Final Results on Electroweak Asymmetries from SLD
Author(s) -
Achim W. Weidemann
Publication year - 2000
Language(s) - English
Resource type - Reports
DOI - 10.2172/784757
Subject(s) - physics , lepton , particle physics , electroweak interaction , boson , asymmetry , hadron , higgs boson , collider detector at fermilab , nuclear physics , weinberg angle , electron–positron annihilation , particle decay , standard model (mathematical formulation) , large hadron collider , tevatron , electron , archaeology , gauge (firearms) , history
I present the final measurements of the Z boson-lepton coupling asymmetry parameters A{sub e}, A{sub {mu}}, and A{sub {tau}}, obtained from the complete sample of polarized Z bosons collected by the SLD detector at the SLAC Linear Collider. The measurements use leptonic Z decays and the results are A{sub e} = 0.1544 {+-} 0.0060, A{sub {mu}} = 0.142 {+-} 0.015, and A{sub {tau}} = 0.136 {+-} 0.015. The A{sub e} result is combined with the left-right asymmetry using Z decays to hadrons, A{sub LR}{sup 0} (''' A{sub e}), and is found to be A{sub e} = 0.1516 {+-} 0.0021. Assuming lepton universality, a combined effective weak mixing angle of sin{sup 2} {theta}{sub W}{sup eff} = 0.23098 {+-} 0.00026 is obtained. Using additional Standard-Model parameters an upper limit on the Higgs mass is given.
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