Mini Force: the (B-L) + xY gauge interaction with a light mediator

Understand

The relevant phenomenology and the best search schemes of a subelectroweak-scale gauge boson can be vastly different depending on its coupling.

• For instance, the rare decay into a light gauge boson and the high precision parity test can be sensitive if it has an axial coupling.
• The minimal gauge extension of the standard model with the U(1)_{B-L + xY} requires only three right-handed neutrinos, well-suited to the current neutrino mass and mixing data, and no additional exotic matter fields.
• We study the light gauge boson of this symmetry in detail including its axial coupling property from the hypercharge shift.