[SLAC] [SLAC Pubs and Reports]

SLAC-PUB-8154
A Preliminary Direct Measurement of the Parity-Violating Coupling of the Z0 to Strange Quarks, As

Abstract

We present an updated direct measurement of the parity-violating coupling of the Z0 to strange quarks, As, derived from the full SLD data sample of approximately 550,000 hadronic decays of Z0 bosons produced with a polarized electron beam and recorded by the SLD experiment at SLAC between 1993 and 1998. Z0---> s anti-s events are tagged by the presence in each event hemisphere of a high-momentum K±, Ks or Lambda capital, Greek0/anti-Lambda capital, Greek0 identified using the Cherenkov Ring Imaging Detector and/or a mass tag. The CCD vertex detector is used to suppress the background from heavy-flavor events. The strangeness of the tagged particle is used to sign the event thrust axis in the direction of the initial s quark. The coupling As is obtained directly from a measurement of the left-right-forward-backward production asymmetry in polar angle of the tagged s quark. The background from u anti-u and d anti-d events is measured from the data, as is the analyzing power of the method for s anti-s events. We measure:

As = 0.85 ± 0.06(stat.) ± 0.07(syst.)(preliminary).

Full Text

PDF

Compressed PostScript

techexplorer

Notes

The PDF version of this document was distilled from a PostScript file most likely created from LaTeX source which used Type 3 fonts. The resultant PDF may be unreadable on the screen at the default viewing magnification (fonts will appear bitmapped, jagged), though the type will be legible at higher magnifications.

Despite the cosmetic problems resulting from the use Type 3 fonts in the original source file, such PDF files print without problems; likewise, the onscreen text is searchable and selectable.

More Information

Full bibliographic data for this document, including its complete author list, is (or soon will be) available from SLAC's SPIRES-HEP Database.
Please report problems with this file to posting@slac.stanford.edu. The SLAC preprint inventory is provided by the SLAC Technical Publications Department.
Page generated 04 Apr 2001 @ 15:06 PDT by htmlme.pl