The negative-parity spin-1/2 Λ baryon spectrum from lattice QCD and effective theory

Λ(1405) and Negative-Parity Baryons in Lattice QCD

We review briefly recent studies of the Λ(1405) spectrum in Lattice QCD. Ordinary three-quark pictures of the Λ(1405) in quenched Lattice QCD fail to reproduce the mass of the experimental value, which seems to support the penta-quark picture for the Λ(1405) such as a K̄N molecule-like state. It is also noted that the present results suffer from relatively large systematic uncertainties coming f...

Negative-parity baryon spectra in quenched anisotropic lattice QCD

We investigate the negative-parity baryon spectra in quenched lattice QCD. We employ the anisotropic lattice with standard Wilson gauge and O(a) improved Wilson quark actions at three values of lattice spacings with renormalized anisotropy ξ = aσ/aτ = 4, where aσ and aτ are spatial and temporal lattice spacings, respectively. The negative-parity baryons are measured with the parity projection. ...

Spin and parity measurement of the Λ(1405) baryon

Baryon Spectroscopy from Lattice QCD

Experiments show that many excited-state hadrons exist, and there are significant experimental efforts to map out the QCD resonance spectrum, such as Hall B and the proposed Hall D at Jefferson Lab, ELSA associated with the University of Bonn, COMPASS at CERN, PANDA at GSI, and BESIII in Beijing. Hence, there is a great need for ab initio determinations of such states in lattice QCD. To extract...

Negative-Parity Baryon Spectroscopy

Results are reported for the first calculation of the low-lying spin-1/2 odd-parity octet baryon masses using O(a) improved gluon and fermion actions. Methods for removing even-parity ground-state contaminations from the two-point correlation functions at zero and finite momenta are outlined. We investigate the properties of two odd-parity interpolating fields based on the established interpola...