REALISTIC MODELS WITH A LIGHT U(1) GAUGE BOSON COUPLED TO BARYON NUMBER

Abstract

We recently showed that a new gauge boson ${\gamma }_B$ coupling only to baryon number is phenomenologically allowed, even if $m_B<m_Z$ and ${\alpha }_B\approx 0.2$. In our previous work we assumed that kinetic mixing between the baryon number and hypercharge gauge bosons (via an $F_B^{\mu \nu }{F}_{\mu \nu }^Y$ 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.

21 pages, LaTeX, 4 figures in a uuencoded compressed postscript file.

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