Effects of Lepton Flavour Violation on Chargino Production at the Linear Collider

Abstract

We study the effects of lepton flavour violation (LFV) on the production processes e+e- --> χ+_i χ-_j at a linear collider with longitudinal e+ and e- beam polarizations. In the case of LFV the sneutrino mass eigenstates have no definite flavour, therefore, in the t-channel more than one sneutrino mass eigenstate can contribute to the chargino production cross sections. Our framework is the Minimal Supersymmetric Standard Model (MSSM) including LFV terms. We show that in spite of the restrictions on the LFV parameters due to the current limits on rare lepton decays, the cross section σ(e+e- --> χ+_1 χ-_1) can change by a factor of 2 or more when varying the LFV mixing angles. We point out that even if the present bound on BR(tau- --> e- gamma) improves by a factor of thousand the influence of LFV on the chargino production cross section can be significant. These results could have an important impact on the strategies for determining the underlying model parameters at the linear collider.

arXiv comment11pp; final version for JHEP

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Cited by in corpus (4)

• Physics at the e+ e- Linear Collider
• Measuring Lepton Flavour Violation at LHC with Long-Lived Slepton in the Coannihilation Region
• Impact of slepton generation mixing on the search for sneutrinos
• Long-Lived Slepton in the Coannihilation Region and Measurement of Lepton Flavour Violation at LHC