Measurement of Azimuthal Anisotropy of Muons from Charm and Bottom Hadrons in pp Collisions at s =13 TeV with the ATLAS Detector

ATLAS Collaboration, G Aad, Torsten Åkesson, Simona Bocchetta, Lene Bryngemark, Eric Edward Corrigan, Caterina Doglioni, Kristian Gregersen, Eva Brottmann Hansen, Vincent Hedberg, Göran Jarlskog, Charles Kalderon, Edgar Kellermann, Balazs Konya, Else Lytken, Katja Mankinen, Caterina Marcon, Ulf Mjörnmark, Geoffrey André Adrien Mullier, Ruth PöttgenTrine Poulsen, Eleni Skorda, Oxana Smirnova, L. Zwalinski

Research output: Contribution to journalArticlepeer-review


The 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.
Original languageEnglish
Article number082301
JournalPhysical Review Letters
Issue number8
Publication statusPublished - 2020 Feb 26

Subject classification (UKÄ)

  • Subatomic Physics

Free keywords

  • Anisotropy
  • Decay (organic)
  • Germanium compounds
  • Hadrons
  • Tellurium compounds
  • Anisotropy coefficients
  • ATLAS detectors
  • Azimuthal anisotropy
  • Elliptic flows
  • Integrated luminosity
  • Muon spectrometer
  • Pseudorapidities
  • Transverse momenta
  • Charged particles


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