Neutral current couplings of leptons to polarized Z{sup O}`s in the SLD experiment
- Vanderbilt Univ., Nashville, TN (United States)
The authors study neutral current couplings of leptons to polarized Z{sup 0}`s in the SLD experiment in terms of the leptonic asymmetry parameters A{sub e}, A{sub {mu}}, and A{sub {tau}}. The authors discuss in detail e{sub L,R}{sup {minus}} + e{sup +} {yields} Z{sup 0} {yields} {mu}{sup {minus}}{mu}{sup +} and {tau}{sup {minus}}{tau}{sup +}, with left (L)- or right (R)-handed polarized electron beams. SLD`s most precise measurement of A{sub e} is shown to result from the left-right cross section asymmetry; A{sub LR}; where the dependence on initial state electronic couplings enable use of essentially all of the data. Comparing A{sub {mu}} and A{sub {tau}} with A{sub e} tests the universality of leptonic couplings. A{sub {mu}} = 0.102 {+-} 0.033 {+-} 0.001, A{sub {tau}} = 0.190 {+-} 0.034 {+-} 0.001, and A{sub e} = 0.148 {+-} 0.016 {+-} 0.002 from these two leptonic channels. If lepton universality is assumed, a combined asymmetry parameter A{sub e{mu}{tau}} = 0.147 {+-} 0.013 results, which directly corresponds to an effective value of the weak mixing angle sin{sup 2}{theta}{sub W}{sup eff} = 0.2315 {+-} 0.0017.
- Research Organization:
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Sponsoring Organization:
- USDOE Office of Energy Research, Washington, DC (United States); National Science Foundation, Washington, DC (United States); United Kingdom Particle Physics and Astronomy Research Council (United Kingdom); Istituto Nazionale di Fisica Nucleare, Rome (Italy); Japan-US Cooperative Research Project on High Energy Physics, Nagoya (Japan); Vanderbilt Univ., Nashville, TN (United States)
- DOE Contract Number:
- FG02-91ER40676; FG03-92ER40701; FG03-91ER40618; FG03-92ER40689; FG03-93ER40788; FG02-91ER40672; FG02-91ER40677; AC03-76SF00098; FG02-92ER40715; AC02-76ER03069; FG06-85ER40224; FG02-92ER40704; AC03-76SF00515; FG02-95ER40896; FG05-91ER40627
- OSTI ID:
- 491377
- Report Number(s):
- SLAC-PUB-7375; CONF-9609164-2; ON: DE97006492; 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: 97:012569
- Resource Relation:
- Conference: 4. international workshop on tau-lepton physics, Estes Park, CO (United States), 16-19 Sep 1996; Other Information: PBD: Dec 1996
- Country of Publication:
- United States
- Language:
- English
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