722 articles – 3202 Notices  [english version]
 HAL : in2p3-00178310, version 1
 arXiv : 0709.2917
 Physical Review D 76 (2007) 111104
 Measurement of the $p\bar{p}\to WZ + X$ cross section at $\sqrt{s}$=1.96 TeV and limits on WWZ trilinear gauge couplings
 D0 Collaboration(s)
 (2007)
 We present measurements of the process $p\bar{p} \to WZ+X \to \ell^{\prime} \nu_{\ell^{\prime}} \ell \bar{\ell}$ at $\sqrt{s}=1.96$ TeV, where $\ell$ and $\ell^{\prime}$ are electrons or muons. Using 1 fb$^{-1}$ of data from the D0 experiment, we observe 13 candidates with an expected background of $4.5\pm0.6$ events and measure a cross section $\sigma(WZ)=2.7^{+1.7}_{-1.3}$ pb. From the number of observed events and the $Z$ boson transverse momentum distribution, we limit the trilinear $WWZ$ gauge couplings to $-0.17 \le \lambda_Z \le 0.21$ $(\Delta \kappa_Z = 0)$ at the 95% C.L. for a form factor scale $\Lambda=2$ TeV. Further, assuming that $\Delta g^Z_1 = \Delta\kappa_Z$, we find $-0.12 \le \Delta\kappa_Z \le 0.29$ $(\lambda_Z=0)$ at the 95% C.L. These are the most restrictive limits on the $WWZ$ couplings available to date.
 Thème(s) : Physique/Physique des Hautes Energies - Expérience
 Lien vers le texte intégral : http://fr.arXiv.org/abs/0709.2917
 in2p3-00178310, version 1 http://hal.in2p3.fr/in2p3-00178310 oai:hal.in2p3.fr:in2p3-00178310 Contributeur : Emmanuelle Vernay <> Soumis le : Mercredi 10 Octobre 2007, 16:31:01 Dernière modification le : Lundi 7 Janvier 2008, 09:55:04