Light scalars coupled to photons and non-newtonian forces.
A particle phi coupling to two photons couples also radiatively to charged particles, like protons. If the particle is a light scalar, this induced coupling leads to spin-independent non-Newtonian forces. We show that the experimental constraints on exotic, fifth-type forces lead to stringent constraints on the phigammagamma coupling. We discuss the impact on the recent PVLAS results and the role of paraphoton models introduced to solve the PVLAS-CAST puzzle.
Dupays
Arnaud
A
INAF-IASF, Via E. Bassini 15, I-20133 Milan, Italy.
Massó
Eduard
E
Redondo
Javier
J
Rizzo
Carlo
C