Azimuthal anisotropy of charged particles with transverse momentum up to 100GeV/c in PbPb collisions at root S-NN=5.02 TeV


Sirunyan A. M., Tumasyan A., Adam W., Asilar E., Bergauer T., Brandstetter J., ...Daha Fazla

PHYSICS LETTERS B, cilt.776, ss.195-216, 2018 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 776
  • Basım Tarihi: 2018
  • Doi Numarası: 10.1016/j.physletb.2017.11.041
  • Dergi Adı: PHYSICS LETTERS B
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.195-216
  • Anahtar Kelimeler: CMS, QGP, High-pT, Flow, Parton energy loss, Jet quenching, PLUS AU COLLISIONS, HIGH-P(T) HADRON SUPPRESSION, QUARK-GLUON PLASMA, AU+AU COLLISIONS, ROOT-S(NN)=130 GEV, ELLIPTIC FLOW, DEPENDENCE, DISTRIBUTIONS, PERSPECTIVE, SPECTRA
  • İstanbul Üniversitesi Adresli: Evet

Özet

The Fourier coefficients v(2) and v(3) characterizing the anisotropy of the azimuthal distribution of charged particles produced in PbPb collisions at root S-NN = 5.02 TeV are measured with data collected by the CMS experiment. The measurements cover a broad transverse momentum range, 1 < p(T) < 100 GeV/c. The analysis focuses on the p(T) > 10 GeV/c range, where anisotropic azimuthal distributions should reflect the path-length dependence of parton energy loss in the created medium. Results are presented in several bins of PbPb collision centrality, spanning the 60% most central events. The v(2) coefficient is measured with the scalar product and the multiparticle cumulant methods, which have different sensitivities to initial-state fluctuations. The values from both methods remain positive up to p(T) similar to 60-80 GeV/c, in all examined centrality classes. The v(3) coefficient, only measured with the scalar product method, tends to zero for p(T) greater than or similar to 20 GeV/c. Comparisons between theoretical calculations and data provide new constraints on the path-length dependence of parton energy loss in heavy ion collisions and highlight the importance of the initial-state fluctuations. (C) 2017 The Author. Published by Elsevier B.V.