Possible Light U(1) Gauge Boson Coupled to Baryon Number

Abstract

We discuss the phenomenology of a light U(1) gauge boson, ${\gamma }_B$, that couples only to baryon number. We assume that the new U(1) gauge symmetry is spontaneously broken and that the ${\gamma }_B$ mass is smaller than $m_Z$. Nevertheless, we show that the model survives the current experimental constraints. In addition, we argue that evidence for the existence of such a particle could be hidden in existing LEP and Tevatron data. We determine the allowed regions of the $m_B$-${\alpha }_B$ plane, where $m_B$ is the ${\gamma }_B$ mass, and where $4\pi {\alpha }_B$ is the squared gauge coupling. We point out that in some parts of the allowed parameter space our model can account for rapidity gap events in proton-antiproton scattering seen at the Fermilab Tevatron.

11 pages, LaTeX, 4 figures in a uuencoded compressed postscript file. We add a comment on the possible kinetic mixing between the U(1)_Y and U(1)_B gauge bosons, and include an important reference to the work of Nelson and Tetradis

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