Two-Photon Channel in B−L Models

In this paper we examine the possibility of having an exception to the recent observation by L. Randall amd M. Wise, which states that “a significant branching ratios to both e + e − and γ γ is possible only if new physics beyond that in the SM couples directly to electrons”. We consider resonances decaying into diphotons and dielectrons final states predicted in U (1) B − L extensions of the SM. We find that these new resonances can’t decay into e + e − and γ γ final states with comparably measurable branching ratios although such resonances are directly coupled to electrons.