Measurement of exclusive rho0 electroproduction with ZEUS at HERA

Exclusive rho0 electroproduction was measured with the ZEUS detector 
at HERA using an integrated luminosity of 120 pb-1. The data cover photon 
virtualities of 2 < Q2 < 160 GeV2 and gamma* p center-of-mass energies 
of 32 < W < 180 GeV.  The Q2 and W dependence of the gamma* p --> rho0 p 
cross section was determined as well as the distribution of the squared 
four-momentum transfer to the proton. The helicity analysis of the 
decay-matrix elements of the rho was used to extract the ratio of longitudinal 
to transverse gamma* p cross section as a function of Q2 and W. Finally, 
the Pomeron trajectory was extracted.  The results are compared to various 
theoretical predictions.