Speaker
Prof.
Uri Karshon
(Weizmann Institute)
Description
The copious production of charm quarks at HERA has yielded a detailed understanding
of QCD dynamics, the only measure of the charm contribution to the proton structure,
as well as measurements of the charm mass and the fragmentation parameters of charmed
hadrons. Although with smaller samples, measurements of beauty production also place
constraints on the structure of the proton and allow a measurement of the beauty
quark mass. Several measurements of heavy quark production using different decay
modes, are presented, both new individual measurements from the H1 and ZEUS collaborations,
as well as combined data. These provide a powerful vindication of the form of the gluon
density in the proton derived from scaling violations of inclusive deep inelastic
scattering data. QCD fits to the data lead to measurements of the charm and beauty
masses and also provide precise predictions for e.g. W and Z production at the LHC.
Additionally, fragmentation fractions to the ground state charm hadrons are compared
to e+e- data and previous HERA results. The data have a precision similar to that of
the e+e- data and support the hypothesis that fragmentation is independent of the
production process.
Primary author
Prof.
Uri Karshon
(Weizmann Institute)
