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Measurement of the forward-backward asymmetry of e(+)e(-)-]z-]b(b)over-bar using prompt leptons and a lifetime tag

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Measurement of the forward-backward asymmetry of e(+)e(-)-]z-]b(b)over-bar using prompt leptons and a lifetime tag

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DELPHI Collaboration; Ferrer Soria, Antonio; Cases Ruiz, Ramón; Castillo Giménez, María Victoria; Higón Rodríguez, Emilio; Chrin, J. T. M.; Cortina Gil, Eduardo; Ferrer Soria, Antonio; Fuster Verdú, Juan A.; García García, Carmen; Gómez Cadenas, Juan José; Hernández Rey, Juan José; Hernando Morata, José Ángel; Lacasta Llácer, Carlos; Lozano Bahilo, José Julio; Martínez Vidal, Fernando; Martí García, Salvador; Navas Concha, Sergio; Salt Cairols, José; Valls Ferrer, Juan Antonio

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

The forward-backward asymmetry of the processe + e −→Z→b bb¯ has been measured using events collected by the DELPHI experiment during the 1991 and 1992 LEP runs. This data sample corresponded to 884 000 hadronicZ decays at a centre-of-mass energy s√∼MZ . The tagging of b-quark events was performed using two approaches; the first was based on the semileptonic decay channelsb→X+μ andb→X+e, the second used a lifetime tag with jet-charge reconstruction. The results of these two methods were combined to give Abb¯FB=0.107±0.011(stat.+syst.+mixing). With the semileptonic sample, the forward-backward asymmetry of the processe + e −→Z→ cc¯ was also measured to be Acc¯FB=0.083±0.022(stat.)±0.016(syst.). The effective value of the Weinberg mixing angle derived from these measurements was sin2θlepeff=0.2294±0.0021.

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