Pinning down the Glue in the Proton

Details Pinning down the Glue in the Proton Pinning down the Glue in the Proton

1995-02-17

arxiv.org/abs/hep-ph/9502336v1

Phys.Lett.B354:155-162,1995

Physics

High Energy Physics

High Energy Physics - Phenomenology

8 pages, LATEX, 6 figs available as .uu file

Scientific paper

10.1016/0370-2693(95)00646-3

The latest measurements of $F_2$ at HERA allow for a {\it combination} of gluon and sea quark distributions at small $x$ that is significantly different from those of existing parton sets. We perform a new global fit to deep-inelastic and related data. We find a gluon distribution which is larger for $x \lapproxeq 0.01$, and smaller for $x \sim 0.1$, and a flatter input sea quark distribution than those obtained in our most recent global analysis. The new fit also gives $\alpha_s(M_Z^2) = 0.114$. We study other experimental information available for the gluon including, in particular, the constraints coming from fixed-target and collider prompt $\gamma$ production data.

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