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