1.

On experimental confirmation of the corrections to Fermi’s golden rule
/ Ishikawa, K ; Jinnouchi, O ; Kubota, A ; Sloan, T ; et al
Standard calculations by Fermi’s golden rule involve approximations. [...]
Published in PTEP 2019 (2019) 033B02
10.1093/ptep/ptz006
arXiv:1901.03019
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2.

Nucleon form factors and rootmeansquare radii on a ${\left(10.8\text{}\text{}\mathrm{fm}\right)}^{4}$ lattice at the physical point
/ Shintani, Eigo ; Ishikawa, KenIchi ; Kuramashi, Yoshinobu ; Sasaki, Shoichi ; et al
We present the nucleon form factors and rootmeansquare (RMS) radii measured on a ${\left(10.8\text{}\text{}\mathrm{fm}\right)}^{4}$ lattice at the physical point. [...]
Published in Physical Review D 99 (2019)
10.1103/PhysRevD.99.014510
arXiv:1811.07292
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3.

Finite size effect on pseudoscalar meson sector in $2+1$ flavor QCD at the physical point
/ Ishikawa, K.I. ; Ishizuka, N. ; Kuramashi, Y. ; Nakamura, Y. ; et al
We investigate the finite size effect on pseudoscalar meson masses and decay constants using a subset of the “PACS10” configurations which are generated keeping the spacetime volumes over $(10\text{}\text{}\mathrm{fm}{)}^{4}$ in $2+1$ flavor QCD at the physical point. [...]
Published in Physical Review D 99 (2019)
10.1103/PhysRevD.99.014504
arXiv:1807.06237
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4.

Calculation of $K\to \pi \pi $ decay amplitudes with an improved Wilson fermion action in a nonzero momentum frame in lattice QCD
/ Ishizuka, N. ; Ishikawa, K.I. ; Ukawa, A. ; Yoshié, T.
We present our result for the $K\to \pi \pi $ decay amplitudes for both the $\Delta I=1/2$ and $3/2$ processes with the improved Wilson fermion action. [...]
Published in Physical Review D 98 (2018)
10.1103/PhysRevD.98.114512
arXiv:1809.03893
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5.

Particle decay in Gaussian wavepacket formalism revisited
/ Ishikawa, Kenzo ; Oda, Kinya
We derive Fermi’s golden rule in the Gaussian wavepacket formalism of quantum field theory, proposed by Ishikawa, Shimomura, and Tobita, for particle decay within a finite time interval. [...]
Published in PTEP 2018 (2018) 123B01
10.1093/ptep/pty127
arXiv:1809.04285
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6.

Nucleon form factors on a large volume lattice near the physical point in $2+1$ flavor QCD
/ Ishikawa, KenIchi ; Kuramashi, Yoshinobu ; Sasaki, Shoichi ; Tsukamoto, Natsuki ; et al
We present results for the isovector nucleon form factors measured on a $9{6}^{4}$ lattice at almost the physical pion mass with a lattice spacing of 0.085 fm in $2+1$ flavor QCD. [...]
Published in Physical Review D 98 (2018)
10.1103/PhysRevD.98.074510
arXiv:1807.03974
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7.

Utility of geometry in lattice QCD simulations
/ Ukita, Naoya ; Ishikawa, KenIchi ; Kuramashi, Yoshinobu
We propose a way to improve the resolution of the spatial momentum and the time interval for hadron propagators utilizing the lattice geometry. [...]
Published in Physical Review D 98 (2018)
10.1103/PhysRevD.98.014515
arXiv:1805.10821
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8.

Nonperturbative determination of the Λparameter in the pure SU(3) gauge theory from the twisted gradient flow coupling
/ Ishikawa, KenIchi ; Kanamori, Issaku ; Murakami, Yuko ; Nakamura, Ayaka ; et al
We evaluate the Λparameter in the M S ¯ $$ \overline{\mathrm{MS}} $$ scheme for the pure SU(3) gauge theory with the twisted gradient flow (TGF) method. [...]
Published in JHEP 1712 (2017) 067
10.1007/JHEP12(2017)067
arXiv:1702.06289
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9.

IR fixed points in SU(3) gauge theories
/ Ishikawa, K.I. ; Iwasaki, Y. ; Nakayama, Yu ; Yoshie, T.
We propose a novel RG method to specify the location of the IR fixed point in lattice gauge theories and apply it to the SU(3) gauge theories with Nf fundamental fermions. [...]
Published in Physics letters B (2015)
10.1016/j.physletb.2015.07.019
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10.

Anomalous radiative transitions
/ Ishikawa, Kenzo ; Tajima, Toshiki ; Tobita, Yutaka
Anomalous transitions involving photons derived by manybody interaction of the form in the standard model are studied for the first time. [...]
Published in PTEP 2015 (2015) 013B02
10.1093/ptep/ptu168
arXiv:1409.4339
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