43 citations · 138 across the 10 of their papers we have counts for
10 papers
Spectral sum from Euclidean lattice correlators and determination of renormalization constants
Tsutomu Ishikawa, Shoji Hashimoto, Takashi Kaneko
We propose a new method to renormalize lattice operators. The method is based on the technique to compute the spectral sum appearing in the Shifman-Vainshtein-Zakharov QCD sum rule…
Kondo effect with Wilson fermions
Tsutomu Ishikawa, Katsumasa Nakayama, Kei Suzuki
We investigate the Kondo effect with Wilson fermions. This is based on a mean-field approach for the chiral Gross-Neveu model including four-point interactions between a light Wils…
Spectral sum of current correlators from lattice QCD
Tsutomu Ishikawa, Shoji Hashimoto
We propose a method to use lattice QCD to compute the Borel transform of the vacuum polarization function appearing in the Shifman-Vainshtein-Zakharov QCD sum rule. We construct th…
Lattice-fermionic Casimir effect and topological insulators
Tsutomu Ishikawa, Katsumasa Nakayama, Kei Suzuki
The Casimir effect arises from the zero-point energy of particles in momentum space deformed by the existence of two parallel plates. For degrees of freedom on the lattice, its ene…
Casimir effect for lattice fermions
Tsutomu Ishikawa, Katsumasa Nakayama, Kei Suzuki
We propose a definition of the Casimir energy for free lattice fermions. From this definition, we study the Casimir effects for the massless or massive naive fermion, Wilson fermio…
Reconstruction of smeared spectral function from Euclidean correlation functions
Gabriela Bailas, Shoji Hashimoto, Tsutomu Ishikawa
We propose a method to reconstruct smeared spectral functions from two-point correlation functions measured on the Euclidean lattice. Arbitrary smearing function can be considered…
Charmonium contribution to $B \rightarrow K\ell^+\ell^-: testing the factorization approximation on the lattice
Katsumasa Nakayama, Tsutomu Ishikawa, Shoji Hashimoto
We report the current status of a study of charmonium contribution to on the lattice. Our lattice calculation tests the factorization approximation fo…
Renormalization of bilinear and four-fermion operators through temporal moments
Tsutomu Ishikawa, Katsumasa Nakayama, Shoji Hashimoto
We propose a renormalization scheme that can be simply implemented on the lattice. It consists of the temporal moments of two-point and three-point functions calculated with finite…
mesons as a probe of Casimir effect for chiral symmetry breaking
Tsutomu Ishikawa, Katsumasa Nakayama, Daiki Suenaga +1
We propose mesons as probes to investigate finite-volume effects for chiral symmetry breaking at zero and finite temperature. By using the -flavor linear-sigma model with…
Casimir effect for nucleon parity doublets
Tsutomu Ishikawa, Katsumasa Nakayama, Kei Suzuki
Finite-volume effects for the nucleon chiral partners are studied within the framework of the parity-doublet model. Our model includes the vacuum energy shift for nucleons, which i…