385 citations · 3.7k across the 95 of their papers we have counts for
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From the LZ Event to Grand Unification: Heavy Higgsinos and Proton Decay
Shihwen Hor, Natsumi Nagata, Tsutomu T. Yanagida
The recently reported LUX-ZEPLIN (LZ) event has renewed interest in inelastic Higgsino dark matter. While a weak-scale Higgsino provides a simple interpretation of the event, such…
Complementary Probes of Light Higgsinos: Electroweak Precision Measurements and Dark Matter Direct Detection
Koichi Hamaguchi, Natsumi Nagata, Genta Osaki
Although higgsinos are well motivated to be light from the viewpoint of naturalness, they remain difficult to detect experimentally because they interact only through electroweak i…
Deformations of Starobinsky Inflation in No-Scale SU(5) and SO(10) GUTs
John Ellis, Marcos A. G. Garcia, Natsumi Nagata +2
The original Starobinsky model of inflation is consistent with Planck and other measurements of the CMB, but recent results from the ACT and SPT Collaborations hint that…
Axion Emission from Proton Cooper Pairs in Neutron Stars
Koichi Hamaguchi, Natsumi Nagata, Jiaming Zheng
We investigate axion emission from singlet proton Cooper pairs in neutron stars, a process that dominates axion emission in young neutron stars in the KSVZ model. By re-deriving it…
Wormhole-Induced ALP Dark Matter
Dhong Yeon Cheong, Koichi Hamaguchi, Yoshiki Kanazawa +3
Non-perturbative gravitational effects induce explicit global symmetry breaking terms within axion models. These exponentially suppressed terms in the potential give a mass contrib…
Exploring Chirality Structure in Nucleon Decay
Koichi Hamaguchi, Shihwen Hor, Natsumi Nagata +1
Baryon number conservation is an accidental symmetry in the Standard Model, but its violation is theoretically anticipated, making the search for such processes a promising avenue…