TY - JOUR
T1 - Fluctuations of anisotropic flow in Pb+Pb collisions at √(sNN) = 5.02 TeV with the ATLAS detector
AU - Clark, Philip James
AU - Farrington, Sinead
AU - Faucci Giannelli, Michele
AU - Gao, Yanyan
AU - Hasib, Ahmed
AU - Leonidopoulos, Christos
AU - Martin, Victoria Jane
AU - Mijovic, Liza
AU - Wynne, Benjamin
AU - Collaboration, Atlas
PY - 2020/1/9
Y1 - 2020/1/9
N2 - Multi-particle azimuthal cumulants are measured as a function of centrality and transverse momentum using 470 μb$^{−1}$ of Pb+Pb collisions at $ \sqrt{s_{\mathrm{NN}}} $ = 5.02 TeV with the ATLAS detector at the LHC. These cumulants provide information on the event-by-event fluctuations of harmonic flow coefficients v$_{n}$ and correlated fluctuations between two harmonics v$_{n}$ and v$_{m}$. For the first time, a non-zero four-particle cumulant is observed for dipolar flow, v$_{1}$. The four-particle cumulants for elliptic flow, v$_{2}$, and triangular flow, v$_{3}$, exhibit a strong centrality dependence and change sign in ultra-central collisions. This sign change is consistent with significant non-Gaussian fluctuations in v$_{2}$ and v$_{3}$. The four-particle cumulant for quadrangular flow, v$_{4}$, is found to change sign in mid-central collisions. Correlations between two harmonics are studied with three- and four-particle mixed-harmonic cumulants, which indicate an anti-correlation between v2 and v3, and a positive correlation between v$_{2}$ and v$_{4}$. These correlations decrease in strength towards central collisions and either approach zero or change sign in ultra-central collisions. To investigate the possible flow fluctuations arising from intrinsic centrality or volume fluctuations, the results are compared between two different event classes used for centrality definitions. In peripheral and mid-central collisions where the cumulant signals are large, only small differences are observed. In ultra-central collisions, the differences are much larger and transverse momentum dependent. These results provide new information to disentangle flow fluctuations from the initial and final states, as well as new insights on the influence of centrality fluctuations.[graphic not available: see fulltext]
AB - Multi-particle azimuthal cumulants are measured as a function of centrality and transverse momentum using 470 μb$^{−1}$ of Pb+Pb collisions at $ \sqrt{s_{\mathrm{NN}}} $ = 5.02 TeV with the ATLAS detector at the LHC. These cumulants provide information on the event-by-event fluctuations of harmonic flow coefficients v$_{n}$ and correlated fluctuations between two harmonics v$_{n}$ and v$_{m}$. For the first time, a non-zero four-particle cumulant is observed for dipolar flow, v$_{1}$. The four-particle cumulants for elliptic flow, v$_{2}$, and triangular flow, v$_{3}$, exhibit a strong centrality dependence and change sign in ultra-central collisions. This sign change is consistent with significant non-Gaussian fluctuations in v$_{2}$ and v$_{3}$. The four-particle cumulant for quadrangular flow, v$_{4}$, is found to change sign in mid-central collisions. Correlations between two harmonics are studied with three- and four-particle mixed-harmonic cumulants, which indicate an anti-correlation between v2 and v3, and a positive correlation between v$_{2}$ and v$_{4}$. These correlations decrease in strength towards central collisions and either approach zero or change sign in ultra-central collisions. To investigate the possible flow fluctuations arising from intrinsic centrality or volume fluctuations, the results are compared between two different event classes used for centrality definitions. In peripheral and mid-central collisions where the cumulant signals are large, only small differences are observed. In ultra-central collisions, the differences are much larger and transverse momentum dependent. These results provide new information to disentangle flow fluctuations from the initial and final states, as well as new insights on the influence of centrality fluctuations.[graphic not available: see fulltext]
U2 - 10.1007/JHEP01(2020)051
DO - 10.1007/JHEP01(2020)051
M3 - Article
SN - 1029-8479
VL - 2020
JO - Journal of High Energy Physics
JF - Journal of High Energy Physics
M1 - 51
ER -