CERN Accelerating science

Article
Report number arXiv:1507.06842 ; CERN-PH-EP-2015-140 ; CERN-PH-EP-2015-140
Title Centrality dependence of pion freeze-out radii in Pb-Pb collisions at sNN=2.76 TeV
Author(s) ALICE Collaboration  Zeige alle 989 Autoren
Publication 2016-02-04
Imprint 24 Jul 2015
Number of pages 18
Note 28 pages, 9 captioned figures, 1 table, authors from page 23, published version, figures at http://aliceinfo.cern.ch/ArtSubmission/node/1816
In: Phys. Rev. C 93 (2016) 024905
DOI 10.1103/PhysRevC.93.024905
Subject category Nuclear Physics - Experiment
Accelerator/Facility, Experiment CERN LHC ; ALICE
Abstract 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/dη1/3. This behaviour 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 Rout/Rside ratio is seen, which is in qualitative agreement with specific predictions from hydrodynamic models. The results provide further evidence for the production of a collective, strongly coupled system in heavy-ion collisions at the LHC.
Copyright/License preprint: © 2015-2025 CERN (License: CC-BY-4.0)
publication: © 2016-2025 The Author(s) (License: CC-BY-3.0)



Corresponding record in: Inspire
Email contact: cloizides@lbl.gov


 Datensatz erzeugt am 2015-07-27, letzte Änderung am 2025-01-14


APS Open Access article:
Volltext herunterladenPDF
Volltext:
Volltext herunterladenPDF
Externer link:
Volltext herunterladenPreprint
  • Send to ScienceWise.info