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Determination of the Δ resonance width from lattice QCD
(Proceedings of Science (PoS), 2013)
A method suitable for extracting resonance parameters of unstable baryons in lattice QCD is examined. The method is applied to the strong decay of the Δ to a pion-nucleon state, extracting the pND coupling constant and Δ ...
Novel analysis method for excited states in lattice QCD: The nucleon case
(2015)
We employ a novel method to analyze Euclidean correlation functions entering the calculation of hadron energies in lattice QCD. The method is based on the sampling of all possible solutions allowed by the spectral decomposition ...
Nonperturbative dressing of nucleons by mesons
(1994)
Following Feynman's treatment of the polaron problem we present an approximate non-perturbative method of dressing nucleons by scalar and vector mesons: after integrating out the meson fields in the path integral we perform ...
Comparison of mean-field and exact Monte Carlo solutions of a one-dimensional nuclear model
(1989)
The ground states of nuclear matter and finite nuclei are calculated for a one-dimensional model having a two-body potential with strong short-range repulsion and long-range attraction. Mean-field theory with a phenomenological ...
Stochastic calculation of tunneling in systems with many degrees of freedom
(1988)
A new method is presented for the stochastic solution of tunneling problems in quantum many-body systems. The primary practical problem of trapping in local minima of the action is overcome by extending the standard ...
The proton matrix element of the topological charge in quenched QCD
(1994)
We compute on the lattice the on-shell proton matrix element of the topological charge density in the quenched approximation. Our calculation makes use of a nonperturbative means of determining the multiplicative renormalization ...
Lattice multiplicative renormalization beyond 1-loop
(1994)
This is a progress report on a computational scheme for the perturbative evaluation of lattice renormalization functions. This scheme, implemented as a package on a symbolic manipulation computer language, has already ...
Lattice perturbation theory by computer algebra: A three-loop result for the topological susceptibility
(1994)
We present a scheme for the analytic computation of renormalization functions on the lattice, using a symbolic manipulation computer language. Our first nontrivial application is a new three-loop result for the topological ...
Topological charge density renormalization in the presence of dynamical fermions
(1995)
We study the renormalization group behaviour of the topological charge density in full QCD on the lattice. We propose a way of extracting the necessary renormalization functions from Monte Carlo simulations. © 1995.