Abstract

Flow coefficients (v2 and v3 ) are measured in high-multiplicity p + Au, d + Au, and 3 He + Au collisions at a center-of-mass energy of √s NN = 200 GeV using the STAR detector. The measurements utilize two-particle correlations with a pseudorapidity requirement of |η| < 0.9 and a pair gap of |Δη| > 1.0. The primary focus is on analysis methods, particularly the subtraction of nonflow contributions. Four established nonflow subtraction methods are applied to determine vn, validated using the HIJING event generator. vn values are compared across the three collision systems at similar multiplicities; this comparison cancels the final-state effects and isolates the impact of initial geometry. While v2 values show differences among these collision systems, v3 values are largely similar, consistent with expectations of subnucleon fluctuations in the initial geometry. The ordering of vn differs quantitatively from previous measurements using two-particle correlations with a larger rapidity gap, which, according to model calculations, can be partially attributed to the effects of longitudinal flow decorrelations. The prospects for future measurements to improve our understanding of flow decorrelation and subnucleonic fluctuations are also discussed.

Document Type

Article

Publication Date

2024

Notes/Citation Information

©2024 American Physical Society

Digital Object Identifier (DOI)

https://doi.org/10.1103/PhysRevC.110.064902

Funding Information

We thank the RHIC Operations Group and SDCC 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; 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 and WUT ID-UB of Poland; the Ministry of Science, Education and Sports of the Republic of Croatia; German Bundesministerium für Bildung, Wissenschaft, Forschung and Technologie (BMBF); Helmholtz Association; Ministry of Education, Culture, Sports, Science, and Technology (MEXT); Japan Society for the Promotion of Science (JSPS); and Agencia Nacional de Investigación y Desarrollo (ANID) of Chile.

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