Figures from paper submitted to Physics Letters B

Abstract:

In this letter, the first measurement of the femtoscopic correlation of protons and $Σ^+$ hyperons is presented and used to study the p$-Σ^+$ interaction. The measurement is performed with the ALICE detector in high-multiplicity triggered pp collisions at $\sqrt{s} = 13$ TeV. The $Σ^+$ hyperons are reconstructed using a missing-mass approach in the decay channel to $\textrm{p} + π^0$ with $π^0\rightarrowγγ$, while both $Σ^+$ and protons are identified using a machine learning approach. These techniques result in a high reconstruction efficiency and purity, which allows the measurement of the p$-Σ^+$ correlation function for the first time. Thanks to the high significance achieved in the p$-Σ^+$ correlation signal, it is possible to discriminate between the predictions of different models of the N$-Σ$ interaction and to accomplish a first determination of the p$-Σ^+$ scattering parameters.

Phys. Lett. B 874 (2026) 140252
e-Print: arXiv:2510.14448 | PDF | inSPIRE