Role of bulk viscosity in deuteron production in ultrarelativistic nuclear collisions

We use a Bayesian-calibrated multistage viscous hydrodynamic model to explore deuteron yield, mean transverse momentum and flow observables in LHC Pb-Pb collisions. We explore theoretical uncertainty in the production of deuterons, including (i) the contribution of thermal deuterons, (ii) models for...

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Bibliographic Details
Published in:arXiv.org 2022-03
Main Authors: Everett, D, Oliinychenko, D, Luzum, M, J -F Paquet, Vujanovic, G, Bass, S A, L Du, Gale, C, Heffernan, M, Heinz, U, Kasper, L, W Ke, Liyanage, D, Majumder, A, Mankolli, A, Shen, C, Soeder, D, Velkovska, J, Angerami, A, Arora, R, Cao, S, Chen, Y, Dai, T, Ehlers, R, Elfner, H, Fan, W, Fries, R J, Garza, F, Y He, Jacak, B V, Jacobs, P M, Jeon, S, Kelsey, M, Kordell, M, Kumar, A, Latessa, J, Y -J Lee, Lopez, A, Mak, S, Martin, C, Mehryar, H, Mengel, T, Mulligan, J, Nattrass, C, Putschke, J H, Roland, G, Schenke, B, Schwiebert, L, Silva, A, Sirimanna, C, Soltz, R A, Staudenmaier, J, Strickland, M, Tachibana, Y, X -N Wang, Wolpert, R L, Collaboration, JETSCAPE
Format: Article
Language:English
Subjects:
Atomic collisions
Coalescing
Deuterons
Physical properties
Sensitivity
Transverse momentum
Uncertainty
Viscosity
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Summary:We use a Bayesian-calibrated multistage viscous hydrodynamic model to explore deuteron yield, mean transverse momentum and flow observables in LHC Pb-Pb collisions. We explore theoretical uncertainty in the production of deuterons, including (i) the contribution of thermal deuterons, (ii) models for the subsequent formation of deuterons (hadronic transport vs coalescence) and (iii) the overall sensitivity of the results to the hydrodynamic model -- in particular to bulk viscosity, which is often neglected in studies of deuteron production. Using physical parameters set by a comparison to only light hadron observables, we find good agreement with measurements of the mean transverse momentum \(\langle p_T \rangle\) and elliptic flow \(v_2\) of deuterons; however, tension is observed with experimental data for the deuteron multiplicity in central collisions. The results are found to be sensitive to each of the mentioned theoretical uncertainties, with a particular sensitivity to bulk viscosity, indicating that the latter is an important ingredient for an accurate treatment of deuteron production.
ISSN:2331-8422
DOI:10.48550/arxiv.2203.08286