TY - GEN
T1 - Transverse momentum fluctuation in ultra-central Pb+Pb collision at the LHC
AU - Samanta, Rupam
AU - Bhatta, Somadutta
AU - Jia, Jiangyong
AU - Luzum, Matthew
AU - Ollitrault, Jean Yves
N1 - Publisher Copyright: © The Authors, published by EDP Sciences.
PY - 2024/6/26
Y1 - 2024/6/26
N2 - The ATLAS collaboration has recently observed that the variance of the transverse momentum per particle ([pt]), when measured as a function of the collision multiplicity (Nch) in Pb+Pb collisions, decreases by a factor 2 for the largest values of Nch, corresponding to ultra-central collisions. We show that this phenomenon is naturally explained by invoking impact parameter (b) fluctuations, which contribute to the variance, and gradually disappear in ultra-central collisions. It implies that Nch and [pt] are strongly correlated at fixed b, which is explained by the local thermalization of the QGP medium.
AB - The ATLAS collaboration has recently observed that the variance of the transverse momentum per particle ([pt]), when measured as a function of the collision multiplicity (Nch) in Pb+Pb collisions, decreases by a factor 2 for the largest values of Nch, corresponding to ultra-central collisions. We show that this phenomenon is naturally explained by invoking impact parameter (b) fluctuations, which contribute to the variance, and gradually disappear in ultra-central collisions. It implies that Nch and [pt] are strongly correlated at fixed b, which is explained by the local thermalization of the QGP medium.
UR - https://www.scopus.com/pages/publications/85211893089
U2 - 10.1051/epjconf/202429605006
DO - 10.1051/epjconf/202429605006
M3 - Conference contribution
T3 - EPJ Web of Conferences
BT - 30th International Conference on Ultra-Relativistic Nucleus-Nucleus Collisions, Quark Matter 2023
A2 - Bellwied, Rene
A2 - Geurts, Frank
A2 - Rapp, Ralf
A2 - Ratti, Claudia
A2 - Timmins, Anthony
A2 - Vitev, Ivan
PB - EDP Sciences
T2 - 30th International Conference on Ultra-Relativistic Nucleus-Nucleus Collisions, Quark Matter 2023
Y2 - 3 September 2023 through 9 September 2023
ER -