Excited nucleon spectrum from lattice QCD with maximum entropy method

Abstract

We study excited states of the nucleon in quenched lattice QCD with the spectral analysis using the maximum entropy method. Our simulations are performed on three lattice sizes $16^3\times 32$, $24^3\times 32$ and $32^3\times 32$, at $\beta =6.0$ to address the finite volume issue. We find a significant finite volume effect on the mass of the Roper resonance for light quark masses. After removing this systematic error, its mass becomes considerably reduced toward the direction to solve the level order puzzle between the Roper resonance $N^{\prime }(1440)$ and the negative-parity nucleon $N^{\ast }(1535)$.

Lattice2003(spectrum), 3 pages, 4 figures

References in corpus (2)

• Maximum Entropy Analysis of the Spectral Functions in Lattice QCD
• Negative-parity Baryon Masses using an O(a)-improved Fermion Action

Cited by in corpus (6)

• Excited hadrons on the lattice: Baryons
• Spectral Analysis of Excited Nucleons in Lattice QCD with Maximum Entropy Method
• Spatially improved operators for excited hadrons on the lattice
• Baryon Spectroscopy in Lattice QCD
• Isolating Excited States of the Nucleon in Lattice QCD
• Extracting excited states from lattice QCD: the Roper resonance