Azimuthally differential pion femtoscopy in pb-Pb collisions at √sNN=2.76 TeV
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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| Hauptverfasser: | , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
2 June 2017
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| In: |
Physical review letters
Year: 2017, Jahrgang: 118, Heft: 22 |
| ISSN: | 1079-7114 |
| DOI: | 10.1103/PhysRevLett.118.222301 |
| Online-Zugang: | 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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| Verfasserangaben: | D. Adamová et al.* (ALICE Collaboration) |
MARC
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| 245 | 1 | 0 | |a Azimuthally differential pion femtoscopy in pb-Pb collisions at √sNN=2.76 TeV |c D. Adamová et al.* (ALICE Collaboration) |
| 246 | 3 | 0 | |a sqrt(s_NN) |
| 246 | 3 | 3 | |a Azimuthally differential pion femtoscopy in pb-Pb collisions at square root s NN = 2.76 TeV |
| 264 | 1 | |c 2 June 2017 | |
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| 500 | |a 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] | ||
| 500 | |a Im Titel steht der Ausdruck "sNN" unter dem Wurzelsymbol, "NN" ist dabei tiefgestellt | ||
| 500 | |a Gesehen am 18.08.2020 | ||
| 520 | |a 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. | ||
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