Centrality dependence of pion freeze-out radii in Pb-Pb collisions at root s(NN)=2.76 TeV

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Adam , J , Brucken , E J , Chang , B , Hilden , T E , Kim , D J , Kral , J , Mieskolainen , M M , Orava , R , Rak , J , Räsänen , S S , Snellman , T W , Trzaska , W H & The ALICE Collaboration 2016 , ' Centrality dependence of pion freeze-out radii in Pb-Pb collisions at root s(NN)=2.76 TeV ' , Physical Review C , vol. 93 , no. 2 , 024905 . https://doi.org/10.1103/PhysRevC.93.024905

Title: Centrality dependence of pion freeze-out radii in Pb-Pb collisions at root s(NN)=2.76 TeV
Author: Adam, J.; Brucken, E. J.; Chang, B.; Hilden, T. E.; Kim, D. J.; Kral, J.; Mieskolainen, M. M.; Orava, R.; Rak, J.; Räsänen, S. S.; Snellman, T. W.; Trzaska, W. H.; The ALICE collaboration
Contributor organization: Helsinki Institute of Physics
Date: 2016-02-04
Language: eng
Number of pages: 18
Belongs to series: Physical Review C
ISSN: 2469-9985
DOI: https://doi.org/10.1103/PhysRevC.93.024905
URI: http://hdl.handle.net/10138/160885
Abstract: We report on the measurement of freeze-out radii for pairs of identical-charge pions measured in Pb-Pb collisions at root s(NN) = 2.76 TeV as a function of collision centrality and the average transverse momentum of the pair k(T). Three-dimensional sizes of the system (femtoscopic radii), as well as direction-averaged one-dimensional radii are extracted. The radii decrease with k(T), 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 <dN(ch)/d eta >(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 root s(NN), a decrease in the ratio R-out/R-side 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.
Subject: BOSE-EINSTEIN CORRELATIONS
HEAVY-ION COLLISIONS
QUARK-GLUON PLASMA
TRANSVERSE-MOMENTUM
COULOMB CORRECTIONS
INTERFEROMETRY
FEMTOSCOPY
COLLABORATION
PERSPECTIVE
HADRON
114 Physical sciences
Peer reviewed: Yes
Rights: cc_by
Usage restriction: openAccess
Self-archived version: publishedVersion


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