We report on the measurement of the size of the particle-emitting source from two-baryon correlations with ALICE in high-multiplicity pp collisions at root s= 13TeV. The source radius is studied with low relative momentum p-p, (p) over bar-(p) over bar, p-Lambda, and p-(Lambda) over bar pairs as a function of the pair transverse mass m(T) considering for the first time in a quantitative way the effect of strong resonance decays. After correcting for this effect, the radii extracted for pairs of different particle species agree. This indicates that protons, antiprotons, (Lambda) over bars, and (Lambda) over bars originate from the same source. Within the measured mTrange (1.1-2.2) GeV/c(2) the invariant radius of this common source varies between 1.3 and 0.85 fm. These results provide a precise reference for studies of the strong hadron-hadron interactions and for the investigation of collective properties in small colliding systems. (C) 2020 CERN for the benefit of the ALICE Collaboration. Published by Elsevier B.V.

Search for a common baryon source in high-multiplicity pp collisions at the LHC

D. Colella
Membro del Collaboration Group
;
D. Di Bari
Membro del Collaboration Group
;
M. Mazzilli;G. Volpe
Membro del Collaboration Group
;
2020-01-01

Abstract

We report on the measurement of the size of the particle-emitting source from two-baryon correlations with ALICE in high-multiplicity pp collisions at root s= 13TeV. The source radius is studied with low relative momentum p-p, (p) over bar-(p) over bar, p-Lambda, and p-(Lambda) over bar pairs as a function of the pair transverse mass m(T) considering for the first time in a quantitative way the effect of strong resonance decays. After correcting for this effect, the radii extracted for pairs of different particle species agree. This indicates that protons, antiprotons, (Lambda) over bars, and (Lambda) over bars originate from the same source. Within the measured mTrange (1.1-2.2) GeV/c(2) the invariant radius of this common source varies between 1.3 and 0.85 fm. These results provide a precise reference for studies of the strong hadron-hadron interactions and for the investigation of collective properties in small colliding systems. (C) 2020 CERN for the benefit of the ALICE Collaboration. Published by Elsevier B.V.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11586/431741
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