, G2924680255, G3083819904, G3669113783, G419881185, G42916606, G4501827968, G4829302703, G498139845, G5076365615, G574795485, G6652958823, G697279732, Correlation Functions in QCD Matter, G8326222658, G895790057, G969889393, G991281326
OpenAlex ID: W7213423800