The production of beauty quarks in ep interactions has been studied with the
ZEUS detector at HERA for exchanged four-momentum squared Q^2 > 10 GeV^2, using
an integrated luminosity of 363 pb^{-1}. The beauty events were identified
using electrons from semileptonic b decays with a transverse momentum 0.9 <
p_T^e < 8 GeV and pseudorapidity |eta^e| < 1.5. Cross sections for beauty
production were measured and compared with next-to-leading-order QCD
calculations. The beauty contribution to the proton structure function F_2 was
extracted from the double-differential cross section as a function of Bjorken-x
and Q^2.
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