Speaker
Barbara Alexandra Cid Mora
Description
This talk presents results of the first coupled-channel meson-baryon $\pi\Sigma - \bar{K}N$ computation from lattice QCD in the $\Lambda(1405)$ 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 $\Sigma\pi$ threshold and a resonance pole below the $N\bar{K}$.
Primary authors
Amy Nicholson
(University of North Carolina)
Andrew Hanlon
(Brookhaven National Laboratory)
André Walker-Loud
(Berkeley National Laboratory)
Barbara Alexandra Cid Mora
Ben Hörz
(Intel Deutschland GmbH)
Colin Morningstar
(Carnegie Mellon University)
Daniel Mohler
(Technische Universität Darmstadt)
Fernando Romero-López
(MIT)
John Bulava
(Ruhr Universitäat Bochum)
Joseph Moscoso
(University of North Carolina)
Sarah Skinner
(Carnegie Mellon University)
