Measurement of the longitudinal proton structure function at HERA

                 ZEUS Collaboration

                    Abstract

The reduced cross sections for ep deep inelastic scattering have been
measured with the ZEUS detector at HERA at three different centre-of-mass
energies, 318, 251 and 225 GeV. From the cross sections, measured double 
differentially in Bjorken x and the virtuality, Q2, the proton structure 
functions F_L and F_2 have been extracted in the region 
0.0005<x<0.007 and 20<Q2<130 GeV^2.