Measurement of cold nuclear matter effects for inclusive J/ψ in p + Au collisions at √s.sub.NN./sub. = 200 GeV

0556874 - ÚJF 2023 RIV NL eng J - Journal Article
Abdallah, M. S. - Aboona, B. E. - Adam, J. - Adamczyk, L. - Bielčík, J. - Bielčíková, Jana - Federič, Pavol - Holub, L. - Chaloupka, P. - Kosarzewski, L. K. - Kramárik, L. - Líčeník, Robert - Ponimatkin, Georgij - Prozorova, V. - Robotková, Monika - Rusňák, Jan - Šimko, Miroslav - Šumbera, Michal - Truhlář, T. - Trzeciak, B. A. - Vaněk, Jan … Total 382 authors
Measurement of cold nuclear matter effects for inclusive J/ψ in p + Au collisions at √s_NN = 200 GeV.
Physics Letters. B. Roč. 825, FEB (2022), č. článku 136865. ISSN 0370-2693. E-ISSN 1873-2445
R&D Projects: GA MŠMT LTT18002
Research Infrastructure: BNL-CZ II - 90109
Institutional support: RVO:61389005
Keywords : STAR collaboration * RHIC * cold nuclear matter effects
OECD category: Nuclear physics
Impact factor: 4.3, year: 2022
Method of publishing: Open access
https://doi.org/10.1016/j.physletb.2021.136865

Measurement by the STAR experiment at RHIC of the cold nuclear matter (CNM) effects experienced by inclusive J/psi at mid-rapidity in 0-100% p+Au collisions at root s(NN) = 200 GeV is presented. Such effects are quantified utilizing the nuclear modification factor, R-pAu, obtained by taking a ratio of J/* yield in p+Au collisions to that in p+p collisions scaled by the number of binary nucleon-nucleon collisions. The differential J/psi yield in both p+p and p+Au collisions is measured through the dimuon decay channel, taking advantage of the trigger capability provided by the Muon Telescope Detector in the RHIC 2015 run. Consequently, the J/psi R-pAu is derived within the transverse momentum (p(T)) range of 0 to 10 GeV/c. A suppression of approximately 30% is observed for p(T) <= 2 GeV/c, while J/psi R-pAu becomes compatible with unity for p(T) greater than 3 GeV/c, indicating the J/psi yield is minimally affected by the CNM effects at high p(T). Comparison to a similar measurement from 0-20% central Au+Au collisions reveals that the observed strong J/psi suppression above 3 GeV/c is mostly due to the hot medium effects, providing strong evidence for the formation of the quark-gluon plasma in these collisions. Several model calculations show qualitative agreement with the measured J/psi R-pAu, while their agreement with the J/psi yields in p+p and p+Au collisions is worse.
Permanent Link: http://hdl.handle.net/11104/0330986