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Title: An Improved Direct Measurement of Leptonic Coupling Asymmetries with Polarized Z{sup 0}'s

Abstract

We report new direct measurements of the Z{sup 0}-lepton coupling asymmetry parameters A{sub e}, A{sub {mu}} and A{sub r}, with polarized Z{sup 0}'s collected by the SLD detector at the SLAC Linear Collider. The parameters are extracted from the measurement of the left-right-forward-backward asymmetries for each lepton species. The 1996, 1997 and 1998 SLD runs are included in this analysis and combined with published data from the 1993-95 runs. Preliminary results are A{sub e} = 0.1558 {+-} 0.0064, A{sub {mu}} = 0.137 {+-} 0.016 and A{sub {tau}} = 0.142 {+-} 0.016. If lepton universality is assumed, a combined asymmetry parameter A{sub l} = 0.1523 {+-} 0.0057 results. This translates into an effective weak mixing angle sin{sup 2} {theta}{sub W}{sup eff} = 0.23085 {+-} 0.00073 at the Z{sup 0} resonance.

Authors:
Publication Date:
Research Org.:
Stanford Linear Accelerator Center, Menlo Park, CA (US)
Sponsoring Org.:
USDOE Office of Energy Research (ER) (US)
OSTI Identifier:
10512
Report Number(s):
SLAC-PUB-8213
TRN: US0401867
DOE Contract Number:  
AC03-76SF00515
Resource Type:
Technical Report
Resource Relation:
Other Information: Paper contributed to the XIXth International Symposium on Lepton Photon Interactions, Stanford, CA (US); 08/09/1999--08/14/1999; PBD: 3 Aug 1999
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ASYMMETRY; LEPTONS; LINEAR COLLIDERS; RESONANCE; STANFORD LINEAR ACCELERATOR CENTER

Citation Formats

Abe, Toshinori. An Improved Direct Measurement of Leptonic Coupling Asymmetries with Polarized Z{sup 0}'s. United States: N. p., 1999. Web. doi:10.2172/10512.
Abe, Toshinori. An Improved Direct Measurement of Leptonic Coupling Asymmetries with Polarized Z{sup 0}'s. United States. doi:10.2172/10512.
Abe, Toshinori. Tue . "An Improved Direct Measurement of Leptonic Coupling Asymmetries with Polarized Z{sup 0}'s". United States. doi:10.2172/10512. https://www.osti.gov/servlets/purl/10512.
@article{osti_10512,
title = {An Improved Direct Measurement of Leptonic Coupling Asymmetries with Polarized Z{sup 0}'s},
author = {Abe, Toshinori},
abstractNote = {We report new direct measurements of the Z{sup 0}-lepton coupling asymmetry parameters A{sub e}, A{sub {mu}} and A{sub r}, with polarized Z{sup 0}'s collected by the SLD detector at the SLAC Linear Collider. The parameters are extracted from the measurement of the left-right-forward-backward asymmetries for each lepton species. The 1996, 1997 and 1998 SLD runs are included in this analysis and combined with published data from the 1993-95 runs. Preliminary results are A{sub e} = 0.1558 {+-} 0.0064, A{sub {mu}} = 0.137 {+-} 0.016 and A{sub {tau}} = 0.142 {+-} 0.016. If lepton universality is assumed, a combined asymmetry parameter A{sub l} = 0.1523 {+-} 0.0057 results. This translates into an effective weak mixing angle sin{sup 2} {theta}{sub W}{sup eff} = 0.23085 {+-} 0.00073 at the Z{sup 0} resonance.},
doi = {10.2172/10512},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1999},
month = {8}
}

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