Measurement of longitudinal flow decorrelations in Pb plus Pb collisions at root s(NN)=2.76 and 5.02 TeV with the ATLAS detector
2018
Abstract
Measurements of longitudinal flow correlations are presented for charged particles in the pseudorapidity range |η| < 2.4 using 7 μb^-1 and 470 μb^-1 of Pb+Pb collisionsat SQUARE ROOT sNN = 2.76 and 5.02 TeV, respectively, recorded by the ATLAS detector at the LHC. It is found that the correlation between the harmonic flow coefficients vn measured in two separated η intervals does not factorise into the product of single-particle coefficients, and this breaking of factorisation, or flow decorrelation, increases linearly with the η separation between the intervals.