B-Meson Cross Section

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	The transverse momentum pt of a muon relative to a jet is larger in events with B mesons compared to other production mechanisms of muons. muons resulting from B decay may reach large pt due to the large mass difference between the B meson and the muon. muons resulting from pion decay essentially reflect the pt of the parent pion due to the small mass difference.
The cross section for B-production in the kinematic range 0.1<y<0.8, Q^2<1 GeV^2, pt(muon)>2 GeV and 35<polar angle(muon)<130deg  is 0.93+/-0.08+0.17-0.07 nb (H1 preliminary)  which is 5 times larger than expected from a direct photoproduction processes as calculated using a leading order QCD generator with parton showers.