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Search for Bosonic Stop Decays in R-Parity Violating Supersymmetry in e+q Collisions at HERA |
| Reference |
Publication is expected before DIS2004, Spring 2004 |
| Figures |
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| Contact |
A. Vest |
| Abstract |
A search for scalar top quarks in R-parity violating supersymmetry is
performed in $e^+ p$ collisions at HERA using the H1 detector.
The data taken at \mbox{$\sqrt{s}=319\gev$} and
\mbox{$\sqrt{s}=301\gev$} correspond to an integrated luminosity of
$105.8\pbarnt$.
The resonant production of scalar top quarks $ ilde{t}$ in positron
quark fusion via a Yukawa coupling $\lambda'$ is considered with the
subsequent bosonic stop decay $ ilde{t}
ightarrow ilde{b} W$.
The R-parity violating decay of the sbottom quark $ ilde{b}
ightarrow
d ar
u_e$ is considered, and leptonic and hadronic $W$ decay channels
are analysed.
No evidence for stop production is found in the bosonic stop decay nor
in the direct R-parity violating decay $ ilde{t}
ightarrow eq$.
Mass dependent limits on $\lambda'$ are obtained in the framework of the
Minimal Supersymmetric Standard Model.
Stop quarks with masses below $275\gev$ are excluded at $95\%$
confidence level in a large part of the parameter space for a Yukawa
coupling of electromagnetic strength. |
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