Excited nucleon spectrum from lattice QCD with maximum entropy method

Details Excited nucleon spectrum from lattice QCD with maximum entropy method Excited nucleon spectrum from lattice QCD with maximum entropy method

2003-09-29

arxiv.org/abs/hep-lat/0309177v1

Physics

High Energy Physics

High Energy Physics - Lattice

Lattice2003(spectrum), 3 pages, 4 figures

Scientific paper

10.1016/S0920-5632(03)02533-7

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 $N'(1440)$ and the negative-parity nucleon $N^*(1535)$.

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