Abstract

Angular distributions of charged particles relative to jet axes are studied in √s NN = 200 GeV Au+Au collisions as a function of the jet orientation with respect to the event plane. This differential study tests the expected path-length dependence of energy loss experienced by a hard-scattered parton as it traverses the hot and dense medium formed in heavy-ion collisions. A second-order event plane is used in the analysis as an experimental estimate of the reaction plane formed by the collision impact parameter and the beam direction. Charged-particle jets with 15 < pT,jet < 20 and 20 < pT,jet < 40 GeV/c were reconstructed with the anti-kT algorithm with radius parameter setting of R = 0.4 in the 20–50% centrality bin to maximize the initial-state eccentricity of the interaction region. The reaction plane fit method is implemented to remove the flow-modulated background with better precision than prior methods. Yields and widths of jet-associated charged-hadron distributions are extracted in three angular bins between the jet axis and the event plane. The event-plane (EP) dependence is further quantified by ratios of the associated yields in different EP bins. No dependence on orientation of the jet axis with respect to the event plane is seen within the uncertainties in the kinematic regime studied. This finding is consistent with a similar experimental observation by ALICE in √s NN = 2.76 TeV Pb-Pb collision data.

Document Type

Article

Publication Date

2024

Notes/Citation Information

©2024 American Physical Society

Digital Object Identifier (DOI)

https://doi.org/10.1103/PhysRevC.109.044909

Funding Information

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 and the U.S. National Science Foundation; the National Natural Science Foundation of China, the 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 and the National Research Foundation of Korea; the Czech Science Foundation and Ministry of Education, Youth and Sports of the Czech Republic; Hungarian National Research, Development and Innovation Office and the New National Excellency Programme of the Hungarian Ministry of Human Capacities; the 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; the 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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