87 research outputs found
Hadronic matrix elements of proton decay on the lattice
We report on our on-going project to calculate proton decay matrix elements
using domain-wall fermions on the lattice. By summarizing the history of the
proton decay calculation on the lattice, we reveal the systematic errors of
those calculations. Then we discuss our approach to tackle those uncertainties
and show our preliminary results on the matrix elements.Comment: 4 pages, 2 figures, talk presented at CIPANP2003: Conference on the
Intersections of Particle and Nuclear Physics, New York City, May 19-24, 200
Improving chiral property of domain-wall fermions by reweighting method
The reweighting method is applied to improve the chiral property of
domain-wall fermions. One way to achieve this is to enlarge , the size of
fifth dimension, which controls the size of the induced chiral symmetry
breaking. While this is a type of reweighting method for shifting the action
parameter, it seems non-trivial since this reweighting means change of the five
dimensional lattice volume. In this report, we address issues in this direction
of reweighting and evaluate its effectiveness.Comment: 7 pages, talk presented at The XXVII International Symposium on
Lattice Field Theory, July 26-31 2009, Peking University, Beijing, Chin
Nucleon Decay with Domain-Wall Fermions
We report on our on-going project to calculate the nucleon decay matrix
elements with domain-wall fermions. Operator mixing is discussed employing a
non-perturbative renormalization. Bare matrix elements of all the possible
decay modes induced by the dimension-six operators are calculated with the
direct method, which are compared with the indirect calculation using chiral
perturbation theory.Comment: Lattice2003(matrix), 3 pages, 2 figure
Axial symmetry at high temperature in 2-flavor lattice QCD
We investigate the axial symmetry breaking above the critical
temperature in two-flavor lattice QCD. The ensembles are generated with
dynamical M\"obius domain-wall or reweighted overlap fermions. The
susceptibility is extracted from the low-modes spectrum of the overlap Dirac
eigenvalues. We show the quark mass and temperature dependences of
susceptibility. Our results at imply that the
symmetry is restored in the chiral limit. Its coincidence with vanishing
topological susceptibility is observed.Comment: 8 pages, 4 figures, Proceedings of the 35th International Symposium
on Lattice Field Theory, June 18-24, 2017, Granada, Spai
Nucleon Decay Matrix Elements for Domain-Wall Fermions
We report on the nucleon decay matrix elements with domain-wall fermions in
quenched approximation. Results from direct and indirect method are compared
with a focus on the process of a proton decaying to a pion and a lepton. We
discuss the renormalization necessary for the matching to the continuum theory.
Preliminary results for the renormalized chiral lagrangian parameters are
presented.Comment: Lattice2002(matrixel), 3 pages, 1 figur
Axial U(1) symmetry and Dirac spectra in high-temperature phase of lattice QCD
The axial symmetry in the high-temperature phase is investigated with
lattice QCD simulations. The gauge ensembles are generated with
M\"obius domain-wall fermions, and the overlap/domain-wall reweighting is
applied. We find that the susceptibility evaluated from the spectrum
of overlap-Dirac eigenvalues is strongly suppressed in the chiral limit. We
also study its volume dependence.Comment: 7 pages, 2 figures, talk presented at the 36th International
Symposium on Lattice Field Theory (Lattice 2018), 22-28 July, 2018, Michigan,
US
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