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Azimuthally differential pion femtoscopy in Pb-Pb collisions at √sNN = 2.76 TeV

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Azimuthally differential pion femtoscopy in Pb-Pb collisions at √sNN = 2.76 TeV

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Título Azimuthally differential pion femtoscopy in Pb-Pb collisions at √sNN = 2.76 TeV
Autor Adamova, Dagmar
Gay Ducati, Maria Beatriz
Pereira, Luis Gustavo
Pezzi, Rafael Peretti
ALICE Collaboration
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 sNN p ¼ 2.76 TeV. The measurements have been performed in the centrality range 0%–50% and for pion pair transverse momenta 0.2 < kT < 0.7 GeV=c. We find that the Rside and Rout 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 Rside 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 þ 1D hydrodynamic calculations are in qualitative agreement with observed centrality and transverse momentum Rside oscillations, but systematically underestimate the oscillation magnitude.
Contido em Physical review letters. Melville. Vol. 118, no. 22 (June 2017), 222301, 12 p.
Assunto Aceleradores de partículas
Colisao de ions pesados
Origem Estrangeiro
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/165593
Arquivos Descrição Formato
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