What can the L3 $γγll$ events be?

Details What can the L3 $γγll$ events be? What can the L3 $γγll$ events be?

1992-12-16

arxiv.org/abs/hep-ph/9212272v1

Phys.Lett. B317 (1993) 462-466

Physics

High Energy Physics

High Energy Physics - Phenomenology

7 pp (3 fig avail. on request), LATEX, TRI-PP-92-124

Scientific paper

10.1016/0370-2693(93)91025-I

We consider the 4 $\gamma\gamma ll$ ($l=\mu,\ e$) 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 $X^0$ with an off-diagonal coupling to a $Z$ and $Z'$ which is non-perturbative ($\alpha > 1$), where the $Z'$ couplings to $\nu\bar\nu$ are suppressed. One could also construct a model involving $X^0$, 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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