1 citations · 3 across the 7 of their papers we have counts for
7 papers
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…
Gamma-Ray Signatures of Thermal Misalignment Dark Matter
Koichi Hamaguchi, Ryoichiro Hayakawa, Hiroki Takahashi
Thermal misalignment is a viable dark matter scenario where the misalignment of a dark matter scalar, feebly coupled to the Standard Model particles, is generated through thermal e…
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…
A Generic Analysis of Nucleon Decay Branching Fractions in Flipped SU(5) Grand Unification
Koichi Hamaguchi, Shihwen Hor, Natsumi Nagata +1
In flipped SU(5) grand unified theories, the partial decay lifetimes of certain nucleon decay channels depend generically on an unknown unitary matrix, which arises when left-hande…
Vortex Creep Heating vs. Dark Matter Heating in Neutron Stars
Motoko Fujiwara, Koichi Hamaguchi, Natsumi Nagata +1
Dark matter particles captured in neutron stars deposit their energy as heat. This DM heating effect can be observed only if it dominates over other internal heating effects in NSs…