(eng)
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
Piotrzkowski, Krzysztof ; Chekanov, S. ; de Favereau, J. ; et. al. Exclusive electroproduction of phi mesons at HERA. In: Nuclear Physics, Section B, Vol. 718, no. 1-2, p. 3-31 (2005)