HAL : in2p3-00268880, version 1
 arXiv : 0803.3537
 Electroproduction of $\phi(1020)$ Mesons at High $Q^2$ with CLAS
 CLAS Collaboration(s)
 (2008)
 Electroproduction of exclusive $\phi$ vector mesons has been studied with the CLAS detector in the kinematical range $1.6\leq Q^2\leq 3.8$ GeV$^{2}$, $0.0\leq t^{\prime}\leq 3.6$ GeV$^{2}$, and $2.0\leq W\leq 3.0$ GeV. The scaling exponent for the total cross section as $1/(Q^2+M_{\phi}^2)^n$ was determined to be $n=2.49\pm 0.33$. The slope of the four-momentum transfer $t'$ distribution is $b_{\phi}=0.98 \pm 0.17$ GeV$^{-2}$. The data are consistent with the assumption of s-channel helicity conservation (SCHC). Under this assumption, we determine the ratio of longitudinal to transverse cross sections to be $R=0.86 \pm 0.24$. A 2-gluon exchange model is able to reproduce the main features of the data.
 Thème(s) : Physique/Physique Nucléaire Expérimentale
 Lien vers le texte intégral : http://fr.arXiv.org/abs/0803.3537
 in2p3-00268880, version 1 http://hal.in2p3.fr/in2p3-00268880 oai:hal.in2p3.fr:in2p3-00268880 Contributeur : Suzanne Robert <> Soumis le : Mardi 1 Avril 2008, 15:45:14 Dernière modification le : Mardi 1 Avril 2008, 20:33:10