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Multi-lepton production at high transverse momenta in ep collisions at HERA
(2008)Physics Letters BProcesses leading to a final state with at least two high transverse momentum leptons (electrons or muons) are studied using the full e ± p data sample collected by the H1 experiment at HERA. The data correspond to an integrated luminosity of 463 pb -1. Di-lepton and tri-lepton event classes are investigated. Cross sections of the production of e + e - and μ + μ - pairs are derived in a restricted phase space dominated by photon-photon ...Journal Article -
Measurement of deeply virtual Compton scattering and its t-dependence at HERA
(2008)Physics Letters BA measurement of elastic deeply virtual Compton scattering γ * p → γ p using e - p collision data recorded with the H1 detector at HERA is presented. The analysed data sample corresponds to an integrated luminosity of 145 pb -1. The cross section is measured as a function of the virtuality Q 2 of the exchanged photon and the centre-of-mass energy W of the γ * p system in the kinematic domain 6.5 < Q 2 < 80 GeV 2, 30 < W < 140 GeV and | t ...Journal Article -
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Measurement of Isolated Photon Production in Deep-Inelastic Scattering at HERA
(2008)The European Physical Journal CThe production of isolated photons in deep-inelastic scattering ep→eγX is measured with the H1 detector at HERA. The measurement is performed in the kinematic range of negative four-momentum transfer squared 4<Q2<150 GeV2 and a mass of the hadronic system WX>50 GeV. The analysis is based on a total integrated luminosity of 227 pb-1. The production cross section of isolated photons with a transverse energy in the range 3<ET γ<10 GeV and ...Journal Article -
Three- and four-jet production at low x at HERA
(2008)The European Physical Journal CThree- and four-jet production is measured in deep-inelastic ep scattering at low x and Q2 with the H1 detector using an integrated luminosity of 44.2 pb-1. Several phase space regions are selected for the three-jet analysis in order to study the underlying parton dynamics from global topologies to the more restrictive regions of forward jets close to the proton direction. The measurements of cross sections for events with at least three ...Journal Article