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Investigation of the p-$\Sigma^{0}$ interaction via femtoscopy in pp collisions

The ALICE collaboration
Phys.Lett.B 805 (2020) 135419, 2020.

Abstract (data abstract)
This Letter presents the first direct investigation of the p$-\Sigma^{0}$ interaction, using the femtoscopy technique in high-multiplicity pp collisions at $\sqrt{s} = 13$ TeV measured by the ALICE detector. The $\Sigma^{0}$ is reconstructed via the decay channel to $\Lambda\gamma$, and the subsequent decay of $\Lambda$ to p$\pi^-$. The photon is detected via the conversion in material to e$^+$e$^-$ pairs exploiting the unique capability of the ALICE detector to measure electrons at low transverse momenta. The measured p$-\Sigma^{0}$ correlation indicates a shallow strong interaction. The comparison of the data to several theoretical predictions obtained employing the Correlation Analysis Tool using the Schrödinger Equation (CATS) and the Lednický$-$Lyuboshits approach shows a reasonable agreement. The presented femtoscopic data cannot yet discriminate between different models, which is also the case for the available scattering and hypernuclei data. Nevertheless, the p$-\Sigma^{0}$ correlation function is found to be sensitive to the strong interaction, and driven by the interplay of the different spin and isospin channels. This pioneering study demonstrates the feasibility of a femtoscopic measurement in the p$-\Sigma^{0}$ channel and with the expected larger data samples in LHC Run 3 and Run 4, the p$-\Sigma^{0}$ interaction will be constrained with high precision.

  • Table 1

    Data from Figure 2


    Measured p$-$p $\oplus$ $\overline{\mathrm{p}}-\overline{\mathrm{p}}$ correlation function.

  • Table 2

    Data from Figure 3


    Measured correlation function of p$-\Sigma^{0}$p $\oplus$ $\overline{\mathrm{p}}-\overline{\Sigma^{0}}$

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