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Reduced Fine-Tuning in Supersymmetry with R-parity violation

Linda M. Carpenter, David E. Kaplan, Eun-Jung Rhee

Abstract

Both electroweak precision measurements and simple supersymmetric extensions of the standard model prefer a mass of the Higgs boson less than the experimental lower limit of 114 GeV. We show that supersymmetric models with R parity violation and baryon number violation have a significant range of parameter space in which the Higgs dominantly decays to six jets. These decays are much more weakly constrained by current LEP analyses and would allow for a Higgs mass near that of the $Z$. In general, lighter scalar quark and other superpartner masses are allowed and the fine-tuning typically required to generate the measured scale of electroweak symmetry breaking is ameliorated. The Higgs would potentially be discovered at hadron colliders via the appearance of new displaced vertices. The lightest neutralino could be discovered by a scan of vertex-less events LEP I data.

Reduced Fine-Tuning in Supersymmetry with R-parity violation

Abstract

Both electroweak precision measurements and simple supersymmetric extensions of the standard model prefer a mass of the Higgs boson less than the experimental lower limit of 114 GeV. We show that supersymmetric models with R parity violation and baryon number violation have a significant range of parameter space in which the Higgs dominantly decays to six jets. These decays are much more weakly constrained by current LEP analyses and would allow for a Higgs mass near that of the . In general, lighter scalar quark and other superpartner masses are allowed and the fine-tuning typically required to generate the measured scale of electroweak symmetry breaking is ameliorated. The Higgs would potentially be discovered at hadron colliders via the appearance of new displaced vertices. The lightest neutralino could be discovered by a scan of vertex-less events LEP I data.

Paper Structure

This paper contains 6 equations, 2 figures.

Figures (2)

  • Figure 1: A random scan of the parameters $\mu$ and $\tan\beta$ with $M_2=250$ GeV, $M_1=50$ GeV and $m_{higgs} = 100$ GeV. The borders between the alternating black and gray points represent Higgs branching ratios to neutralinos of (from left to right) 90%, 85%, 80%, 75%, and 70% respectively. The white space to the left is excluded by the chargino mass bound.
  • Figure 2: The lightest chargino mass versus lightest neutralino mass in a scan of $\mu$ (from 120 to 250 GeV), $\tan\beta$ (2 to 5), $M_1$ (10-100 GeV), and $M_2$ (150-400 GeV). For all points, the branching ratio to neutralinos is at least 75%.