Limits on leptonic photon interactions from SN1987a

Abstract

If massless leptonic photons associated to electron, muon or tau leptonic number exist they would have been emitted from supernova 1987a via the annihilation process $\nu \bar{\nu }\to {\gamma }_l{\gamma }_l$. By requiring that this process does not carry away most of the energy that can be radiated by the supernova we obtain an upper limit on the leptonic photon coupling constants, ${\alpha }_l<5.4\times 10^{-11}$. Under certain assumptions about ${\gamma }_l$ - trapping conditions we find that the region of ${\alpha }_l=10^{-8}-10^{-7}$ might be of interest for an experimental search for leptonic photons.

6 pages, AmSTex, LaTex. The limits are revised for neutrino chemical potential $\mu$ = 0. The new limits do not differ significantly from the original one. To be published in Phys.Lett.B

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