Light Quark Fragmentation in Polarized Z{sup 0} Decays at SLD
The authors report results on two physics topics from the SLD experiment at the SLAC Linear Collider, using the full sample of 550,000 events of the type e{sup +}e{sub {minus}} --> Z{sup 0} -->q anti-q. The electron beam was polarized, enabled the quark and antiquark hemispheres to be tagged in each event. One physics topics topic is the first study of rapidities signed such that positive rapidity is along the quark rather than antiquark direction. Distributions of ordered in signed rapidity between pairs of particles are analyzed, providing the first direct observation of baryon number ordering along the q anti-q axis. The other topic is the first direct measurement of A{sub s}, the parity-violating coupling of the Z{sup 0} to strange quarks, by measuring the left-right forward-backward production asymmetry in polar angle of the tagged s quark. They obtain A{sub s} = 0.895 {+-} 0.066(stat.) {+-} 0.062(syst.), which is consistent with the Standard Model and is currently the most precise measurement of this quantity.
- Research Organization:
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Sponsoring Organization:
- USDOE Office of Energy Research (ER) (US)
- DOE Contract Number:
- AC03-76SF00515
- OSTI ID:
- 763844
- Report Number(s):
- SLAC-PUB-8553; TRN: US0004877
- Resource Relation:
- Other Information: PBD: 11 Aug 2000
- Country of Publication:
- United States
- Language:
- English
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