Contreras, J.G.
E+ P --> E+ CHARGED X
Double Differential Cross Section
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rivet Analysis
Charged particle cross-sections in photoproduction and extraction of the gluon density in the photon

The H1 collaboration Adloff, C. ; Anderson, M. ; Andreev, V. ; et al.
Eur.Phys.J.C 10 (1999) 363-372, 1999.
Inspire Record 477556 DOI 10.17182/hepdata.44170

Photoproduction data collected with the H1 detector at HERA in 1994 are used to study the cross-sections for inclusive charged particle production and the structure of the photon. The differential cross-sections dsigma/dpT2, for |eta| < 1 in the HERA laboratory frame, and dsigma/deta for pT > 2 GeV/c and pT > 3 GeV/c have been measured. Model calculations of these cross-sections, based on perturbative QCD, indicate that the results are sensitive to the parton densities of the photon as well as to higher order effects, which are phenomenologically treated by multiple interactions. This sensitivity is exploited to determine the leading order x_gamma distribution of partons in the photon using a new method based on high pT charged particles. The gluon content of the photon is extracted and found to rise with decreasing x_gamma.

2 data tables
Table 1

Inclusive gamma-p cross section for charged particles in the photoproduction data.

Table 2

The measured differential pseudorapidity distribution for inclusive chargedparticle production.