Preliminary measurement of leading particle effects in hadronic Z{sup 0} decays
We present preliminary evidence for leading particle production in hadronic decays of the Z{sup 0} to light quark pairs using 150,000 events recorded in the SLD experiment at SLAC. The highly polarized electron beam produced by the SLC is used to tag quark and antiquark jets, and a signed impact parameter technique is employed to reject heavy flavor events. Charged hadrons are identified in the SLD Cherenkov Ring Imaging Detector (CRID) and {Lambda}/{bar {Lambda}} are reconstructed using their charged decay modes. In a high purity sample of quark jets, the baryon momentum spectrum is harder that that of the antibaryon, and conversely for a sample of antiquark jets, supporting the hypothesis that the faster particles in jets are more likely to carry the primary quark or antiquark from the Z{sup 0} decay. Similarly, more high momentum K{sup -} that K{sup +} are observed in quark jets and conversely for antiquark jets, consistent with the hypothesis that leading K{sup {+-}} are produced predominantly in s{bar s} events rather than {ital u}{bar {ital u}} events.
- Research Organization:
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States); National Science Foundation, Washington, DC (United States); Science and Engineering Research Council, Swindon (United Kingdom); Istituto Nazionale di Fisica Nucleare, Rome (Italy); Japan-US Cooperative Research Project on High Energy Physics, Nagoya (Japan)
- DOE Contract Number:
- FG02-91ER40676; FG03-91ER40618; FG03-92ER40689; FG03-93ER40788; FG02-91ER40672; FG02-91ER40677; AC03-76SF00098; FG02-92ER40715; AC02-76ER03069; FG06-85ER40224; AC03-76SF00515; FG05-91ER40627; FG02-95ER40896; FG02-92ER40704
- OSTI ID:
- 282094
- Report Number(s):
- SLAC-PUB-7197; CONF-960765-11; ON: DE96014139; CNN: Grant PHY-91-13428; Grant PHY-89-21320; Grant PHY-92-04239; Grant PHY-88-17930; Grant PHY-88-19316; Grant PHY-92-03212; TRN: 96:020953
- Resource Relation:
- Conference: 28. international conference on high-energy physics, Warsaw (Poland), 25-31 Jul 1996; Other Information: PBD: Jun 1996
- Country of Publication:
- United States
- Language:
- English
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