Measurement of strange baryon–antibaryon interactions with femtoscopic correlations



Acharya, S, Adamová, D, Adhya, SP, Adler, A, Adolfsson, J, Aggarwal, MM, Aglieri Rinella, G, Agnello, M, Agrawal, N, Ahammed, Z
et al (show 1019 more authors) (2020) Measurement of strange baryon–antibaryon interactions with femtoscopic correlations. Physics Letters B, 802. p. 135223.

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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.

Item Type: Article
Uncontrolled Keywords: 5106 Nuclear and Plasma Physics, 5107 Particle and High Energy Physics, 51 Physical Sciences
Divisions: Faculty of Science and Engineering > School of Physical Sciences
Depositing User: Symplectic Admin
Date Deposited: 07 Sep 2021 13:53
Last Modified: 11 Jun 2024 01:23
DOI: 10.1016/j.physletb.2020.135223
Open Access URL: https://doi.org/10.1016/j.physletb.2020.135223
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3136223