Measurement of strange baryon-antibaryon interactions with femtoscopic correlations

Abstract

Two-particle correlation functions were measured for $\mathrm{p}\overline{\mathrm{p}}$, $\mathrm{p}\overline{\mathrm{\Lambda }}$, $\overline{\mathrm{p}}\mathrm{\Lambda }$, and $\Lambda \overline{\Lambda }$ pairs in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=2.76$ TeV and $\sqrt{s_{\mathrm{NN}}}=5.02$ 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 $\mathrm{p}\overline{\mathrm{\Lambda }}$ and $\overline{\mathrm{p}}\mathrm{\Lambda }$ pairs and, for the first time, for $\Lambda \overline{\Lambda }$ 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 $k^{\ast }$. 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.

arXiv comment25 pages, 4 captioned figures, 3 tables, authors from page 20, published version, figures at http://alice-publications.web.cern.ch/node/5185

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