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2009 Europhysics Conference on High Energy Physics (EPS HEP 2009), Krakow : Pologne (2009)
Searches for excited fermions at HERA
Z. Zhang1
H1 Collaboration(s)
(2009)

Searches for excited electrons, excited neutrinos and excited quarks are perfomed using the full $e^{\pm}p$ data sample collected by the H1 experiment at HERA, corresponding to a total luminosity of 475 pb$^{-1}$. The electroweak decays of excited fermions into standard model fernions and $\gamma$, $Z$ or $W$ bosons are considered. No evidence for excited fermion production is found. Mass dependent exclusion limits on excited fermion production cross sections and on the ratio $f/{\Lambda}$ of the coupling to the compositeness scale are derived within gauge mediated models.
1 :  LAL - Laboratoire de l'Accélérateur Linéaire
Physique/Physique des Hautes Energies - Expérience
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EPS-HEP_2009_270.pdf(79.5 KB)