First measurement of the strange quark asymmetry at the Z0 peak

Abreu, P.;Cortina Gil, Eduardo;DELPHI Collaboration;et.al.
(1995) Zeitschrift für Physik. C, Particles and fields — Vol. 67, p. 1-14 (1995)

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A measurement of the strange quark forwardbackward asymmetry at the Z ~ peak was performed using 718,000 multihadronic Z ~ 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 A~ decaying into pro-. 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 4, 0.035 (star.) 4. 0.013 (s~ls~.). 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 4- 0.031 (star.) 4- 0.054 (syst.).
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Abreu, P., Cortina Gil, E., DELPHI Collaboration, & et al. (1995). First measurement of the strange quark asymmetry at the Z0 peak. Zeitschrift für Physik. C, Particles and fields, 67, 1-14. https://hdl.handle.net/2078.5/163923 (Original work published 1995)