2019, Adamczyk, L., Adkins, J. K., Agakishiev, G., Aggarwal, M. M., Alekseev, I., Brandin, A. V., Kochenda, L., Kravtsov, P., Nigmatkulov, G., Okorokov, V. A., Strikhanov, M., Taranenko, A., Алексеев, Игорь Геннадьевич, Брандин, Андрей Владимирович, Нигматкулов, Григорий Александрович, Окороков, Виталий Алексеевич, Стриханов, Михаил Николаевич, Тараненко, Аркадий Владимирович

© 2018 The Author We present three-particle mixed-harmonic correlations 〈cos⁡(mϕa+nϕb−(m+n)ϕc)〉 for harmonics m,n=1−3 for charged particles in sNN=200 GeV Au+Au collisions at RHIC. These measurements provide information on the three-dimensional structure of the initial collision zone and are important for constraining models of a subsequent low-viscosity quark–gluon plasma expansion phase. We investigate correlations between the first, second and third harmonics predicted as a consequence of fluctuations in the initial state. The dependence of the correlations on the pseudorapidity separation between particles show hints of a breaking of longitudinal invariance. We compare our results to a number of state-of-the art hydrodynamic calculations with different initial states and temperature dependent viscosities. These measurements provide important steps towards constraining the temperature dependent viscosity and longitudinal structure of the initial state at RHIC.

2023, Aboona, B. E., Adam, J., Adams, J. R., Agakishiev, G., Alekseev I., Brandin A. V., Kochenda L., Kravtsov P., Nigmatkulov G., Okorokov V. A., Parfenov P., Strikhanov M., Taranenko A., Vasiliev A. N., Алексеев, Игорь Геннадьевич, Брандин, Андрей Владимирович, Нигматкулов, Григорий Александрович, Окороков, Виталий Алексеевич, Парфенов, Петр Евгеньевич, Стриханов, Михаил Николаевич, Тараненко, Аркадий Владимирович, Васильев, Александр Николаевич

2023, Aboona, B. E., Adam, J., Adams, J. R., Agakishiev, G., Alekseev I., Brandin A. V., Kochenda L., Kravtsov P., Nigmatkulov G., Okorokov V. A., Parfenov P., Strikhanov M., Taranenko A., Vasiliev A. N., Алексеев, Игорь Геннадьевич, Брандин, Андрей Владимирович, Нигматкулов, Григорий Александрович, Окороков, Виталий Алексеевич, Парфенов, Петр Евгеньевич, Стриханов, Михаил Николаевич, Тараненко, Аркадий Владимирович, Васильев, Александр Николаевич

The linear and mode-coupled contributions to higher-order anisotropic flow are presented for Au+Au collisions at sNN = 27, 39, 54.4, and 200 GeV and compared to similar measurements for Pb+Pb collisions at the Large Hadron Collider (LHC). The coefficients and the flow harmonics correlations, which characterize the linear and mode-coupled response to the lower-order anisotropies, indicate a beam energy dependence consistent with an influence from the specific shear viscosity (О·/s). In contrast, the dimensionless coefficients, mode-coupled response coefficients, and normalized symmetric cumulants are approximately beam-energy independent, consistent with a significant role from initial-state effects. These measurements could provide unique supplemental constraints to (i) distinguish between different initial-state models and (ii) delineate the temperature (T) and baryon chemical potential (ОјB) dependence of the specific shear viscosity О·s(T,ОјB).