  Recent results on open beauty production in positron-proton collisions at a
centre-of-mass energy of 300 GeV are presented. The beauty photoproduction
cross section is measured by ZEUS and H1 via the semileptonic decay. Both
experiments use the transverse lepton momentum with respect to a jet as an
observable. The H1 central silicon vertex detector makes it possible to
analyse, in addition, the lepton impact parameter spectrum, thus exploiting
lifetime information for the first time at HERA. The combined lifetime and
transverse momentum signature is further used to observe beauty production for
the first time in deep inelastic scattering. All results are compared with NLO
QCD calculations.
