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

ALICE Collaboration

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The size of the particle emission region in high-energy collisions can be deduced using the femtoscopic correlations of particle pairs at low relative momentum. Such correlations arise due to quantum statistics and Coulomb and strong final state interactions. In this paper, results are presented from femtoscopic analyses of π±π±, K±K±, KS0KS0, pp, and p̅p̅ 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.
Original languageEnglish
Article number54908
Number of pages15
JournalPhysical Review C
Issue number5
Publication statusPublished - 19 Nov 2015


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