Electroproduction of $\phi(1020)$ Mesons at High $Q^2$ with CLAS

Abstract : 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.
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Preprints, Working Papers, ...
To be submitted to Phys Rev C, 15 pages, 18 figures. 2008
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http://hal.in2p3.fr/in2p3-00268880
Contributor : Suzanne Robert <>
Submitted on : Tuesday, April 1, 2008 - 3:00:45 PM
Last modification on : Tuesday, April 1, 2008 - 8:00:33 PM

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• HAL Id : in2p3-00268880, version 1
• ARXIV : 0803.3537

Citation

J. P. Santoro, E. S. Smith, M. Garçon, M. Guidal, J. M. Laget, et al.. Electroproduction of $\phi(1020)$ Mesons at High $Q^2$ with CLAS. To be submitted to Phys Rev C, 15 pages, 18 figures. 2008. <in2p3-00268880>

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