Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1997-02-22
Phys.Lett.B400:112-116,1997
Physics
High Energy Physics
High Energy Physics - Phenomenology
11 pages, 3 figures, uses epsfig.sty
Scientific paper
10.1016/S0370-2693(97)00351-1
The region of the supersymmetry parameter space, in which charginos decay predominantly into sneutrinos and leptons: chi+ -> \tilde{\nu} + l+, is not excluded experimentally for small mass differences between charginos and sneutrinos. The decay sneutrinos are invisible in R-parity conserving theories since they are either the lightest supersymmetric particles or they decay primarily into the channel: neutrino + lightest neutralino. If the energy of the decay leptons is so small that they escape detection, chargino events e+e- -> chi+chi- in e+e- collisions remain invisible, eroding the excluded chargino mass range at LEP. This region of the supersymmetry parameter space can partly be covered by searching for single W events in e+e- -> W+W-$, with one W boson decaying to leptons or quark jets, but the second W boson decaying to (undetected) charginos and neutralinos.
Kalinowski Jan
Zerwas Peter M.
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