# Measurement of d$^\star$ meson cross-sections at Hera and determination of the gluon density in the proton using NLO QCD

Abstract : 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 Q^2>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, x_g g(x_g), has been extracted in the momentum fraction range 7.5x10^{-4}< x_g <4x10^{-2} at average scales mu^2 =25 to 50 GeV2. The gluon momentum fraction x_g 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 F_2.
Document type :
Journal articles

http://hal.in2p3.fr/in2p3-00003649
Contributor : Magali Damoiseaux <>
Submitted on : Wednesday, May 26, 1999 - 5:11:15 PM
Last modification on : Wednesday, April 7, 2021 - 3:26:01 PM

### Citation

C. Adloff, M. Anderson, V. Andreev, B. Andrieu, V. Arkadov, et al.. Measurement of d$^\star$ meson cross-sections at Hera and determination of the gluon density in the proton using NLO QCD. Nuclear Physics B, Elsevier, 1999, 545, pp.21-44. ⟨in2p3-00003649⟩

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