HAL : in2p3-00524503, version 1
 arXiv : 1010.1466
 Physical Review Letters 106 (2011) 081801
 Search for single vectorlike quarks in ppbar collisions at sqrt(s) = 1.96 TeV
 D0 Collaboration(s)
 (2011)
 We present a search for hypothetical vector-like quarks in ppbar collisions at sqrt(s) = 1.96 TeV. The data were collected by the D0 detector at the Fermilab Tevatron Collider and correspond to an integrated luminosity of 5.4 fb^(-1). We select events with a final state composed of a W or Z boson and a jet consistent with a heavy object decay. We observe no significant excess in comparison to the background prediction and set limits on production cross sections for vector-like quarks decaying to W+jet and Z+jet. Assuming a vector-like quark to standard model quark coupling parameter $\tilde{\ kappa}_{qQ}$ of unity, we exclude vector-like quarks with mass below 693 GeV for decays to W+jet and mass below 449 GeV for decays to Z+jet. These are the most stringent mass limits for electroweak single vector-like quark production at hadron colliders.
 Thème(s) : Physique/Physique des Hautes Energies - Expérience
 Lien vers le texte intégral : http://fr.arXiv.org/abs/1010.1466
 in2p3-00524503, version 1 http://hal.in2p3.fr/in2p3-00524503 oai:hal.in2p3.fr:in2p3-00524503 Contributeur : Emmanuelle Vernay <> Soumis le : Vendredi 8 Octobre 2010, 09:18:25 Dernière modification le : Jeudi 10 Mars 2011, 16:51:23