Speaker
Yongchao Zhang
(Southeast University)
Description
We update the SN1987A constraints on the dark photon and $Z'$ bosons in the $U(1)_{B-L}$ model, in the approximation of one-pion exchange for nucleon-bremsstrahlung process. The dependence on the supernova profiles and geometric effects are taken into account. For the $U(1)_{L_\mu - L_\tau}$ model, the production of the $Z'$ boson is dominated by the lepton pair coalescence and semi-Compton processes.
Authors
Zun Wang
(Southeast University)
Yongchao Zhang
(Southeast University)