Two-pion femtoscopy in p–Pb collisions at √sNN = 5.02 TeV

Adam, J. and Adamova, D. and Aggarwal, M. M. and Rinella, G. A. and Agnello, M. and Barnaföldi, Gergely Gábor and Bencédi, Gyula and Berényi, Dániel and Boldizsár, László and Dénes, Ervin and Hamar, Gergő and Kiss, Gábor and Varga-Kőfaragó, Mónika and Lévai, Péter and Oláh, László and Pochybova, Sona (2015) Two-pion femtoscopy in p–Pb collisions at √sNN = 5.02 TeV. PHYSICAL REVIEW C, 91 (3). ISSN 2469-9985

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Abstract

We report the results of the femtoscopic analysis of pairs of identical pions measured in p–Pb col- lisions at √sNN = 5.02 TeV. Femtoscopic radii are determined as a function of event multiplicity and pair momentum in three spatial dimensions. As in the pp collision system, the analysis is com- plicated 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 p–Pb collisions, at high multiplicity and low pair transverse momentum, are 10–20% higher than those observed in pp collisions but below those observed in A–A 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.

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