Centrality dependence of pion freeze-out radii in Pb-Pb collisions at sNN =2.76 TeV
(2016) In Physical Review C 93(2).- 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/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... (More)
- 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. © 2016 CERN. (Less)
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- author
- J., Adam ; Christiansen, P. LU ; Ljunggren, H. LU ; Oskarsson, A. LU ; Richert, T. LU ; Silvermyr, D. LU ; Søgaard, C. LU ; Stenlund, E. LU ; Vislavicius, V. LU and M., Zyzak
- author collaboration
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- 2016
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Physical Review C
- volume
- 93
- issue
- 2
- article number
- 024905
- publisher
- American Physical Society
- external identifiers
-
- scopus:84959387322
- ISSN
- 2469-9985
- DOI
- 10.1103/PhysRevC.93.024905
- language
- English
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- yes
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- a4cd240d-14c8-4178-8409-4be842133200
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- 2022-04-04 13:47:24
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- 2023-01-17 04:30:17
@article{a4cd240d-14c8-4178-8409-4be842133200, 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/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. © 2016 CERN.}}, author = {{J., Adam and Christiansen, P. and Ljunggren, H. and Oskarsson, A. and Richert, T. and Silvermyr, D. and Søgaard, C. and Stenlund, E. and Vislavicius, V. and M., Zyzak}}, issn = {{2469-9985}}, language = {{eng}}, number = {{2}}, publisher = {{American Physical Society}}, series = {{Physical Review C}}, title = {{Centrality dependence of pion freeze-out radii in Pb-Pb collisions at sNN =2.76 TeV}}, url = {{http://dx.doi.org/10.1103/PhysRevC.93.024905}}, doi = {{10.1103/PhysRevC.93.024905}}, volume = {{93}}, year = {{2016}}, }