DOI 10.1007/s100520000378
Measurement of the strange quark forward-backward asymmetry around the Z0 peak
The DELPHI Collaboration
P.Abreu22
22 LIP, IST, FCUL - Av. Elias Garcia, 14-1o,
1000 Lisboa Codex, Portugal
Received: 8 October 1999 / Revised version: 23 February 2000 /
Published online: 18 May 2000 - © Springer-Verlag 2000
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 different centre-of-mass
energies; in particular at the Z0 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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Copyright Società Italiana di Fisica, Springer-Verlag 2000