Search for Spontaneous R-parity violation at sqrt(s) = 183 GeV and 189 GeV

Abreu, P.;Cortina Gil, Eduardo;DELPHI Collaboration;et.al.
(2001) Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics — Vol. 502, p. 24-36 (2001)

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Searches for spontaneous R-parity violating signals at sqrt(s) = 183 GeV and sqrt(s) = 189 GeV have been performed using the 1997 and 1998 DELPHI data, under the assumption of R-parity breaking in the third lepton family. The expected topology for the decay of a pair of charginos into two acoplanar taus plus missing energy was investigated and no evidence for a signal was found. The results were used to derive a limit on the chargino mass and to constrain the allowed domains of the MSSM parameter space.
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Abreu, P., Cortina Gil, E., DELPHI Collaboration, & et al. (2001). Search for Spontaneous R-parity violation at sqrt(s) = 183 GeV and 189 GeV. Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics, 502, 24-36. https://doi.org/10.1016/S0370-2693(01)00143-5 (Original work published 2001)