Showing papers by "P. D. Thompson published in 1999"
TL;DR: In this paper, the NLO gluon momentum distribution in the proton, x g g (x g ), has been extracted in the momentum fraction range 7.5 × 10 −4 x g −2 at average scales μ 2 = 25 to 50 GeV 2.
68 citations
TL;DR: In this paper, the cross-sections of forward jets with a polar angle to the proton direction are presented as a function of Bjorken-x for forward jets produced by a single particle and a single jet.
46 citations
TL;DR: In this paper, the internal jet structure in dijet production in deepinelastic scattering is measured with the H1 detector at HERA, and a cone jet with transverse energies ET,Breit > 5 GeV is selected in the Breit frame employing k⊥ and cone jet algorithms.
35 citations
TL;DR: In this paper, a model based on a factorisable diffractive exchange with a gluon dominated structure, evolved to a scale set by the transverse momentum of the outgoing partons from the hard interaction, is presented.
Abstract: Interactions of the type ep → eXY are studied, where the component X of the hadronic final state contains two jets and is well separated in rapidity from a leading baryonic system Y. Analyses are performed of both resolved and direct photoproduction and of deep-inelastic scattering with photon virtualities in the range 7.5 < Q
2 < 80 GeV2. Cross sections are presented where Y has mass M
Y
< 1.6 GeV, the squared four-momentum transferred at the proton vertex satisfies |t| < 1 GeV2 and the two jets each have transverse momentum p
T
jet
> 5 GeV relative to the photon direction in the rest frame of X. Models based on a factorisable diffractive exchange with a gluon dominated structure, evolved to a scale set by the transverse momentum
$$\hat p_T $$
of the outgoing partons from the hard interaction, give good descriptions of the data. Exclusive
$$q\bar q$$
production, as calculated in perturbative QCD using the squared proton gluon density, represents at most a small fraction of the measured cross section. The compatibility of the data with a breaking of diffractive factorisation due to spectator interactions in resolved photoproduction is investigated.
27 citations
16 Sep 1999
1 citations