1998/12/18 by C. Adloff, M. Anderson, V. Andreev +97 · 2 citations
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ex
paper · pdf · doi:10.1016/s0550-3213(99)00119-4
published as Nucl.Phys.B545:21-44,1999 · 27 pages, 9 figures, 2 tables, submitted to Nucl. Phys. B
arxiv created 1998/12/18 · openalex publication_date 1999/04/01 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/01
With the H1 detector at the ep collider HERA, D* meson production cross sections have been measured in deep inelastic scattering with four-momentum transfers Q2>2 GeV2 and in photoproduction at energies around W(gamma p)~ 88 GeV and 194 GeV. Next-to-Leading Order QCD calculations are found to describe the differential cross sections within theoretical and experimental uncertainties. Using these calculations, the NLO gluon momentum distribution in the proton, xg g(xg), has been extracted in the momentum fraction range 7.5x10-4< xg <4x10-2 at average scales mu2 =25 to 50 GeV2. The gluon momentum fraction xg has been obtained from the measured kinematics of the scattered electron and the D* meson in the final state. The results compare well with the gluon distribution obtained from the analysis of scaling violations of the proton structure function F2.