Measurement of the inclusive di-jet cross section in photoproduction and determination of an effective parton distribution in the photon.

The H1 collaboration
Eur.Phys.J.C 1 (1998) 97-107, 1998.

Abstract (data abstract)
DESY-HERA. Measurement of the inclusive 2-JET cross section in photoproduction and determination of an Effective Parton Distribution in the photon. Integrated luminocity used for this analysis is 2.9 1/pb. Data were taken in 1994. & apos;The photoproduction events were selected by requiring that the scattered electron remains in the beam pipe (untagged events), therefore photon virtuality Q2& lt;4 GeV2, where 80 PCT of the events have Q2& lt;0.1 GeV2& apos;. X(C=GAMMA) = (E(jet1)*EXP(-ETARAP(jet1))+E(jet2)*EXP(-ETARAP(jet2) ))/ (2*Y*E_e) is the fraction of quasi-real photon momentum carried by its parton, where Y is the fraction of the lepton beam energy carried by quasi-real photon: Y = E_gamma/E_e. ET is in GeV.

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    Effective photon parton distribution in the form X(C=GAMMA)*PDF(X,PT**2). The second systematic error is due to the uncertainty in the extraction...

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