Constraints on R-parity violating couplings from lepton universality

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American Physical Society

We analyze the one loop corrections to leptonic W and Z decays in an R-parity violating extension to the minimal supersymmetric standard model. We find that lepton universality violation in the Z line-shape variables alone would strengthen the bounds on the magnitudes of the lambda' couplings, but a global fit on all data leaves the bounds virtually unchanged at \lambda'(33k)\less than or equal to 0.42 and \lambda'(23k)\less than or equal to 0.50 at the 2 sigma level. Bounds from W decays are less stringent: \lambda'(33k)\less than or equal to 2.4 at 2 sigma, as a consequence of the weaker Fermilab experimental bounds on lepton universality violation in W decays. We also point out the potential of constraining R-parity violating couplings from the measurement of the Y invisible width.

fermion pair production, supersymmetric models, qed corrections, standard model, oscillation, breaking, Astronomy & Astrophysics, Physics
Lebedev, O ; Loinaz, W ; Takeuchi, T, JUN 1 2000. “Constraints on R-parity violating couplings from lepton universality,” PHYSICAL REVIEW D 61(11): 115005. DOI: 10.1103/PhysRevD.61.115005