The first (v1fluc), second (v2), and third (v3) harmonic coefficients of the azimuthal particle distribution at midrapidity are extracted for charged hadrons and studied as a function of transverse momentum (pT) and mean charged particle multiplicity density Nch in U+U (sNN=193 GeV), Au+Au, Cu+Au, Cu+Cu, d+Au, and p+Au collisions at sNN=200 GeV with the STAR detector. For the same Nch, the v1fluc and v3 coefficients are observed to be independent of the collision system, while v2 exhibits such a scaling only when normalized by the initial-state eccentricity (μ2). The data also show that ln(v2/μ2) scales linearly with Nch-1/3. These measurements provide insight into initial-geometry fluctuations and the role of viscous hydrodynamic attenuation on vn from small to large collision systems.

Azimuthal Harmonics in Small and Large Collision Systems at RHIC Top Energies / Adam, J., Adamczyk, L., Adams, J.R., Adkins, J.K., Agakishiev, G., Aggarwal, M.M., Ahammed, Z., Alekseev, I., Anderson, D.M., Aoyama, R., Aparin, A., Arkhipkin, D., Aschenauer, E.C., Ashraf, M.U., Atetalla, F., Attri, A., Averichev, G.S., Bai, X., Bairathi, V., Barish, K., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 122:17(2019), pp. 172301.--172301.-. [10.1103/PhysRevLett.122.172301]

Azimuthal Harmonics in Small and Large Collision Systems at RHIC Top Energies

Contin G.;
2019-01-01

Abstract

The first (v1fluc), second (v2), and third (v3) harmonic coefficients of the azimuthal particle distribution at midrapidity are extracted for charged hadrons and studied as a function of transverse momentum (pT) and mean charged particle multiplicity density Nch in U+U (sNN=193 GeV), Au+Au, Cu+Au, Cu+Cu, d+Au, and p+Au collisions at sNN=200 GeV with the STAR detector. For the same Nch, the v1fluc and v3 coefficients are observed to be independent of the collision system, while v2 exhibits such a scaling only when normalized by the initial-state eccentricity (μ2). The data also show that ln(v2/μ2) scales linearly with Nch-1/3. These measurements provide insight into initial-geometry fluctuations and the role of viscous hydrodynamic attenuation on vn from small to large collision systems.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11368/2964922
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