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Flow and interferometry results from Au+Au collisions at sNN=4.5 GeV
- Source :
- Physical Review C. 103
- Publication Year :
- 2021
- Publisher :
- American Physical Society (APS), 2021.
-
Abstract
- The beam energy scan (BES) program at the BNL Relativistic Heavy Ion Collider (RHIC) was extended to energies below sNN=7.7 GeV in 2015 by successful implementation of the fixed-target mode of operation in the STAR (Solenoidal Tracker At RHIC) experiment. In this mode, ions circulate in one ring of the collider and interact with a stationary target at the entrance of the STAR time projection chamber. The first results for Au+Au collisions at sNN=4.5 GeV are presented, demonstrating good performance of all the relevant detector subsystems in fixed-target mode. Results presented here include directed and elliptic flow of identified hadrons, and radii from pion femtoscopy. The latter, together with recent HADES results, reveal a long-sought peak structure that may be caused by the system evolving through a first-order phase transition from quark-gluon plasma to the hadronic phase. Directed and elliptic flow for pions are presented for the first time at this beam energy. Pion and proton elliptic flow show behavior which hints at constituent quark scaling, and demonstrate that a definitive conclusion will be achievable using the full statistics of the ongoing second phase of BES (BES-II). In particular, BES-II to date has recorded fixed-target data sets with two orders of magnitude more events at each of nine energies between sNN=3.0 and 7.7 GeV.
- Subjects :
- Physics
Time projection chamber
Proton
010308 nuclear & particles physics
Hadron
Elliptic flow
Constituent quark
01 natural sciences
law.invention
Nuclear physics
Pion
law
0103 physical sciences
High Energy Physics::Experiment
Nuclear Experiment
010306 general physics
Collider
Relativistic Heavy Ion Collider
Subjects
Details
- ISSN :
- 24699993 and 24699985
- Volume :
- 103
- Database :
- OpenAIRE
- Journal :
- Physical Review C
- Accession number :
- edsair.doi...........f7829d7e897a8f9f6326f07fc2e00783