Hadron Spectroscopy with Strangeness

The pole nature of the Λ(1405): A lattice QCD calculation

4 Apr 2024, 11:00

30m

Main building, Room 253 (University of Glasgow)

Session 5

Speaker

Barbara Alexandra Cid Mora

Description

This talk presents results of the first coupled-channel meson-baryon $\pi \mathrm{\Sigma }-\overline{K}N$ computation from lattice QCD in the $\mathrm{\Lambda }(1405)$ region. Correlation functions were calculated using a single ensemble with pion mass $m_{\pi }=200$ MeV and kaon mass $m_{\mathrm{K}}=487$ MeV, and included single- and multi-hadron operators. Once the finite-volume energy spectra were reliably extracted, the Lüscher method was employed to study scattering amplitudes. The final results exhibited two poles in the complex energy plane of the two-channel $K$-matrix for all parametrizations used. Their locations correspond to a virtual bound state below $\mathrm{\Sigma }\pi$ threshold and a resonance pole below the $N\overline{K}$.

Presentation materials

HadSpecStrangeness24_CidMora.pdf