Probing the Light Pseudoscalar Window

Details Probing the Light Pseudoscalar Window Probing the Light Pseudoscalar Window

2003-03-25

arxiv.org/abs/hep-ph/0303215v1

Phys.Rev.D67:115013,2003

Physics

High Energy Physics

High Energy Physics - Phenomenology

22 pages, 4 figures

Scientific paper

10.1103/PhysRevD.67.115013

Very light pseudoscalars can arise from the symmetry-breaking sector in many extensions of the Standard Model. If their mass is below 200 MeV, they can be long-lived and have interesting phenomenology. We discuss the experimental constraints on several models with light pseudoscalars, including one in which the pseudoscalar is naturally fermiophobic. Taking into account the stringent bounds from rare K and B decays, we find allowed parameter space in each model that may be accessible in direct production experiments. In particular, we study the photoproduction of light pseudoscalars at Jefferson Lab and conclude that a beam dump experiment could explore some of the allowed parameter space of these models.

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