Low-lying Lambda Baryons from the Lattice

TL;DR

This study uses lattice QCD with dynamical quarks to determine the masses of Lambda baryons, confirming the Lambda(1405) and analyzing their internal structure and mixing.

Contribution

First lattice QCD calculation with dynamical CI quarks to determine Lambda baryon spectra and analyze octet-singlet mixing.

Findings

Confirmed the Lambda(1405) state.

Provided mass estimates for all four Lambda channels.

Analyzed octet-singlet mixing in Lambda baryons.

Abstract

In a lattice QCD calculation with two light dynamical Chirally Improved (CI) quarks we determine ground state and some excited state masses in all four Lambda baryon channels 1/2^\pm and 3/2^\pm. We perform an infinite volume extrapolation and confirm the widely discussed Lambda(1405). We also analyze the amount of octet-singlet mixing, which is helpful in comparing states with the quark model.