1999/10/31 by Oleg Lebedev, Will Loinaz, Tatsu Takeuchi
Physics and Astronomy · #hep-ph
paper · pdf · doi:10.1103/physrevd.61.115005
published as Phys.Rev. D61 (2000) 115005 · 26pages, 8 postscript figures, REVTeX. Updated references. Typos corrected
arxiv created 1999/12/10 · arxiv updated 2009/11/30
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.