Measurement of azimuthal anisotropy of muons from charm and bottom hadrons in pp collisions at \sqrts=13 TeV with the ATLAS detector

Franconi, Laura; Haug, Sigve; Weber, Michele; Anders, John Kenneth; Fehr, Armin; Beck, Hans Peter; Ereditato, Antonio; Miucci, Antonio; Merlassino, Claudia; Weston, Thomas Daniel (2020). Measurement of azimuthal anisotropy of muons from charm and bottom hadrons in pp collisions at \sqrts=13 TeV with the ATLAS detector. Physical review letters, 124(8) American Physical Society 10.1103/PhysRevLett.124.082301

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he elliptic flow of muons from the decay of charm and bottom hadrons is measured in pp collisions at √s=13  TeV using a data sample with an integrated luminosity of 150  pb−1 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 4–7 GeV and pseudorapidity range |η|<2.4. A significant nonzero elliptic anisotropy coefficient v2 is observed for muons from charm decays, while the v2 value for muons from bottom decays is consistent with zero within uncertainties.

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