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New methods of evaluation of the flavour composition in annihilation by double hemisphere tagging at LEP/SLC energies

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New methods of evaluation of the flavour composition in annihilation by double hemisphere tagging at LEP/SLC energies

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Billoir, P.; Vaissiere, Ch. de la; Castillo Giménez, María Victoria; Cortina Gil, Eduardo; Higón Rodríguez, Emilio; Martínez Vidal, Fernando; Salt Cairols, José

Aquest document és un/a article, creat/da en: 1995

Este documento está disponible también en : 10.1016/0168-9002(95)00115-8

Two new methods are proposed to extract the flavour contents of the events produced at LEP/SLC, together with the classification matrix of a tagging by hemispheres. By utilising the tagging obtained in both hemispheres, the efficiencies, backgrounds and flavour compositions are directly obtained by fitting the data. A minimal dependence on modelling and a consistent treatment of systematic errors are achieved by applying these methods. The choice of the tagging algorithm is irrelevant in the methods, provided that similar efficiencies are reached. As an example, a multivariate analysis technique combining the tracking information given by a microvertex detector has been applied to extract the Z → b overlineb branching ratio using a standard simulation of a LEP/SLC experiment.

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