Beauty-Mesons
For the first time, the production cross section for B-mesons, these
are particles with a heavy beauty-quark, was measured in lepton-proton
collisions. Semi- leptonic decays of the B-mesons were analysed: beauty
-> charm muon neutrino. The main observable is the transverse momentum
of the muon relative to the beauty-quark jet: owing to its large mass,
the charm quark direction of flight reflects the direction of the beauty-quark.
In contrast, the muon can be found at large angles relative to the direction
of the beauty quark.
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