Abstract
We report the results of the femtoscopic analysis of pairs of identical pions measured in -Pb collisions at TeV. Femtoscopic radii are determined as a function of event multiplicity and pair momentum in three spatial dimensions. As in the collision system, the analysis is complicated by the presence of sizable background correlation structures in addition to the femtoscopic signal. The radii increase with event multiplicity and decrease with pair transverse momentum. When taken at comparable multiplicity, the radii measured in -Pb collisions, at high multiplicity and low pair transverse momentum, are 10%–20% higher than those observed in collisions but below those observed in collisions. The results are compared to hydrodynamic predictions at large event multiplicity as well as discussed in the context of calculations based on gluon saturation.
2 More- Received 3 February 2015
DOI:https://doi.org/10.1103/PhysRevC.91.034906
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©2015 CERN, for the ALICE Collaboration