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Probing initial-state fluctuations with p(T)-dependent event-plane angle in pPb and PbPb collisions
dc.creator | Devetak, Damir | |
dc.creator | CMS Collaboration | |
dc.date.accessioned | 2018-03-01T15:48:52Z | |
dc.date.available | 2018-03-01T15:48:52Z | |
dc.date.issued | 2014 | |
dc.identifier.issn | 0375-9474 | |
dc.identifier.issn | 1873-1554 | |
dc.identifier.uri | https://vinar.vin.bg.ac.rs/handle/123456789/347 | |
dc.description.abstract | The technique of two-particle correlations has been widely used in studying flow via azimuthal anisotropy in relativistic heavy-ion collisions. A key assumption imposed in this approach is the factorization of Fourier coefficients extracted from two-particle correlations into a product of single-particle anisotropies of trigger and associated particles. It was recently predicted by hydrodynamics that due to initial-state participant fluctuations, a transverse momentum (p(T)) dependence of the event-plane angle would be induced, leading to a breakdown of factorization, even if hydrodynamic flow is the only source of correlations. We present a systematic examination of the factorization assumption in pPb and PbPb collisions at a nucleon nucleon center-of-mass energy of 5.02 TeV and 2.76 TeV, respectively, with the CMS experiment. Significant breakdown of factorization (up to 20%) is observed in a large sample of ultra-central (0-0.2%) triggered PbPb events, where initial-state fluctuations play a dominant role. Comparison of data and viscous hydrodynamic predictions, as a function of p(T) and centrality, allows new constraints on the modeling of initial condition and shear viscosity to entropy density (eta/s) ratio of the medium created in heavy-ion collisions. Furthermore, the measurement is also extended to high-multiplicity pPb collisions. As the initial-state geometry of a pPb collision is expected to be entirely a consequence of fluctuations, quantitative studies of factorization breakdown will help to investigate the nature of the observed long-range correlations in pPb collisions, particularly in the context of hydrodynamic models. (C) 2014 CERN. Published by Elsevier B.V. All rights reserved. | en |
dc.rights | restrictedAccess | en |
dc.source | Nuclear Physics A | en |
dc.subject | Dihadron correlations | en |
dc.subject | Factorization | en |
dc.subject | Initial state fluctuations | en |
dc.title | Probing initial-state fluctuations with p(T)-dependent event-plane angle in pPb and PbPb collisions | en |
dc.type | article | en |
dcterms.abstract | Деветак Дамир; ЦМС Цоллаборатион; | |
dc.citation.volume | 931 | |
dc.citation.spage | 954 | |
dc.citation.epage | 958 | |
dc.identifier.wos | 000347598500152 | |
dc.identifier.doi | 10.1016/j.nuclphysa.2014.10.017 | |
dc.citation.rank | M22 | |
dc.type.version | publishedVersion | |
dc.identifier.scopus | 2-s2.0-84922343189 |
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