Speaker
Anirudhan Alanthatta Madathil
(University of Utah)
Description
Supernovae provide among the most powerful probes of weakly-coupled new particles in the MeV mass range, where laboratory experiments lose sensitivity. In this work, we constrain the mixing angle $\sin \theta$ of a Higgs mixed scalar to five orders of magnitude below the existing collider bounds ($\sin \theta \sim 10^{-9}$) using an improved supernovae cooling bound and with new decay-based constraints from the galactic 511 keV positron flux and energy deposition in low-energy Type II-P supernovae. We also extend our analysis to a hadrophilic scalar model, constraining Yukawa couplings down to $y_N \sim 10^{-10}$.
Authors
Anirudhan Alanthatta Madathil
(University of Utah)
Dr
Gustavo Marques-Tavares
(University of Utah)
Dr
Melissa Joseph
(University of Utah)
Samuel Liebersbach
(University of Utah)