Speaker
Mr
Ju Hyeong Kang
(Pusan National University)
Description
We investigate supernova cooling bounds on an MeV-scale dark Z boson with mass mixing. For a dark Z much lighter than the Standard Model Z boson, the kinetic mixing contribution to its coupling with the neutral current is strongly suppressed, while the mass mixing contribution remains sizable. This allows the dark Z to be efficiently produced in the dense medium of a core-collapse supernova through the neutral current interactions, particularly through axial-vector couplings. We evaluate the production and absorption of dark Z bosons in the proto-neutron star, including in-medium effects relevant to vector interactions, and obtain cooling bounds based on the observed neutrino signal from SN 1987A.
Authors
Dong-Won Jung
(IBS CTPU-CGA)
Eung Jin Chun
(KIAS)
Mr
Ju Hyeong Kang
(Pusan National University)
Kwang Sik Jeong
(Pusan National University)
Seokhoon Yun
(KNU)