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

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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=2.76 TeV. The measurements have been performed in the centrality range 0%-50% and for pion pa...

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Main Authors: Adamová, Dagmar (Author) , Angelov, Venelin (Author) , Arslandok, Mesut (Author) , Busch, Oliver (Author) , Danisch, Meike (Author) , Deisting, Alexander (Author) , Glässel, Peter (Author) , Klewin, Sebastian (Author) , Knichel, Michael Linus (Author) , Leardini, Lucia (Author) , Mercado Pérez, Jorge (Author) , Oeschler, Helmut (Author) , Ohlson, Alice (Author) , Oyama, Ken (Author) , Pachmayer, Yvonne C. (Author) , Reidt, Felix (Author) , Reygers, Klaus (Author) , Schicker, Rainer (Author) , Schmidt, Marten Ole (Author) , Stachel, Johanna (Author) , Stiller, Johannes Hendrik (Author) , Völkl, Martin (Author) , Weiser, Dennis (Author) , Wilkinson, Jeremy (Author) , Windelband, Bernd (Author) , Zimmermann, Alice (Author)
Corporate Author: ALICE (Author)
Format: Article (Journal)
Language:English
Published: 2 June 2017
In: Physical review letters
Year: 2017, Volume: 118, Issue: 22
ISSN:1079-7114
DOI:10.1103/PhysRevLett.118.222301
Online Access:Verlag, Volltext: http://dx.doi.org/10.1103/PhysRevLett.118.222301
Verlag, Volltext: https://link.aps.org/doi/10.1103/PhysRevLett.118.222301
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Author Notes:D. Adamová et al.* (ALICE Collaboration)
Description
Summary: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=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+1D hydrodynamic calculations are in qualitative agreement with observed centrality and transverse momentum Rside oscillations, but systematically underestimate the oscillation magnitude.
Item Description:D. Adamova, V. Anguelov, M. Arslandok, O. Busch, A. Deisting, P. Glässel, S. Klewin, L. Leardini, J. Mercado Pérez, A. Ohlson, Y. Pachmayer, K. Reygers, R. Schicker, M.O. Schmidt, J. Stachel, D.F. Weiser, B. Windelband [und weitere]
Im Titel steht der Ausdruck "sNN" unter dem Wurzelsymbol, "NN" ist dabei tiefgestellt
Gesehen am 18.08.2020
Physical Description:Online Resource
ISSN:1079-7114
DOI:10.1103/PhysRevLett.118.222301

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