The cross section for open-beauty production in photon–photon collisions is measured using the whole high-energy and high-luminosity data sample collected by the L3 detector at LEP. This corresponds to 627 pb−1 of integrated luminosity for electron–positron centre-of-mass energies from 189 to 209 GeV. Events containing b quarks are identified through their semi- leptonic decay into electrons or muons. The e+e− → e+e−bbX cross section is measured within our fiducial volume and then ̄ extrapolated to the full phase space. These results are found to be in significant excess with respect to Monte Carlo predictions and next-to-leading order QCD calculations.
Información general
Fecha de publicación:8 de junio de 2005
Idioma del documento:Inglés
Revista:Physics Letters B; vol. 619, no. 1-2
Institución de origen:Facultad de Ciencias Exactas
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