Constraints on R-parity violating couplings from lepton universality

Details Constraints on R-parity violating couplings from lepton universality Constraints on R-parity violating couplings from lepton universality

1999-10-21

arxiv.org/abs/hep-ph/9910435v3

Phys.Rev. D61 (2000) 115005

Physics

High Energy Physics

High Energy Physics - Phenomenology

26pages, 8 postscript figures, REVTeX. Updated references. Typos corrected

Scientific paper

10.1103/PhysRevD.61.115005

We analyze the one loop corrections to leptonic W and Z decays in an R-parity violating extension to the Minimal Supersymmetric Standard Model (MSSM). 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}| < 0.42 and |lambda'_{23k}| < 0.50 at the 2 sigma level. Bounds from W decays are less stringent: |lambda'_{33k}| < 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 Upsilon invisible width.

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