Beam energy dependence of net-Lambda fluctuations measured by the STAR experiment at the BNL Relativistic Heavy Ion Collider
文献类型：期刊论文
| Author | Adam, J; Adamczyk, L; Adams, JR; Adkins, JK; Agakishiev, G; Aggarwal, MM; Ahammed, Z; Alekseev, I; Anderson, DM; Aoyama, R |
| Source | PHYSICAL REVIEW C
 |
| Issued Date | 2020 |
| Volume | 102Issue:2Pages:- |
| Keyword | FREEZE-OUT CONDITIONS MULTIPLICITY DISTRIBUTIONS CHARGE FLUCTUATIONS HIGHER MOMENTS COLLISIONS PROTON QCD |
| ISSN | 0556-2813 |
| DOI | 10.1103/PhysRevC.102.024903 |
| Subtype | 期刊论文 |
| English Abstract | The measurements of particle multiplicity distributions have generated considerable interest in understanding the fluctuations of conserved quantum numbers in the quantum chromodynamics (QCD) hadronization regime, in particular near a possible critical point and near the chemical freeze-out. Net-protons and net-kaons have been used as proxies for the net-baryon number and net-strangeness, respectively. We report the measurement of efficiency- and centrality-bin width-corrected cumulant ratios (C-2/C-1,C-3/C-3) of net-A distributions, in the context of both strangeness and baryon number conservation, as a function of collision energy, centrality, and rapidity. The results are for Au + Au collisions at five beam energies (root s(NN) = 19.6, 27, 39, 62.4, and 200 GeV) recorded with the Solenoidal Tracker at RHIC (STAR). We compare our results to the Poisson and negative binomial (NBD) expectations, as well as to ultrarelativistic quantum molecular dynamics (UrQMD) and hadron resonance gas (HRG) model predictions. Both NBD and Poisson baselines agree with data within the statistical and systematic uncertainties. UrQMD describes the measured net-A C-1 and C-3 at 200 GeV reasonably well but deviates from C-2, and the deviation increases as a function of collision energy. The ratios of the measured cumulants show no features of critical fluctuations. The chemical freeze-out temperatures extracted from a recent HRG calculation, which was successfully used to describe the net-proton, net-kaon, and net-charge data, indicate A freeze-out conditions similar to those of kaons. However, large deviations are found when comparing with temperatures obtained from net-proton fluctuations. The net-A cumulants show a weak but finite dependence on the rapidity coverage in the acceptance of the detector, which can be attributed to quantum number conservation. |
| Language | 英语 |
| 源URL | [http://ir.sinap.ac.cn/handle/331007/32726]  |
| Collection | 上海应用物理研究所_中科院上海应用物理研究所2011-2017年 |
| Affiliation | 1.Czech Tech Univ, FNSPE, Prague 11519, Czech Republic 2.Abilene Christian Univ, Abilene, TX 79699 USA 3.AGH Univ Sci & Technol, FPACS, PL-30059 Krakow, Poland 4.Alikhanov Inst Theoret & Expt Phys, Moscow 117218, Russia 5.Argonne Natl Lab, Argonne, IL 60439 USA 6.Amer Univ Cairo, Cairo, Egypt 7.Brookhaven Natl Lab, Upton, NY 11973 USA 8.Univ Calif Berkeley, Berkeley, CA 94720 USA 9.Univ Calif Davis, Davis, CA 95616 USA 10.Univ Calif Los Angeles, Los Angeles, CA 90095 USA |
| Recommended Citation GB/T 7714 | Adam, J,Adamczyk, L,Adams, JR,et al. Beam energy dependence of net-Lambda fluctuations measured by the STAR experiment at the BNL Relativistic Heavy Ion Collider[J]. PHYSICAL REVIEW C,2020,102(2):-. |
| APA | Adam, J.,Adamczyk, L.,Adams, JR.,Adkins, JK.,Agakishiev, G.,...&Zyzak, M.(2020).Beam energy dependence of net-Lambda fluctuations measured by the STAR experiment at the BNL Relativistic Heavy Ion Collider.PHYSICAL REVIEW C,102(2),-. |
| MLA | Adam, J,et al."Beam energy dependence of net-Lambda fluctuations measured by the STAR experiment at the BNL Relativistic Heavy Ion Collider".PHYSICAL REVIEW C 102.2(2020):-. |
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来源：上海应用物理研究所
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