PT Journal
AU Camalich, JM
   Terol-Calvo, J
   Tolos, L
   Ziegler, R
TI Supernova constraints on dark flavored sectors
SO Physical Review D
JI Phys. Rev. D
PY 2021
BP L121301 - 7pp
VL 103
IS 12
DI 10.1103/PhysRevD.103.L121301
AB Proto-neutron stars forming a few seconds after core-collapse supernovae are hot and dense environments where hyperons can be efficiently produced by weak processes. By making use of various state-of-the-art supernova simulations combined with the proper extensions of the equations of state including Lambda hyperons, we calculate the cooling of the star induced by the emission of dark particles X-0 through the decay Lambda -> nX(0). Comparing this novel energy-loss process to the neutrino cooling of SN 1987A allows us to set a stringent upper limit on the branching fraction, BR(Lambda -> nX(0)) <= 8 x 10(-9), that we apply to massless dark photons and axions with flavor-violating couplings to quarks. We find that the new supernova bound can be orders of magnitude stronger than other limits in dark-sector models.
ER