Measurement of the p$-Σ^+$ correlation function in pp collisions at $\sqrt{\textit{s}}=13$ TeV

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