General properties of the decay amplitudes for massless particles
Abstract
We derive the kinematical constraints which characterize the decay of any massless particle in flat spacetime. We show that in perturbation theory the decay probabilities of photons and YangMills bosons vanish to all orders and the decay probability of gravitons vanishes to oneloop order for graviton loops and to all orders for matter loops, A general power counting argument indicates in which conditions a decay of a massless particle could be possible: the Lagrangian should contain a selfcoupling without derivatives and with a coupling constant of positive mass dimension.
URI
http://dx.doi.org/10.1016/05503213(96)00346Xhttps://www.sciencedirect.com/science/article/pii/055032139600346X
http://hdl.handle.net/10863/5950
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