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The production of charm and beauty quarks in ep interactions has beenmeasured with the ZEUS detector at HERA for squared four-momentum exchangeQ^2>20 GeV^2, using an integrated luminosity of 126 pb^{-1}. Charm and beautyquarks were identified through their decays into muons. Differential crosssections were measured for muon transverse momenta p_T^{\mu}>1.5 GeV andpseudorapidities -1.6<\eta^{\mu}<2.3, as a function of p_T^{\mu}, \eta^{\mu},Q^2 and Bjorken x. The charm and beauty contributions to the proton structurefunction F_2 were also extracted. The results agree with previous measurementsbased on independent techniques and are well described by QCD predictions.

Measurement of charm and beauty production in deep inelastic ep scattering from decays into muons at HERA