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Abstract
Recent results on diffraction from the H1 and ZEUS experiments at HERA are presented. Measurement of open charm production in diffractive DIS has been performed by the H1 experiment using the event topology, given by ep → eXY, where the system X, containing at least one D*(2010) meson, is separated from a leading low-mass proton dissociative system Y by a large rapidity gap. The photoproduction of isolated photons is measured using diffractive events recorded by the ZEUS experiment. Cross sections are evaluated in the photon transverse-energy and pseudorapidity ranges 5 < EγT < 15 GeV and -0:7 < ηγ < 0:9, inclusively and with a jet with transverse-energy and pseudorapidity in the ranges 4 < EjetT < 35 GeV and -1:5 < ηjet < 1:8. The exclusive deep inelastic electroproduction and photoproduction of Ψ(2S ) and J=Ψ(1S) mesons has been also studied by ZEUS. The cross-section ratio σ(Ψ(2S))=σ(J=Ψ(1S)) has been measured as a function of Q2, W and t. The results are compared to several predictions of QCD-inspired models, providing tests of the models in a region of soft to hard diffraction.
Highlights
Diffractive interactions are a distinctive class of hadronic interactions in which the scattering of the incoming particle is mediated by an exchanged object carrying vacuum quantum numbers, commonly referred to as the Pomeron [1, 2]
At the HERA ep collider, diffractive processes have been studied both in photoproduction and in deep inelastic scattering (DIS), photoproduction processes being those in which the exchanged photon is quasireal. Diffractive processes of this kind are typically characterised by a forward nucleon or nucleonic state that is separated by a gap in rapidity from the hadronic final state produced in the central region of the event
Measurements of diffractive processes are presented below based on data collected by the H1 and ZEUS experiments at the HERA Collider, where beams of electrons/positrons of energy 27.5 GeV were collided with proton√s of energy 920 GeV
Summary
Diffractive interactions are a distinctive class of hadronic interactions in which the scattering of the incoming particle is mediated by an exchanged object carrying vacuum quantum numbers, commonly referred to as the Pomeron [1, 2]. Measurements of diffractive processes are presented below based on data collected by the H1 and ZEUS experiments at the HERA Collider, where beams of electrons/positrons of energy 27.5 GeV were collided with proton√s of energy 920 GeV. D* diffractive fraction in DIS H1 Data NLO QCD
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