Production of neutral bosons by an electron beam

We investigate the possible existence of neutral bosons which are coupled to leptons. The cross section for the process e+p→e+X+anything, where X is a neutral boson of spin-parity 0± of 1± emitted by the electron, is calculated and its energy-angle distribution discussed. Assuming X to decay predominantly into a lepton pair we investigate the characteristics of the background. It is pointed out that the signal-to-background ratio can be greatly enhanced if one selects high x=EX/E1 and also uses the outgoing electron as a tag at a slightly nonforward angle with the X particle arranged in such a way that the momentum transfer to the target particle is near its minimum. This happens when the outgoing electron momentum P2 is parallel to P1-k, where P1 and k are the momenta of the incident electron and the X particle, respectively