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Measurements of cross sections for beauty and charm events with dijets and amuon in the photoproduction regime at HERA are presented. The data werecollected with the H1 detector and correspond to an integrated luminosity of179 pb^{-1}. Events with dijets of transverse momentum P_T^{jet1} > 7 GeV andP_T^{jet2} > 6 GeV in the pseudorapidity range -1.5< \eta^{jet} < 2.5 in thelaboratory frame are selected in the kinematic region of photon virtuality Q^2< 2.5 GeV^2 and inelasticity 0.2 < y < 0.8. One of the two selected jets mustbe associated to a muon with P_T^{\mu} > 2.5 GeV in the pseudorapidity range-1.3 < \eta^{\mu} < 1.5. The fractions of beauty and charm events aredetermined using the impact parameters of the muon tracks with respect to theprimary vertex and their transverse momentum relative to the axis of theassociated jet. Both variables are reconstructed using the H1 vertex detector.The measurements are in agreement with QCD predictions at leading andnext-to-leading order.

Measurement of Beauty and Charm Photoproduction using Semi-muonic Decays in Dijet Events at HERA