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We discuss the phenomenology of a light U (1) gauge boson, ₁, that couples only to baryon number. We assume that the new U (1) gauge symmetry is spontaneously broken and that the ₁ mass m₁ is smaller than mₙ. We show for m_<m₁<mₙ that the ₁ coupling ₁ can be as large as 0. 1 without conflicting with the current experimental constraints. We argue that ₁0. 1 is large enough to produce visible collider signatures and that evidence for the ₁ could be hidden in existing LEP data. We point out that ₁ exchange can account for rapidity gap events in p-p scattering seen at the Tevatron.
Carone et al. (Mon,) studied this question.