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 TeV. The source radius is studied with low relative momentum p–p, , p–Λ , and pairs as a function of the pair transverse mass 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, Λ s, and antiΛ s originate from the same source. Within the measured range (1.1–2.2) GeVthe 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.
Search for a common baryon source in high-multiplicity pp collisions at the LHC
Bonomi, G.;Pagano, D.;Zurlo, N.
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 TeV. The source radius is studied with low relative momentum p–p, , p–Λ , and pairs as a function of the pair transverse mass 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, Λ s, and antiΛ s originate from the same source. Within the measured range (1.1–2.2) GeVthe 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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.