Wei-Hao Lai1*, Guey-Lin Lin1, Yue-Ling Sming Tsai2, Meng-Ru Wu2
1Institute of Physics, National Chiao Tung University, Hsinchu, Taiwan
2Institute of Physics, Academia Sinica, Taipei, Taiwan
* Presenter:Wei-Hao Lai,
The photon-dark photon mixing is a simple and natural mechanism to explain why the interaction between dark sector and standard model sector is weak. The simplest setup to introduce dark photon is to add a new U(1) gauge group in the Standard Model with charge current interaction. Such framework has been widely studied in the supernova SN1987 explosion because dark photon can bring the energy away from supernova. However, in a more generic point of view, one can extend such dark photon model by introducing a nonzero axial-vector interaction to the Standard Model. The new gauge boson will behave like either dark photon or dark Z so that not only charge current but also neutral current interaction can be important for the supernova constraint. The photon mass term can hence alter the size of mixing parameter. In this work, we investigate the impact from neutral current on mixing parameter and present their new SN1987 constraints.

Keywords: dark photon, neutrino