Ryosuke Sato

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hep-ph2026

Excluding MeV-scale QCD axions by $K_{L} \to π^{0} π^{0} a$ at KTeV

Takaya Iwai, Ryosuke Sato, Kohsaku Tobioka +1

An interesting proposal suggests that a QCD axion $(a)$ coupling to the up quark, down quark, and electron remains viable for an axion mass near 10~MeV. In this paper, this possibi…

hep-ph2026

A particle on a ring or: how I learned to stop worrying and love $θ$ -vacua

Mohammad Aghaie, Ryosuke Sato

Recently, Ai, Cruz, Garbrecht, and Tamarit (arXiv:2001.07152, arXiv:2404.16026, arXiv:2511.04216) claimed that the strong CP problem can be avoided by adopting a particular order o…

hep-ph2025

QCD axion from chiral gauge theories

Ryosuke Sato, Shonosuke Takeshita

We present models of axion based on supersymmetric chiral gauge theories. In these models, the PQ symmetry is spontaneously broken by the non-perturbative dynamics of chiral gauge…

Excluding MeV-scale QCD axions by KL​→π0π0a at KTeV

A particle on a ring or: how I learned to stop worrying and love θ-vacua

QCD axion from chiral gauge theories

Excluding MeV-scale QCD axions by $K_{L} \to π^{0} π^{0} a$ at KTeV

A particle on a ring or: how I learned to stop worrying and love $θ$ -vacua