Experimental consequences of no-scale supergravity in light of the CDF $eeγγ$ event

J. Lopez; D. Nanopoulos

doi:10.1103/PhysRevD.55.4450

paper

Experimental consequences of no-scale supergravity in light of the CDF $ee γ γ$ event

arXiv:hep-ph/9608275 · doi:10.1103/PhysRevD.55.4450

Abstract

We explore two possible interpretations for the CDF $ee γ γ + E_{T} /$ event in the context of a recently proposed one-parameter no-scale supergravity model with a light gravitino. We delineate the region in parameter space consistent with the kinematics of the event interpreted either as selectron pair-production ( $p p ˉ \to e ~^{+} e ~^{-} X$ , $e ~ = e ~_{R}, e ~_{L}$ ) or as chargino pair-production ( $p p ˉ \to χ_{1}^{+} χ_{1}^{-} X$ ). In the context of this model, the selectron interpretation requires $e ~ = e ~_{R}$ and predicts comparable rates for $ℓ^{\pm} γ γ + E_{T} /$ , whereas the chargino interpretation predicts comparable rates for $(ℓ^{\pm} ℓ^{^{'} +} ℓ^{^{'} -}, ℓ^{+} ℓ^{-}, ℓ^{+} ℓ^{-} j j) γ γ + E_{T} /$ . We also consider the constraints from LEP~1.5 and the expectations for LEP~2. We point out that one of the acoplanar photon pairs observed by the OPAL collaboration at LEP~1.5 may be attributable to supersymmetry in the present model via $e^{+} e^{-} \to χ_{1}^{0} χ_{1}^{0} \to γ γ + E_{T} /$ . We also show how similar future events at LEP~2 may be used to deduce the neutralino mass.

36 pages, LaTeX, 19 figures (included)

Experimental consequences of no-scale supergravity in light of the CDF $ee γ γ$ event

Abstract

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Experimental consequences of no-scale supergravity in light of the CDF eeγγ event

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Experimental consequences of no-scale supergravity in light of the CDF $ee γ γ$ event