One-dimensional pion, kaon, and proton femtoscopy in Pb–Pb collisions at √sNN = 2.76 TeV

Adam, J. and Adamová, D. and Aggarwal, M. M. and Aglieri, Rinella G. and Agnello M, 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) One-dimensional pion, kaon, and proton femtoscopy in Pb–Pb collisions at √sNN = 2.76 TeV. PHYSICAL REVIEW C, 92 (5). ISSN 2469-9985

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Abstract

The size of the particle emission region in high-energy collisions can be deduced using the femto- scopic correlations of particle pairs at low relative momentum. Such correlations arise due to quan- tum statistics and Coulomb and strong final state interactions. In this paper, results are presented from femtoscopic analyses of π± π±, K±K±, K0 SK0 S, pp, and pp correlations from Pb-Pb collisions at √sNN = 2.76 TeV by the ALICE experiment at the LHC. One-dimensional radii of the system are extracted from correlation functions in terms of the invariant momentum difference of the pair. The comparison of the measured radii with the predictions from a hydrokinetic model is discussed. The pion and kaon source radii display a monotonic decrease with increasing average pair transverse mass mT which is consistent with hydrodynamic model predictions for central collisions. The kaon and proton source sizes can be reasonably described by approximate mT-scaling.

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