Abstract
We report on the measurements of directed flow v1 and elliptic flow v2 for hadrons (π±, K±, KS0, p, ϕ, Λ and Ξ−) from Au+Au collisions at sNN=3 GeV and v2 for (π±, K±, p and p‾) at 27 and 54.4 GeV with the STAR experiment. While at the two higher energy midcentral collisions the number-of-constituent-quark (NCQ) scaling holds, at 3 GeV the v2 at midrapidity is negative for all hadrons and the NCQ scaling is absent. In addition, the v1 slopes at midrapidity for almost all observed hadrons are found to be positive, implying dominant repulsive baryonic interactions. The features of negative v2 and positive v1 slope at 3 GeV can be reproduced with a baryonic mean-field in transport model calculations. These results imply that the medium in such collisions is likely characterized by baryonic interactions.
Original language | English |
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Article number | 137003 |
Journal | Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics |
Volume | 827 |
DOIs | |
State | Published - Apr 10 2022 |
Bibliographical note
Publisher Copyright:© 2022 The Author(s)
Funding
We thank Drs. Y. Nara and J. Steinheimer for interesting discussions and the use of their JAM and UrQMD simulations codes. We thank the RHIC Operations Group and RCF at BNL, the NERSC Center at LBNL, and the Open Science Grid consortium for providing resources and support. This work was supported in part by the Office of Nuclear Physics within the U.S. DOE Office of Science , the U.S. National Science Foundation , the Ministry of Education and Science of the Russian Federation , National Natural Science Foundation of China , Chinese Academy of Science , the Ministry of Science and Technology of China and the Chinese Ministry of Education , the Higher Education Sprout Project by Ministry of Education at NCKU, the National Research Foundation of Korea , Czech Science Foundation and Ministry of Education, Youth and Sports of the Czech Republic, Hungarian National Research, Development and Innovation Office , New National Excellency Programme of the Hungarian Ministry of Human Capacities , Department of Atomic Energy and Department of Science and Technology of the Government of India, the National Science Centre of Poland, the Ministry of Science, Education and Sports of the Republic of Croatia, ROSATOM of Russia and German Bundesministerium f\u00FCr Bildung, Wissenschaft, Forschung und Technologie ( BMBF ), Helmholtz Association , Ministry of Education, Culture, Sports, Science and Technology (MEXT) and Japan Society for the Promotion of Science (JSPS).
Funders | Funder number |
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Hungarian Ministry of Human Capacities | |
National Research Foundation of Korea | |
Max Delbrück Center for Molecular Medicine in the Helmholtz Association | |
Ministry of Education of the People's Republic of China | |
Narodowe Centrum Nauki | |
Grantová Agentura České Republiky | |
National Science Foundation Arctic Social Science Program | |
Bundesministerium für Bildung und Forschung | |
Nemzeti Kutatási Fejlesztési és Innovációs Hivatal | |
Ministry for Education and Science of the Russian Federation | |
Ministry of Education at NCKU | |
Ministry of Science and Technology of the People's Republic of China | |
Department of Atomic Energy and Department of Science and Technology | |
Ministarstvo Obrazovanja, Znanosti i Sporta | |
Chinese Academy of Sciences | |
Office of Science Programs | |
Riley Children's Foundation | |
Institute for Nuclear Physics | |
Ministerstvo Školství, Mládeže a Tělovýchovy | |
RHIC Operations Group | |
Ministry of Education, Culture, Sports, Science and Technology | |
National Natural Science Foundation of China (NSFC) | |
Japan Society for the Promotion of Science | 19H05598 |
Japan Society for the Promotion of Science |
ASJC Scopus subject areas
- Nuclear and High Energy Physics