Cumulants and correlation functions of net-proton, proton, and antiproton multiplicity distributions in Au plus Au collisions at energies available at the BNL Relativistic Heavy Ion Collider

0545038 - ÚJF 2022 RIV US eng J - Journal Article
Abdallah, M. S. - Adam, J. - Adamczyk, L. - Adams, J. R. - Adkins, J. K. - Agakishiev, G. - 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 390 authors
Cumulants and correlation functions of net-proton, proton, and antiproton multiplicity distributions in Au plus Au collisions at energies available at the BNL Relativistic Heavy Ion Collider.
Physical Review C. Roč. 104, č. 2 (2021), č. článku 024902. ISSN 2469-9985. E-ISSN 2469-9993
R&D Projects: GA MŠMT LTT18002
Research Infrastructure: BNL-CZ II - 90109
Institutional support: RVO:61389005
Keywords : STAR collaboration * Beam Energy Scan program * heavy ion collision
OECD category: Particles and field physics
Impact factor: 3.199, year: 2021
Method of publishing: Limited access
https://doi.org/10.1103/PhysRevC.104.024902

We report a systematic measurement of cumulants, C-n, for net-proton, proton, and antiproton multiplicity distributions, and correlation functions, kappa(n), for proton and antiproton multiplicity distributions up to the fourth order in Au+Au collisions at root s(NN) = 7.7, 11.5, 14.5, 19.6, 27, 39, 54.4, 62.4, and 200 GeV. The C-n and kappa(n) are presented as a function of collision energy, centrality and kinematic acceptance in rapidity, y, and transverse momentum, pT. The data were taken during the first phase of the Beam Energy Scan (BES) program (2010-2017) at the BNL Relativistic Heavy Ion Collider (RHIC) facility. The measurements are carried out at midrapidity (vertical bar y vertical bar < 0.5) and transverse momentum 0.4 < p(T) < 2.0 GeV/c, using the STAR detector at RHIC. We observe a nonmonotonic energy dependence (root s(NN) = 7.7-62.4 GeV) of the net-proton C-4/C-2 with the significance of 3.1 sigma for the 0-5% central Au+Au collisions. This is consistent with the expectations of critical fluctuations in a QCD-inspired model. Thermal and transport model calculations show a monotonic variation with root s(NN). For the multiparticle correlation functions, we observe significant negative values for a two-particle correlation function, kappa(2), of protons and antiprotons, which are mainly due to the effects of baryon number conservation. Furthermore, it is found that the four-particle correlation function, kappa(4), of protons plays a role in determining the energy dependence of proton C-4/C-1 below 19.6 GeV, which cannot be understood by the effect of baryon number conservation.
Permanent Link: http://hdl.handle.net/11104/0321812