Speaker
Vladyslav Libov
(Deutsches Elektronen-Synchrotron (DE))
Description
The production of beauty and charm quarks in $ep$ interactions has been studied with the ZEUS detector at HERA for exchanged four-momentum squared $5 < Q^2 < 1000$ GeV$^2$ 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 $Q^2$, Bjorken-$x$, jet transverse 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 $Q^2$. The running beauty-quark mass is determined from a QCD fit at next-to-leading order to HERA data for the first time.
Author
Matthew Wing
(UCL)
