What can the L 3 γγll events be ?
نویسندگان
چکیده
We consider the 4 γγll (l = μ, e) events reported by the L3 collaboration, and go through the logical possibilities which could explain the events. If they are not coincidental bremsstrahlung events, we find that the physics which they could point to is extremely limited. One possibility would be to have a new 60 GeV scalar (or pseudoscalar) particle X0 with an off-diagonal coupling to a Z and Z ′ which is nonperturbative (α > 1), where the Z ′ couplings to νν̄ are suppressed. One could also construct a model involving X0, and a second scalar X ′0 with a large X ll coupling. We do not promote either of these models, but hope they would prove to be useful guidelines, should the L3 events turn out to be new physics.
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تاریخ انتشار 1992