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Centrality dependence of pion freeze-out radii in Pb-Pb collisions at √sNN=2.76 TeV

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We report on the measurement of freeze-out radii for pairs of identical-charge pions measured in Pb-Pb collisions at √sNN=2.76 TeV as a function of collision centrality and the average transverse momentum of the pair kT. Three-dimensional sizes of the system (femtoscopic radii), as well as direction...

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Main Authors: Adam, Jaroslav (Author) , Angelov, Venelin (Author) , Bock, Friederike (Author) , Busch, Oliver (Author) , Deisting, Alexander (Author) , Fleck, Martin (Author) , Glässel, Peter (Author) , Karayan, Lilit (Author) , Knichel, Michael Linus (Author) , Leardini, Lucia (Author) , Mercado Pérez, Jorge (Author) , Oeschler, Helmut (Author) , Oyama, Ken (Author) , Pachmayer, Yvonne C. (Author) , Reidt, Felix (Author) , Reygers, Klaus (Author) , Schicker, Rainer (Author) , Stachel, Johanna (Author) , Stiller, Johannes Hendrik (Author) , Völkl, Martin (Author) , Wang, Yifei (Author) , Wilkinson, Jeremy (Author) , Windelband, Bernd (Author) , Winn, Michael (Author) , Zimmermann, Alice (Author)
Corporate Author: ALICE (Author)
Format: Article (Journal)
Language:English
Published: 4 February 2016
In: Physical review
Year: 2016, Volume: 93, Issue: 2
ISSN:2469-9993
DOI:10.1103/PhysRevC.93.024905
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1103/PhysRevC.93.024905
Verlag, lizenzpflichtig, Volltext: https://link.aps.org/doi/10.1103/PhysRevC.93.024905
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Author Notes:J. Adam et al.* (ALICE Collaboration)
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Summary:We report on the measurement of freeze-out radii for pairs of identical-charge pions measured in Pb-Pb collisions at √sNN=2.76 TeV as a function of collision centrality and the average transverse momentum of the pair kT. Three-dimensional sizes of the system (femtoscopic radii), as well as direction-averaged one-dimensional radii are extracted. The radii decrease with kT, following a power-law behavior. This is qualitatively consistent with expectations from a collectively expanding system, produced in hydrodynamic calculations. The radii also scale linearly with ⟨dNch/dη⟩1/3. This behavior is compared to world data on femtoscopic radii in heavy-ion collisions. While the dependence is qualitatively similar to results at smaller √sNN, a decrease in the ratio Rout/Rside is seen, which is in qualitative agreement with a specific prediction from hydrodynamic models: a change from inside-out to outside-in freeze-out configuration. The results provide further evidence for the production of a collective, strongly coupled system in heavy-ion collisions at the CERN Large Hadron Collider.
Item Description:Im Titel stehen der Ausdruck "sNN" unter dem Wurzelsymbol
ALICE collaboration: J. Adam, V. Anguelov, F. Bock, O. Busch, A. Deisting, M.G. Fleck, P. Glässel, L. Karayan, M.L. Knichel, L. Leardini, J. Mercado Pérez, H. Oeschler, K. Oyama, Y. Pachmayer, F. Reidt, K. Reygers, R. Schicker, J. Stachel, J.H. Stiller, M.A. Völkl, Y. Wang, J. Wilkinson, B. Windelband, M. Winn, A. Zimmermann [und 964 weitere]
Gesehen am 28.07.2020
Physical Description:Online Resource
ISSN:2469-9993
DOI:10.1103/PhysRevC.93.024905

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