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

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 s = 13 TeV. The source radius is studied with low relative momentum p–p, p ‾ – p ‾ , p–Λ , and p ‾ – Λ ‾ 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, Λ s, and Λ ‾ s originate from the same source. Within the measured m T range (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.

• Publication year

  2020

• Venue

  Physics Letters B

• Publication date

  2020-12-01

• Fields of study

  Physics

• Identifiers
  DOI 10.1016/J.PHYSLETB.2020.135849
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar

• No claims are published for this paper.

• No concepts are published for this paper.

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