Speaker
Description
We report the current status of first-principles lattice QCD results for the strangeness $S = -1$ sector of baryon-baryon interactions with the physical masses. We measure the two- and four-point functions on the (2+1)-flavor gauge configurations (HAL-conf-2023) [1] generated on the physical point, $(m_\pi, m_K) = (137, 502)~\mathrm{MeV}$. We calculate the Euclidean-time dependence of the potentials by the HAL QCD method [2] for the coupled channel, $N\Lambda$-$N\Sigma$ ($I = 1/2$), and the single channel, $N\Sigma$ ($I = 3/2$). To reduce the inelastic-state contaminations, we further perform the extrapolation to $t \to \infty$ assuming an exponential time dependence of the contaminations. We demonstrate the stability and robustness of the extrapolation, and compare the results with the phase shifts from scattering experiments and femtoscopic correlations from high-energy nuclear collision experiments.
References
- [1] "Scale setting and hadronic properties in the light quark sector with (2+1)-flavor Wilson fermions at the physical point", T. Aoyama, T. M. Doi, T. Doi, E. Itou, Y. Lyu, K. Murakami, T. Sugiura, Phys. Rev. D 110 (2024) 9, 094502.
- [2] N. Ishii, S. Aoki, T. Hatsuda et al. [HAL QCD collaboration], Phys. Rev. Lett. 99 (2007) 022001; Phys. Lett. B 712 (2012) 437; PTEP 2012 (2012) 01A105; Front. in Phys. 8 (2020) 307.