Submitted to the Journal of High Energy Physics

Abstract Differential dijet cross sections in diffractive deep-inelastic scattering are measured withthe H1 detector at HERA using an integrated luminosity of 51.5 pb \Gamma 1. The selected events are of the type ep! eXY, where the system X contains at least two jets and is wellseparated in rapidity from the low mass proton dissociation system Y. The dijet data arecompared with QCD predictions at next-to-leading order based on diffractive parton distribution functions previously extracted from measurements of inclusive diffractive deep-inelastic scattering. The prediction describes the dijet data well at low and intermediate zIP(the fraction of the momentum of the diffractive exchange carried by the parton entering th

Measurement of Beauty Production at HERAUsing Events with Muons and Jets

Abstract A measurement of the beauty production cross section in ep collisions at a centre-of-massenergy of 319 GeV is presented. The data were collected with the H1 detector at the HERA collider in the years 1999-2000. Events are selected by requiring the presence of jets andmuons in the final state. Both the long lifetime and the large mass of b-flavoured hadronsare exploited to identify events containing beauty quarks. Differential cross sections are measured in photoproduction, with photon virtualities Q2 < 1 GeV2, and in deep inelasticscattering, where 2 < Q2 < 100 GeV2. The results are compared with perturbative QCDcalculations to leading and next-to-leading order. The predictions are found to be somewhat lower than the data