Structure Function Results from ZEUS

Abstract This contribution presents recent ZEUS results on proton structure functions at HERA. The inclusive φ(1020)-meson cross section was measured, and it was used to determine the s -quark content of the proton. The structure function F 2 was extracted using initial-state radiative events. Neutral and charged current cross sections were used to extract the structure function xF 3 and measure the mass of the W boson, respectively. A NLO QCD fit to ZEUS data and fixed target cross sections was employed to determine the parton density functions of the quarks and of the gluon inside the proton.