A measurement of the strange quark forward-backward asymmetry at the Z(0) peak was performed using 718,000 multihadronic Z(0) decays collected by the DELPHI detector at LEP in 1992. The s-quark was tagged by the presence of high momentum charged kaons identified by the Ring Imaging Cherenkov detector and by Lambda(0)'s decaying into p pi(-). The s-quark purity obtained was estimated for the two hadrons to be 43%. The average s-quark asymmetry was found to be 0.131 +/- 0.035 (stat.) +/- 0.013 (syst.). The forward-backward asymmetry was measured for unresolved d- and s-quarks, tagged by the detection of a high energy neutron or neutral kaon in the Hadron Calorimeter. The combined d- and s-quark purity was 69% and their asymmetry was found to be 0.112 +/- 0.031 (stat.) +/- 0.054 (syst.).

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

CACCIA, MASSIMO;PREST, MICHELA;
1995-01-01

Abstract

A measurement of the strange quark forward-backward asymmetry at the Z(0) peak was performed using 718,000 multihadronic Z(0) decays collected by the DELPHI detector at LEP in 1992. The s-quark was tagged by the presence of high momentum charged kaons identified by the Ring Imaging Cherenkov detector and by Lambda(0)'s decaying into p pi(-). The s-quark purity obtained was estimated for the two hadrons to be 43%. The average s-quark asymmetry was found to be 0.131 +/- 0.035 (stat.) +/- 0.013 (syst.). The forward-backward asymmetry was measured for unresolved d- and s-quarks, tagged by the detection of a high energy neutron or neutral kaon in the Hadron Calorimeter. The combined d- and s-quark purity was 69% and their asymmetry was found to be 0.112 +/- 0.031 (stat.) +/- 0.054 (syst.).
1995
DELPHI; asymmetry; Z0 resonance; s-quark
Abreu, P; Adam, W; Adye, T; Agasi, E; Ajinenko, I; Aleksan, R; Alekseev, Gd; Allport, Pp; Almehed, S; Almeida, Fml; Alvsvaag, Sj; Amaldi, U; Amato, S;...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11383/1791217
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