Measurement of the Z{sup 0}-lepton coupling asymmetries A{sub l}

Conference · Mon Jul 22 00:00:00 EDT 1996

OSTI ID:491563

Abe, K ^[1]; Abe, K ^[2]; Abt, I ^[3]

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1. Nagoya Univ. (Japan)
2. Tohoku Univ., Sendai (Japan)
3. Univ. of Illinois, Urbana, IL (United States); and others

The authors present direct measurements of the Z{sup 0}-lepton coupling asymmetries, A{sub e}, A{sub {mu}}, and A{sub {tau}}. It is based on a data sample selected from 170 k Z{sup 0} decays collected by the SLD detector. The Z`s are produced by collisions of polarized e{sup {minus}} with unpolarized e{sup +} bunches at SLC. The couplings are extracted from the measurement of the left-right forward-backward asymmetry for each lepton species. The preliminary results (using information from all leptonic data for A{sub e}) are: A{sub e} = 0.148 {+-} 0.016, A{sub {mu}} = 0.102 {+-} 0.033 and A{sub {tau}} = 0.190 {+-} 0.034.

• Research Organization: Stanford Univ., CA (United States); Boston Univ., MA (United States); California Institute of Technology (CalTech), Pasadena, CA (United States); California Univ., Santa Barbara, CA (United States); California Univ., Santa Cruz, CA (United States); Colorado State Univ., Fort Collins, CO (United States); Colorado Univ., Boulder, CO (United States); Univ. of Illinois at Urbana-Champaign, IL (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Massachusetts Univ., Amherst, MA (United States); Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); Oregon Univ., Eugene, OR (United States); Univ. of Wisconsin, Madison, WI (United States); Yale Univ., New Haven, CT (United States)
• Sponsoring Organization: USDOE Office of Energy Research, Washington, DC (United States); National Science Foundation, Washington, DC (United States); Istituto Nazionale di Fisica Nucleare, Rome (Italy); Japan-US Cooperative Research Project on High Energy Physics, Nagoya (Japan)
• DOE Contract Number: AC03-76SF00515; FG02-91ER40676; FG03-92ER40701; FG03-91ER40618; FG03-92ER40689; FG03-93ER40788; FG02-91ER40672; FG02-91ER40677; AC03-76SF00098; FG02-92ER40715; AC02-76ER03069; FG06-85ER40224; AC02-76ER00881; FG02-92ER40704
• OSTI ID: 491563
• Report Number(s): SLAC-PUB-7234; CONF-960765-61; ON: DE97007667; 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: 97:012461
• Resource Relation: Conference: 28. international conference on high-energy physics, Warsaw (Poland), 25-31 Jul 1996; Other Information: PBD: 22 Jul 1996
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
Z NEUTRAL BOSONS
LEPTONIC DECAY
PARTICLE PRODUCTION
ASYMMETRY
P INVARIANCE
COUPLING
ELECTRON-POSITRON INTERACTIONS
MUONS
TAU PARTICLES