ar X iv : h ep - p h / 93 04 22 6 v 1 6 A pr 1 99 3 Why a Scalar Explanation of the L 3 Events is Implausible ∗

We investigate the question of whether an additional light neutral scalar can explain the llγγ events with high invariant mass photon pairs recently observed by the L3 collaboration. We parameterize the low energy effects of the unknown dynamics in terms of higher dimensional effective operators. We show that operators which allow for the scalar to be produced and decay into photon pairs will allow other observable processes that should have been seen in current experiments. March 1993 MIT-CTP#2191 This work is supported in part by funds provided by the U.S. Department of Energy (DOE) under contract #DE-AC02-76ER03069, by the Texas National Research Laboratory Commission under grant #RGFY92C6 and by CICYT (Spain) under Grant No. AEN90-0040. National Science Foundation Young Investigator Award. Alfred P. Sloan Foundation Research Fellowship. Department of Energy Outstanding Junior Investigator Award.