Light scalars coupled to photons and non-newtonian forces
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A particle $ϕ$ coupling to two photons couples also to charged particles, like protons, through a loop. If the particle is a light scalar this induced coupling to protons leads to non-newtonian forces. We show that the experimental constraints on exotic, fifth-type forces lead to stringent constraints on the $ϕγγ$ coupling.
With respect to v1, we have extended the paper, also new authors have joined. Submitted to PRL
With respect to v1, we have extended the paper, also new authors have joined. Submitted to PRL