Pinning down the glue in the proton

The latest measurements of F2 at HERA allow for a combination of gluon and sea quark distributions at small x that is significantly different from those of existing parton sets. We perform two new global fits to deep-inelastic and related data. The preferred fit has a gluon distribution which is larger for x ≲ 0.01, and smaller for x ∼ 0.1, and a flatter input sea quark distribution than those obtained in our most recent global analysis. This fit also gives αs(MZ2) = 0.114. We study other experimental information available for the gluon including, in particular, the constraints coming from fixed-target and collider prompt γ production data.