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The production of beauty and charm quarks in ep interactions has been studiedwith the ZEUS detector at HERA for exchanged four-momentum squared 5 < Q^2 <1000 GeV^2 using an integrated luminosity of 354 pb^{-1}. The beauty and charmcontent in events with at least one jet have been extracted using the invariantmass of charged tracks associated with secondary vertices and the decay-lengthsignificance of these vertices. Differential cross sections as a function ofQ^2, Bjorken x, jet transverse energy and pseudorapidity were measured andcompared with next-to-leading-order QCD calculations. The beauty and charmcontributions to the proton structure functions were extracted from thedouble-differential cross section as a function of x and Q^2. The runningbeauty-quark mass, m_b at the scale m_b, was determined from a QCD fit atnext-to-leading order to HERA data for the first time and found to be 4.07 \pm0.14 (fit} ^{+0.01}_{-0.07} (mod.) ^{+0.05}_{-0.00} (param.) ^{+0.08}_{-0.05}(theo) GeV.

Measurement of beauty and charm production in deep inelastic scattering at HERA and measurement of the beauty-quark mass