Elliptic flow of identified hadrons in Au+Au collisions at √sNN=7.7–62.4 GeV

Scientific paper - Original scientific paper

• Author: L. Adamczyk
• Author: ...
• Author: Mirko Planinić
• Author: ...
• Author: Nikola Poljak
• Author: ...
• Author: M. Zyzak
• Collaboration: STAR Collaboration
• Author's institution: University of Zagreb; Faculty of Science; (Department of Physics)
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Physics

Abstract (english)

Measurements of the elliptic flow, v2, of identified hadrons (π±, K ±, K0s, p, p¯, ϕ, Λ, Λ¯, Ξ−, Ξ¯+, Ω−, Ω¯+) in Au+Au collisions at √sNN= 7.7, 11.5, 19.6, 27, 39 and 62.4 GeV are presented. The measurements were done at mid-rapidity using the Time Projection Chamber and the Time-of-Flight detectors of the STAR experiment during the Beam Energy Scan program at RHIC. A significant difference in the v2 values for particles and the corresponding anti-particles was observed at all transverse... More momenta for the first time. The difference increases with decreasing center-of-mass energy, √sNN (or increasing baryon chemical potential, μB) and is larger for the baryons as compared to the mesons. This implies that particles and anti-particles are no longer consistent with the universal number-of-constituent quark (NCQ) scaling of v2 that was observed at √sNN= 200 GeV. However, for the group of particles NCQ scaling at (mT−m0)/nq> 0.4 GeV/c2 is not violated within ±10%. The v2 values for ϕ mesons at 7.7 and 11.5 GeV are approximately two standard deviations from the trend defined by the other hadrons at the highest measured pT values. Less

• Keywords (english): elliptic flow; hadrons; AuAu; STAR
• Language: english
• Publication type: Scientific paper - Original scientific paper
• Publication status: Published
• Peer review: Peer review - international
• Publication version: Published version
• Journal title: Physical Review C - Nuclear Physics
• Numbering: vol. 88, no. 1, 014902
• p-ISSN: 0556-2813
• e-ISSN: 1089-490X
• DOI: https://doi.org/10.1103/PhysRevC.88.014902
• URN:NBN: urn:nbn:hr:217:891203
• Publication: 2013
• Project: Number: 119-0982887-1006; Title (croatian): Istraživanje hadronskih sustava upotrebom relativističkih projektila; Leader: Mirko Planinić; Jurisdiction: Croatia; Funding stream: ZP
• Document URL: https://journals.aps.org/prc/abstract/10.1103/PhysRevC.88.014902
• Type of resource: Text
• Access conditions: Open access
• Public note: Copyright (2013) by the American Physical Society. Received 10 January 2013; published 3 July 2013.
• Created on: 2019-11-26 15:42:36