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Supersymmetric $W$ Boson Decays as a Means to Search for Charginos and Neutralinos

Jan Kalinowski
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Abstract

If the sneutrino mass is below the chargino mass, the dominant decay mode of the lightest chargino is via a two-body decay channel $χ^{\pm}_1 \ra \tildeν + l^{\pm}$. Sneutrinos are invisible in $R$-parity conserving supersymmetric models and, if the mass gap $m(χ^{\pm}_1)-m(\tildeν)$ is sufficiently small, the soft decay lepton may escape detection leading to invisible chargino decays. This ``blind spot'' of the supersymmetry parameter space would jeopardize the chargino search at LEP2. We point out that such a scenario can be tested by searching for single $W$ events in $e^+e^- \ra W^+W^-$, with one $W$ boson decaying to visible leptons or quark jets, and the second $W$ boson decaying to invisible charginos and neutralinos.

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Jan Kalinowski. 1997-03-26. Supersymmetric $W$ Boson Decays as a Means to Search for Charginos and Neutralinos. https://arxiv.org/abs/hep-ph/9703431

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