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

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

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Abstract: The production of beauty and charm quarks in ep interactions has been studied with the ZEUS detector at HERA for exchanged four-momentum squared 5 < Q2< 1000 GeV2 using an integrated luminosity of 354 pb−1. The beauty and charm content in events with at least one jet have bee...

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Bibliographic Details
Main Authors: The, L, Abramowicz, H, Abt, I, Adamczyk, L, Adamus, M, Aggarwal, R, Antonelli, S, Arslan, O, Aushev, V, Aushev, Y, Bachynska, O, Barakbaev, A, Bartosik, N, Behnke, O, Behr, J, Behrens, U, Bertolin, A, Bhadra, S, Bloch, I, Bokhonov, V, Boos, E, Borras, K, Brock, I, Brugnera, R, Bruni, A
Format: Journal article
Language:English
Published: Springer-Verlag Italia s.r.l. 2014
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Summary:Abstract: The production of beauty and charm quarks in ep interactions has been studied with the ZEUS detector at HERA for exchanged four-momentum squared 5 < Q2< 1000 GeV2 using an integrated luminosity of 354 pb−1. The beauty and charm content in events with at least one jet have been 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 Q2, Bjorken x, jet trans- verse energy and pseudorapidity were measured and compared with next-to-leading-order QCD calculations. The beauty and charm contributions to the proton structure functions were extracted from the double-differential cross section as a function of x and Q2. The running beauty-quark mass, mb at the scale mb, was determined from a QCD fit at next-to-leading order to HERA data for the first time and found to be mb(mb) = 4.07 ± 0.14 (fit)− 0.07+ 0.01(mod.)− 0.00+ 0.05(param.)− 0.05+ 0.08(theo.) GeV.

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