Light Quark Fragmentation and a Measurement of A{sub s} at the SLD
We have studied the fragmentation process in Z{sup 0} {yields} light-flavor (u{bar u}, d{bar d}, s{bar s}) events by measuring the differential cross sections for the production of the identified hadrons {pi}{sup {+-}}, K{sup {+-}}, p/{bar p}, K{sub s}{sup 0}, {Lambda}{sup 0}/{bar {Lambda}}{sup 0}, K*{sup 0}/{bar K}*{sup 0} and {phi}, and by performing a preliminary study of correlations in rapidity between pairs of identified {pi}{sup {+-}}, K{sup {+-}}, and p/{bar p}. Short range charge correlations are observed between all combinations of these three hadron species. A strong long range correlation is observed between all combinations of these three hadron species. A strong long range correlation is observed for high-momentum charged kaon pairs, and weaker {pi}{sup +}{pi}{sup -}, {pi}{sup +}K{sup -} and pK{sup -} correlations are observed. The SLC beam polarization is used to tag the quark hemisphere in each event, allowing the first study of rapidities signed such that positive rapidity is along the quark rather than antiquark direction. Distributions of signed rapidities and of ordered differences between signed rapidities provide new insights into leading particle production and several new tests of fragmentation models. We have used these correlation studies to perform a preliminary direct measurement of the parity violating coupling of the Z{sup 0} to strange quarks, A{sub s}. Our result is: A{sub s} = 0.82 {+-} 0.10(stat.) {+-} 0.08(syst.)(preliminary).
- 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:
- 10210
- Report Number(s):
- SLAC-PUB-8133; TRN: US0401865
- Resource Relation:
- Other Information: Presented at the 34th Recontres de Moriond: QCD and High Energy Hadronic Interactions, Les Arcs (FR); 03/20/1999--03/27/1999; PBD: 19 Apr 1999
- Country of Publication:
- United States
- Language:
- English
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