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Search for single top production at HERA |
| Reference |
Preliminary expected for EPS07, Spring 2007 |
| Document |
Conference paper or talk
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| Figures |
(1)
(2)
(3)
| | Tables |
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| Contact |
G. Brandt, C.Diaconu |
| Abstract |
A search for single top quark production is performed in $e^\pm p$ collisions at HERA.
The search exploits the full data set with centre of mass energies up to $320$~GeV
corresponding to an integrated luminosity of $482$~pb$^{-1}$.
The investigated model considers anomalous production of top quarks in a
Flavour Changing Neutral Current process involving the coupling $\kappa_{tu\gamma}$.
Decays of top quarks into a\, $b$~quark
and a $W$~boson with subsequent decay of the $W$ in the leptonic electron and muon
channels are included.
A multivariate analysis is performed to
discriminate anomalous top quark production from Standard Model background processes,
dominated by real $W$~production.
An upper limit on the anomalous top production cross section
$\sigma_{ep
ightarrow etX} < 0.16$~pb,
corresponding to $\kappa_{tu\gamma} < 0.14$, is established at the $95\%$
confidence level. |
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