Abstract
The elliptic flow of muons from the decay of charm and bottom hadrons is measured in πβ’π collisions at βπ =13ββTeV using a data sample with an integrated luminosity of 150ββpbβ1 recorded by the ATLAS detector at the LHC. The muons from heavy-flavor decay are separated from light-hadron decay muons using momentum imbalance between the tracking and muon spectrometers. The heavy-flavor decay muons are further separated into those from charm decay and those from bottom decay using the distance-of-closest-approach to the collision vertex. The measurement is performed for muons in the transverse momentum range 4β7 GeV and pseudorapidity range |π| <2.4. A significant nonzero elliptic anisotropy coefficient π£2 is observed for muons from charm decays, while the π£2 value for muons from bottom decays is consistent with zero within uncertainties.