| Abstract | The cross section of b bar{b} photoproduction in ep collisions is
measured with the H1 detector at HERA. Events containing b-quarks are
identified through detection of two low momentum electrons in the final
state. Semileptonic decays b bar{b} -> ee X are exploited in the
kinematic range of the photon virtuality Q^2 < 1 GeV^2, the
inelasticity 0.2 < y < 0.8 and the pseudorapidity of the b-quarks
|eta(b), eta(bar{b})| < 2. The differential b-quark production cross
section is measured as a function of the transverse b-quark momentum
and extends the previously experimentally accessible phase space towards
the b-quark production threshold. The results are compared to other
b-quark cross section measurements, as well as to QCD predictions. |
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