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

Show full item record



Permalink

http://hdl.handle.net/10138/209965

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 . https://doi.org/10.1103/PhysRevLett.118.222301

Title: Azimuthally Differential Pion Femtoscopy in Pb-Pb Collisions at root s(NN)=2.76 TeV
Author: 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
Contributor: University of Helsinki, Helsinki Institute of Physics
University of Helsinki, University of Jyväskylä
University of Helsinki, University of Jyväskylä
University of Helsinki, Helsinki Institute of Physics
University of Helsinki, Helsinki Institute of Physics
University of Helsinki, Helsinki Institute of Physics
University of Helsinki, University of Jyväskylä
University of Helsinki, Helsinki Institute of Physics
University of Helsinki, University of Jyväskylä
University of Helsinki, University of Jyväskylä
University of Helsinki, University of Jyväskylä
Date: 2017-06-02
Number of pages: 12
Belongs to series: Physical Review Letters
ISSN: 0031-9007
URI: http://hdl.handle.net/10138/209965
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.
Subject: HEAVY-ION COLLISIONS
ANISOTROPIC TRANSVERSE FLOW
MULTIPLE PRODUCTION
INTERFEROMETRY
114 Physical sciences
Rights:


Files in this item

Total number of downloads: Loading...

Files Size Format View
PhysRevLett.118.222301.pdf 543.4Kb PDF View/Open

This item appears in the following Collection(s)

Show full item record