Résumé du preprint Irfu-08-44
| Irfu-08-44 |
|---|
| Electroproduction of phi(1020) mesons at high Q2 with CLAS |
| J.P. Santoro et al (M. Garçon, J.M. Laget, J. Ball, R. De Masi, F.X. Girod, C. Marchand, L. Morand, S. Morrow, S. Procureur, F. Sabatié) |
| 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. |