Measurement of strange baryon–antibaryon interactions with femtoscopic correlations

ALICE Collaboration

Research output

Abstract

Two-particle correlation functions were measured for pp‾, pΛ‾, p‾Λ, and ΛΛ‾ pairs in Pb–Pb collisions at sNN=2.76 TeV and sNN=5.02 TeV recorded by the ALICE detector. From a simultaneous fit to all obtained correlation functions, real and imaginary components of the scattering lengths, as well as the effective ranges, were extracted for combined pΛ‾ and p‾Λ pairs and, for the first time, for ΛΛ‾ pairs. Effective averaged scattering parameters for heavier baryon–antibaryon pairs, not measured directly, are also provided. The results reveal similarly strong interaction between measured baryon–antibaryon pairs, suggesting that they all annihilate in the same manner at the same pair relative momentum k. Moreover, the reported significant non-zero imaginary part and negative real part of the scattering length provide motivation for future baryon–antibaryon bound state searches.

Original languageEnglish
Article number135223
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume802
DOIs
Publication statusPublished - 10 Mar 2020

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Scopus subject areas

  • Nuclear and High Energy Physics

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