295 articles – 2215 Notices  [english version]
 HAL : in2p3-00255874, version 1
 arXiv : 0802.1858
 Physics Letters B 663 (2008) 382-389
 A Search for Excited Neutrinos in e-p Collisions at HERA
 H1 Collaboration(s)
 (2008)
 A search for excited neutrinos is performed using the full $e^{-}p$ data sample collected by the H1 experiment at HERA at a centre-of-mass energy of 319 GeV, corresponding to a total luminosity of 184 pb$^{-1}$.The electroweak decays of excited neutrinos ${\nu}^{*}{\to}{\nu}{\gamma}$, ${\nu}^{*}{\to}{\nu}Z$ and ${\nu}^{*}{\to}eW$ with subsequent hadronic or leptonic decays of the $W$ and $Z$ bosons are considered. No evidence for excited neutrino production is found. Mass dependent exclusion limits on $\nu^*$ production cross sections and on the ratio of the coupling to the compositeness scale $f/{\Lambda}$ are derived within gauge mediated models. A limit on $f/{\Lambda}$, independent of the relative couplings to the SU(2) and U(1) gauge bosons, is also determined. These limits extend the excluded region to higher masses than has been possible in previous excited neutrino searches.
 Thème(s) : Physique/Physique des Hautes Energies - Expérience
 Lien vers le texte intégral : http://fr.arXiv.org/abs/0802.1858
 in2p3-00255874, version 1 http://hal.in2p3.fr/in2p3-00255874 oai:hal.in2p3.fr:in2p3-00255874 Contributeur : Danielle Cristofol <> Soumis le : Jeudi 14 Février 2008, 12:29:28 Dernière modification le : Lundi 2 Juin 2008, 09:51:56