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.

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

References in corpus (8)

• First observation of an attractive interaction between a proton and a multi-strange baryon
• Study of the $\Lambda$-$\Lambda$ interaction with femtoscopy correlations in pp and p-Pb collisions at the LHC
• Non-thermal p/pi ratio at LHC as a consequence of hadronic final state interactions
• Uniform description of bulk observables in the hydrokinetic model of A+A collisions at RHIC and LHC
• Coupled-channel effects in hadron-hadron correlation functions
• Determination of the eta'-proton scattering length in free space
• Extracting baryon-antibaryon strong interaction potentials from p$\bar{\Lambda }$ femtoscopic correlation function
• Extracting femtoscopic radii in the presence of significant additional correlation sources

Cited by in corpus (12)

• The ALICE experiment: a journey through QCD
• Study of the strong interaction among hadrons with correlations at the LHC
• Study of the $DK$ interaction with femtoscopic correlation functions
• Hyperon electromagnetic form factors in the timelike region
• Strangeness $S=-2$ baryon-baryon interactions and femtoscopic correlation functions in covariant chiral effective field theory
• Investigating the role of strangeness in baryon$-$antibaryon annihilation at the LHC
• Kaon-proton strong interaction at low relative momentum via femtoscopy in Pb-Pb collisions at the LHC
• A method to remove lower order contributions in multi-particle femtoscopic correlation functions
• Corrections to the hadron resonance gas from lattice QCD and their effect on fluctuation-ratios at finite density
• Exploring the N$\Lambda$-N$\Sigma$ coupled system with high precision correlation techniques at the LHC
• Studying baryon production using two-particle angular correlations
• Unfolding the effects of final-state interactions and quantum statistics in two-particle angular correlations