Measurement of the strange quark forward-backward asymmetry around the Z\(^{0}\) peak

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Abstract.

A precise measurement of the strange quark forward-backward asymmetry used 3.2M multihadronic events around the Z\(^0\) 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 different centre-of-mass energies; in particular at the Z\(^0\) pole

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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:

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The parity violating coupling of the s quark to the Z was determined to be:

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