REALISTIC MODELS WITH A LIGHT U(1) GAUGE BOSON COUPLED TO BARYON NUMBER
Abstract
We recently showed that a new gauge boson
γ
B
coupling only to baryon number is phenomenologically allowed, even if
m
B
<
m
Z
and
α
B
≈0.2
. In our previous work we assumed that kinetic mixing between the baryon number and hypercharge gauge bosons (via an
F
μν
B
F
Y
μν
term) was small enough to evade constraints from precision electroweak measurements. In this paper we propose a class of models in which this term is naturally absent above the electroweak scale. We show that the generation of a mixing term through radiative corrections in the low-energy effective theory does not lead to conflict with precision electroweak measurements and may provide a leptonic signal for models of this type at an upgraded Tevatron.