Spectral analysis of excited nucleons in lattice QCD with maximum entropy method
نویسندگان
چکیده
منابع مشابه
Spectral Analysis of Excited Nucleons in Lattice QCD with Maximum Entropy Method
We study the mass spectra of excited baryons with the use of the lattice QCD simulations. We focus our attention on the problem of the level ordering between the positive-parity excited stateN (1440) (the Roper resonance) and the negative-parity excited state N(1535). Nearly perfect parity projection is accomplished by combining the quark propagators with periodic and anti-periodic boundary con...
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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 × 32, 24 × 32 and 32 × 32, at β = 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...
متن کاملSpectral function and excited states in lattice QCD with the maximum entropy method
~CP-PACS Collaboration! Institute of Physics, University of Tsukuba, Tsukuba, Ibaraki 305-8571, Japan Center for Computational Physics, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan Institute for Cosmic Ray Research, University of Tokyo, Kashiwa, Chiba 277-8582, Japan High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan ~Received 30 May 2001; published...
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Employing the maximum entropy method we extract the spectral functions from meson correlators at four lattice spacings in quenched QCD with the Wilson quark action. We confirm that the masses and decay constants, obtained from the position and the area of peaks, agree well with the results from the conventional exponential fit. For the first excited state, we obtain mπ1 = 660(590) MeV, mρ1 = 15...
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First principle calculation of the QCD spectral functions (SPFs) based on the lattice QCD simulations is reviewed. Special emphasis is placed on the Bayesian inference theory and the Maximum Entropy Method (MEM), which is a useful tool to extract SPFs from the imaginary-time correlation functions numerically obtained by the Monte Carlo method. Three important aspects of MEM are (i) it does not ...
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ژورنال
عنوان ژورنال: Physics Letters B
سال: 2005
ISSN: 0370-2693
DOI: 10.1016/j.physletb.2005.07.026