Azimuthally Differential Pion Femtoscopy in Pb-Pb Collisions at root s(NN)=2.76 TeV

Show simple item record Adamova, D. Brucken, E. J. Chang, B. Kim, D. J. Litichevskyi, V. Mieskolainen, M. M. Orava, R. Rak, J. Räsänen, S. S. Snellman, T. W. Trzaska, W. H. Viinikainen, J. The ALICE collaboration 2017-08-11T09:30:01Z 2017-08-11T09:30:01Z 2017-06-02
dc.identifier.citation Adamova , D , Brucken , E J , Chang , B , Kim , D J , Litichevskyi , V , Mieskolainen , M M , Orava , R , Rak , J , Räsänen , S S , Snellman , T W , Trzaska , W H , Viinikainen , J & The ALICE Collaboration 2017 , ' Azimuthally Differential Pion Femtoscopy in Pb-Pb Collisions at root s(NN)=2.76 TeV ' , Physical Review Letters , vol. 118 , no. 22 , 222301 .
dc.identifier.other PURE: 88122672
dc.identifier.other PURE UUID: d1cc5a23-654f-456d-86fb-c1911fd74867
dc.identifier.other WOS: 000402681500003
dc.identifier.other Scopus: 85020383731
dc.identifier.other ORCID: /0000-0003-2530-4265/work/41154251
dc.identifier.other ORCID: /0000-0001-8893-7401/work/48397233
dc.identifier.other ORCID: /0000-0002-2574-241X/work/40903895
dc.description.abstract We present the first azimuthally differential measurements of the pion source size relative to the second harmonic event plane in Pb-Pb collisions at a center-of-mass energy per nucleon-nucleon pair of root(NN)-N-s = 2.76 TeV. The measurements have been performed in the centrality range 0%-50% and for pion pair transverse momenta 0.2 <k(T) <0.7 GeV/c. We find that the R-side and R-out radii, which characterize the pion source size in the directions perpendicular and parallel to the pion transverse momentum, oscillate out of phase, similar to what was observed at the Relativistic Heavy Ion Collider. The final-state source eccentricity, estimated via R-side oscillations, is found to be significantly smaller than the initial-state source eccentricity, but remains positive-indicating that even after a stronger expansion in the in-plane direction, the pion source at the freeze-out is still elongated in the out-of-plane direction. The 3 + 1D hydrodynamic calculations are in qualitative agreement with observed centrality and transverse momentum R-side oscillations, but systematically underestimate the oscillation magnitude. en
dc.format.extent 12
dc.language.iso eng
dc.relation.ispartof Physical Review Letters
dc.rights cc_by
dc.rights.uri info:eu-repo/semantics/openAccess
dc.subject 114 Physical sciences
dc.title Azimuthally Differential Pion Femtoscopy in Pb-Pb Collisions at root s(NN)=2.76 TeV en
dc.type Article
dc.contributor.organization Helsinki Institute of Physics
dc.description.reviewstatus Peer reviewed
dc.relation.issn 0031-9007
dc.rights.accesslevel openAccess
dc.type.version publishedVersion

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