2 citations · 2 across the 12 of their papers we have counts for
8 papers
Light neutrinophilic WIMP in the model
Tatsuya Aonashi, Shigeki Matsumoto, Yu Watanabe +1
Sub-GeV dark matter is an appealing thermal target because it can still be produced via the standard freeze-out mechanism; at such low masses, achieving freeze-out naturally points…
Detecting Sterile Neutrino Dark Matter at MeV Gamma-Ray Observatories
Subaru Fujisawa, Tatsuya Hayashi, Shigeki Matsumoto +1
We explore the indirect detection of sterile neutrino dark matter within the gauged extension of the Standard Model, in which three right-handed neutrinos account for…
Indirect Detection of Dark Matter Around a Supermassive Black Hole with High Energy-Resolution Gamma-Ray Telescopes
Yu Watanabe, Alexander Kusenko, Shigeki Matsumoto
We explore whether the unprecedented energy resolution of upcoming gamma-ray telescopes can uncover relativistic effects in photon spectra resulting from dark matter (DM) annihilat…
Light WIMPs and MeV Gamma-ray Detection with COSI
Yu Watanabe, Shigeki Matsumoto, Christopher M. Karwin +6
Light weakly interacting massive particles (WIMPs), whose masses are in the sub-GeV scale, have been attracting more attention due to the negative results searching for traditional…
Enhancing Compton telescope imaging with maximum a posteriori estimation: a modified Richardson-Lucy algorithm for the Compton Spectrometer and Imager
Hiroki Yoneda, Thomas Siegert, Israel Martinez-Castellanos +23
We present a modified Richardson-Lucy (RL) algorithm tailored for image reconstruction in MeV gamma-ray observations, focusing on its application to the upcoming Compton Spectromet…
Féeton dark matter above the threshold
Tatsuya Hayashi, Shigeki Matsumoto, Yuki Watanabe +1
The new gauge boson introduced in the minimal extension of the standard model (SM) by gauging the U(1) symmetry plays the role of dark matter when the U(1)…
Mediator Decay through mixing with Degenerate Spectrum
Ayuki Kamada, Takumi Kuwahara, Shigeki Matsumoto +2
The decay of the mediator particle into standard model (SM) particles plays a significant role in exploring the dark sector scenario. We consider such a decay, taking the dark phot…
Decay of the Mediator Particle at Threshold
Shigeki Matsumoto, Yu Watanabe, Yuki Watanabe +1
A light mediator particle is often predicted in the dark sector scenario, which weakly interacts with the standard model (SM) particles. The weakness of the interaction is usually…