Exclusive electroproduction of phi mesons at HERA
(2005) Nuclear Physics, Section B —
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- (en) Exclusive electroproduction of $\phi$ mesons has been studied in $e^\pm p$ collisions at $\sqrt{s}=318 \gev$ with the ZEUS detector at HERA using an integrated luminosity of 65.1 pb$^{-1}$. The $\gamma^*p$ cross section is presented in the kinematic range $2<Q^2<70 \gev^2$, $35<W<145 \gev$ and ${|t|}<0.6 \gev^2$. The cross sections as functions of $Q^2$, $W$, $t$ and helicity angle $\theta_h$ are compared to cross sections for other vector mesons. The ratios $R$ of the cross sections for longitudinally and transversely polarized virtual photons are presented as functions of $Q^2$ and $W$. The data are also compared to predictions from theoretical models. Comment: 29 pages, 10 figures, 7 tables, accepted by Nucl. Phys. B
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Piotrzkowski, K., Chekanov, S., de Favereau, J., & et al. (2005). Exclusive electroproduction of phi mesons at HERA. Nuclear Physics, Section B. https://doi.org/10.1016/j.nuclphysb.2005.04.009