Measurement of the strange quark forward backward asymmetry around the Z0 peak

Abreu, P.;Cortina Gil, Eduardo;DELPHI Collaboration;et.al.
(2000) European Physical Journal C. Particles and Fields — Vol. 14, n° 4, p. 613-631 (2000)

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Abstract
A precise measurement of the strange quark forward-backward asymmetry used 3.2M multihadronic events around the Z0 peak collected by the DELPHI experiment from 1992 to 1995. The ring imaging Cherenkov detectors in the barrel and end-cap regions identify high energy charged kaons which tag the s quark. The s quark asymmetry was measured at dierent centre-of-mass energies; in particular at the Z0 pole A0ss = 0:1008 0:0113 (stat.) 0:0040 (syst.); (1) taking the expected d and u quark asymmetries from the Standard Model. The quark flavour fractions are assumed from the Standard Model and the fragmentation process is modelled by JETSET. From the s quark pole asymmetry the electroweak mixing angle was determined: sin2 lepteff = 0:2321 0:0029: (2) The parity violating coupling of the s quark to the Z was determined to be: As = 0:909 0:102 (stat.) 0:036(syst.): (3)
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Abreu, P., Cortina Gil, E., DELPHI Collaboration, & et al. (2000). Measurement of the strange quark forward backward asymmetry around the Z0 peak. European Physical Journal C. Particles and Fields, 14(4), 613-631. https://doi.org/10.1007/s100520000378 (Original work published 2000)