Constraints on R–parity violating couplings from CERN LEP and SLAC SLD hadronic observables

Abstract

We analyze the one loop corrections to hadronic Z decays in an R–parity violating extension to the Minimal Supersymmetric Standard Model (MSSM). Performing a global fit to all the hadronic observables at the Z–peak, we obtain stringent constraints on the R–violating coupling constants λ and λ. The presence of these couplings worsens the agreement with the data relative to the Standard Model. The strongest constraints come from the b asymmetry parameters Ab and AFB(b). From a classical statistical analysis we find that the couplings λi31, λ ′ i32, and λ ′′ 321 are ruled out at the 1σ level, and that λ ′ i33 and λ 33i are ruled out at the 2σ level. We also obtain Bayesian confidence limits for the R–violating couplings. 12.60.Jv, 12.15.Lk, 13.38.Dg Typeset using REVTEX electronic address: lebedev@quasar.phys.vt.edu electronic address: loinaz@alumni.princeton.edu electronic address: takeuchi@vt.edu 1

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Cite this paper

@inproceedings{Lebedev2000ConstraintsOR, title={Constraints on R–parity violating couplings from CERN LEP and SLAC SLD hadronic observables}, author={Oleg V. Lebedev and Tatsu Takeuchi}, year={2000} }