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Measurements of dihadron correlations relative to the event plane in Au plus Au collisions at root s(NN)=200 GeV
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SYSNO ASEP 0541445 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Measurements of dihadron correlations relative to the event plane in Au plus Au collisions at root s(NN)=200 GeV Author(s) Agakishiev, G. (RU)
Aggarwall, M.M. (IN)
Ahammed, Z. (US)
Alakhverdyants, A. V. (RU)
Bielčík, J. (CZ)
Bielčíková, Jana (UJF-V) RID, ORCID, SAI
Chaloupka, Petr (UJF-V) RID
Chung, Paul (UJF-V)
Rusňáková, O. (CZ)
Kapitán, Jan (UJF-V)
Krus, M. (CZ)
Kushpil, Vasilij (UJF-V) ORCID, SAI
Pachr, M. (CZ)
Rusňák, Jan (UJF-V) RID, ORCID, SAI
Šumbera, Michal (UJF-V) RID, ORCID, SAI
Tlustý, Pavel (UJF-V) ORCID, SAINumber of authors 370 Article number 044002 Source Title Chinese Physics C. - : Institute of Physics Publishing - ISSN 1674-1137
Roč. 45, č. 4 (2021)Number of pages 44 s. Publication form Print - P Language eng - English Country GB - United Kingdom Keywords STAR collaboration ; relativistic heavy ion collisions ; dihadron correlations ; jet-medium interactions ; anisotropic flow background ; event plane Subject RIV BG - Nuclear, Atomic and Molecular Physics, Colliders OECD category Nuclear physics R&D Projects LTT18002 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) LA09013 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) GA13-20841S GA ČR - Czech Science Foundation (CSF) Method of publishing Limited access Institutional support UJF-V - RVO:61389005 UT WOS 000631365200001 EID SCOPUS 85103504473 DOI 10.1088/1674-1137/abdf3f Annotation Dihadron azimuthal correlations containing a high transverse momentum (p(T)) trigger particle are sensitive to the properties of the nuclear medium created at RHIC through the strong interactions occurring between the traversing parton and the medium, i.e. jet-quenching. Previous measurements revealed a strong modification to dihadron azimuthal correlations in Au+Au collisions with respect to p+p and d+Au collisions. The modification increases with the collision centrality, suggesting a path-length or energy density dependence to the jet-quenching effect. This paper reports STAR measurements of dihadron azimuthal correlations in mid-central (20%-60%) Au+Au collisions at root s(NN)= 200 GeV as a function of the trigger particle's azimuthal angle relative to the event plane, phi(s) = vertical bar phi(t) - psi(EP)vertical bar .The azimuthal correlation is studied as a function of both the trigger and associated particle p(T). The subtractions of the combinatorial background and anisotropic flow, assuming Zero Yield At Minimum (ZYAM), are described. The correlation results are first discussed with subtraction of the even harmonic (elliptic and quadrangular) flow backgrounds. The away-side correlation is strongly modified, and the modification varies with phi(s), with a double-peak structure for out-of-plane trigger particles. The near-side ridge (long range pseudo-rapidity Delta(eta) correlation) appears to drop with increasing phi(s) while the jet-like component remains approximately constant. The correlation functions are further studied with the subtraction of odd harmonic triangular flow background arising from fluctuations. It is found that the triangular flow, while responsible for the majority of the amplitudes, is not sufficient to explain the phi(s)-dependence of the ridge or the away-side double-peak structure. The dropping ridge with phi(s), could be attributed to a phi(s)-dependent elliptic anisotropy. however, the physics mechanism of the ridge remains an open question. Even with a phi(s)-dependent elliptic flow, the away-side correlation structure is robust. These results, with extensive systematic studies of the dihadron correlations as a function of phi(s), trigger and associated particle p(T), and the pseudo-rapidity range Delta(eta), should provide stringent inputs to help understand the underlying physics mechanisms of jet-medium interactions in high energy nuclear collisions. Workplace Nuclear Physics Institute Contact Markéta Sommerová, sommerova@ujf.cas.cz, Tel.: 266 173 228 Year of Publishing 2022 Electronic address https://doi.org/10.1088/1674-1137/abdf3f
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