| Abstract: | Photoproduction of beauty and charm quarks in events with at least two jets
has been measured with the ZEUS detector at HERA using an integrated luminosity
of 133 $pb^{-1}$. The fractions of jets containing b and c quarks were
extracted using the invariant mass of charged tracks associated with secondary
vertices and the decay-length significance of these vertices. Differential
cross sections as a function of jet transverse momentum, $p_{T}^{ ext{jet}}$,
and pseudorapidity, $eta^{ ext{jet}}$, were measured. The data are compared
with previous measurements and are well described by next-to-leading-order QCD
predictions. |
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