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hep-ph2026
Anomaly-free axion-like particle in Nelson-Barr models
Mohammad Aghaie, Ryoma Masuda, Ryosuke Sato
We study Nelson--Barr models with a discrete symmetry that solve the strong CP problem through spontaneous CP violation, and show that they naturally predict a light axion-li…
hep-ph2026
Generalizations and UV completions of Cho-Maison monopole
Fukutaro Miya, Ryosuke Sato
A monopole configuration in the electroweak theory was constructed by Cho and Maison, allowing for a singular behavior at the origin. Since the essential structure of the Cho-Maiso…
hep-ph2026
Sommerfeld enhancement from unstable final-state particles in dark matter annihilation
Tomohiro Abe, Ryosuke Sato, Takumu Yamanaka
We study the Sommerfeld enhancement of the annihilation cross section of dark matter into heavier unstable particles. In this process, the annihilation products become non-relativi…