Speaker
Description
Author: Yanou Cui
Abstract: Core-collapse supernovae (CCSNe) can copiously produce millicharged particles (MCPs) through plasmon decay and electron-positron annihilation in their hot, dense cores. Because MCPs are massive, their arrival at Earth is delayed relative to the neutrino burst by an amount that depends on the MCP mass, with delays ranging from days to years. This delayed arrival opens a clean observational window in terrestrial detectors after the neutrino signal has passed. We compute the expected electron-recoil signals at XENONnT, JUNO, DUNE, and Hyper-K for a Galactic supernova, and derive the corresponding sensitivity. We show that a future Galactic supernova can probe regions of MCP parameter space beyond existing constraints from supernova-cooling.