Non-Gaussian elliptic-flow fluctuations in PbPb collisions at root S-NN=5.02 TeV


Sirunyan A. M., Tumasyan A., Adam W., Ambrogi F., Asilar E., Bergauer T., ...Daha Fazla

PHYSICS LETTERS B, cilt.789, ss.643-665, 2019 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 789
  • Basım Tarihi: 2019
  • Doi Numarası: 10.1016/j.physletb.2018.11.063
  • Dergi Adı: PHYSICS LETTERS B
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.643-665
  • Anahtar Kelimeler: Event-by-event elliptic flow, Non-Gaussian flow fluctuations, Unfolding, QUARK-GLUON PLASMA, PARTICLE-PRODUCTION, NUCLEAR COLLISIONS, PERSPECTIVE, ANISOTROPY, VISCOSITY
  • Orta Doğu Teknik Üniversitesi Adresli: Evet

Özet

Event-by-event fluctuations in the elliptic-flow coefficient v(2) are studied in PbPb collisions at root S-NN = 5.02 TeV using the CMS detector at the CERN LHC. Elliptic-flow probability distributions p(v(2)) for charged particles with transverse momentum 0.3 < p(T) < 3.0 GeV/c and pseudorapidity vertical bar eta vertical bar < 1.0 are determined for different collision centrality classes. The moments of the p(v(2)) distributions are used to calculate the v(2) coefficients based on cumulant orders 2, 4, 6, and 8. A rank ordering of the higher-order cumulant results and nonzero standardized skewness values obtained for the p(v(2)) distributions indicate non-Gaussian initial-state fluctuations. Bessel-Gaussian and elliptic power fits to the flow distributions are studied to characterize the initial-state spatial anisotropy. (C) 2018 The Author(s). Published by Elsevier B.V.