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First measurement of the strange quark asymmetry at the z(0) peak

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First measurement of the strange quark asymmetry at the z(0) peak

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DELPHI Collaboration; Castillo Giménez, María Victoria; Ferrer Soria, Antonio; 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

Este documento está disponible también en : 10.1007/BF01564817

A measurement of the strange quark forward-backward asymmetry at the Z0 peak was performed using 718,000 multihadronic Z0 decays collected by the DELPHI detector at LEP in 1992. Thes-quark was tagged by the presence of high momentum charged kaons identified by the Ring Imaging Cherenkov detector and byΛ 0;s decaying intopπ−. Thes-quark purity obtained was estimated for the two hadrons to be 43%. The averages-quark asymmetry was found to be 0.131±0.035 (stat.) ±0.013 (syst.). The forward-backward asymmetry was measured for unresolvedd-ands-quarks, tagged by the detection of a high energy neutron or neutral kaon in the Hadron Calorimeter. The combinedd-ands-quark purity was 69% and their asymmetry was found to be 0.112±0.031 (stat.) ±0.054 (syst.).

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