Centrality dependence of pion freeze-out radii in Pb-Pb collisions at √sNN = 2.76 TeV
ALICE Collaboration. (2016). Centrality dependence of pion freeze-out radii in Pb-Pb collisions at √sNN = 2.76 TeV. Physical Review C, 93(2), Article 024905. https://doi.org/10.1103/PhysRevC.93.024905
Published inPhysical Review C
©2016 CERN, for the ALICE Collaboration. Published by the American Physical Society under the terms of the Creative Commons Attribution 3.0 License.
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 onedimensional 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. ...
PublisherAmerican Physical Society
Publication in research information system
MetadataShow full item record
Except where otherwise noted, this item's license is described as ©2016 CERN, for the ALICE Collaboration. Published by the American Physical Society under the terms of the Creative Commons Attribution 3.0 License.
Showing items with similar title or keywords.
ALICE Collaboration (Springer, 2016)Measurements of charged jet production as a function of centrality are presented for p–Pb collisions recorded at √sNN = 5.02 TeV with the ALICE detector. Centrality classes are determined via the energy deposit in ...
ALICE Collaboration; Chang, BeomSu; Kim, Dong Jo; Kral, Jiri; Rak, Jan; Räsänen, Sami; Slupecki, Maciej; Snellman, Tomas; Trzaska, Wladyslaw; Vargyas, Márton; Viinikainen, Jussi (Springer Berlin Heidelberg, 2015)The nuclear modification factor, RAA, of the prompt charmed mesons D0 , D+ and D∗+, and their antiparticles, was measured with the ALICE detector in Pb-Pb collisions at a centre-of-mass energy √ sNN = 2.76 TeV in two ...
ALICE Collaboration; Chang, BeomSu; Kim, Dong Jo; Rak, Jan; Räsänen, Sami; Slupecki, Maciej; Snellman, Tomas; Trzaska, Wladyslaw; Vargyas, Márton; Viinikainen, Jussi (Springer Berlin Heidelberg, 2016)The inclusive production of the ψ(2S) charmonium state was studied as a function of centrality in p-Pb collisions at the nucleon-nucleon center of mass energy √ sNN = 5.02 TeV at the CERN LHC. The measurement was performed ...
ALICE Collaboration (Springer Berlin Heidelberg, 2015)We present a measurement of inclusive J/ψ production in p-Pb collisions at √ sNN = 5.02 TeV as a function of the centrality of the collision, as estimated from the energy deposited in the Zero Degree Calorimeters. The ...
Centrality and rapidity dependence of inclusive pion and prompt photon production in p+Pb collisions at the LHC with EPS09s nPDFs Helenius, Ilkka; Eskola, Kari; Paukkunen, Hannu (Institute of Physics Publishing Ltd., 2015)The centrality dependencies of the inclusive neutral pion and prompt photon nuclear modification factors for p+Pb collisions at the LHC are studied using a spatially dependent set of nuclear PDFs, EPS09s. The calculations ...