Particle Seminar

Wednesday, August 14, 2019

Speaker: Jim Cline

Affiliation: McGill

Time: 10:30 AM - 11:30 AM

Location: HP 4351

Title: Dark matter-neutron mixing?

Abstract: It has been proposed that neutrons may have an invisible 
decay mode into dark matter, due to mass mixing between the DM 
and the neutron, motivated by discrepancies between the neutron 
lifetime as measured by decay-in-flight versus bottle experiments. 
This scenario is highly constrained by neutron stars and dark matter 
phenomenology. I will describe a model with a subdominant 
component of elementary dark matter and dark photons, that can 
be compatible with all the constraints. Alternatively, the new physics 
particle could have an asymmetry and constitute all the dark matter 
in the universe. In this case, its mixing with the visible neutron can 
lead to a novel mechanism of low-scale baryogenesis, starting from 
an asymmetry in the dark sector, by neutron-dark matter oscillations.