4 research outputs found
Measurements of the Cross Sections for Open Charm and Beauty Production in gamma gamma Collisions at root(s)=189-202 GeV
The production of c and b quarks in gamma-gamma collisions is studied with
the L3 detector at LEP with 410 pb^-1 of data, collected at centre-of-mass
energies from 189 GeV to 202 GeV. Hadronic final states containing c and b
quarks are identified by detecting electrons or muons from their semileptonic
decays. The cross sections sigma(e+e- -> e+e- c c~ X) and sigma(e+e- -> e+e- b
b~ X) are measured and compared to next-to-leading order perturbative QCD
calculations. The cross section of b production is measured in gamma-gamma
collisions for the first time. It is in excess of the QCD prediction by a
factor of three