A Search for Squarks of Rp-Violating SUSY at HERA

Abstract

A search for squarks of R-parity violating supersymmetry is performed in $ep$ collisions at HERA using H1 1994 $e^{+}$ data. Direct single production of squarks of each generation by $e^{+}$-quark fusion via a Yukawa coupling ${\lambda }^{\prime }$ is considered. All possible R-parity violating decays and gauge decays of the squarks are taken into account. No significant deviation from the Standard Model predictions is found in the various multi-lepton and multi-jet final states studied and exclusion limits are derived. At 95% confidence level, the existence of first generation squarks is excluded for masses up to $240 \GeV $ for coupling values ${\lambda }^{\prime }\gtrsim \sqrt{4\pi {\alpha }_{em}}$.The limits obtained are shown to be only weakly dependent on the free parameters of the Minimal Supersymmetric Standard Model. Stop squarks are excluded for masses up to $138 \GeV$ for coupling ${\lambda }^{\prime }\times \cos {\theta }_t$ to $e^{+}d$ pairs $\gtrsim 0.1\times \sqrt{4\pi {\alpha }_{em}}$, where ${\theta }_t$ is the mass mixing angle. Light stop squarks are furthermore searched for through pair production in $\gamma$-gluon fusion processes. No signal is observed and exclusion limits are derived. Masses in the range 9 to $24.4 \GeV$ are excluded at 95% confidence level for ${\lambda }^{\prime }\times \cos {\theta }_t>10^{-4}$.

arXiv comment31 pages, latex, 11 Figures

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