Electroweak coupling measurements from polarized Bhabha scattering at the Z{sup 0} resonance

Conference · Mon Aug 01 04:00:00 EDT 1994

DOI:https://doi.org/10.2172/10114075· OSTI ID:10109388

Pitts, K T ^[1]

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1. Univ. of Oregon, Eugene, OR (United States). Dept. of Physics

The cross section for Bhabha scattering (e{sup +}e{sup {minus}} {yields} e{sup +}e{sup {minus}}) with polarized electrons at the center of mass energy of the Z{sup 0} resonance has been measured with the SLD experiment at the SLAC Linear Collider (SLC) during the 1992 and 1993 runs. The first measurement of the left-right asymmetry in Bhabha scattering (A{sub LR}e{sup +}e{sup {minus}} ({theta})) is presented. From A{sub LR}{sup e+}e{sup {minus}}({theta}) the effective weak mixing angle is measured to be sin{sup 2}{theta}{sub W}{sup eff} = 0.2245 {+-} 0.0049 {+-} 0.0010. The effective electron vector and axial vector couplings to the Z{sup 0} are extracted from a combined analysis of the polarized Bhabha scattering data and the left-right asymmetry (A{sub LR}) previously published by this collaboration. From the combined 1992 and 1993 data the effective electron couplings are measured to be v{sub e} = {minus}0.0414 {+-} 0.0020 and a{sub e} = {minus}0.4977 {+-} 0.0045.

• Research Organization: Oregon Univ., Eugene, OR (United States). Dept. of Physics; Stanford Univ., CA (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: FG06-85ER40224; AC03-76SF00515
• OSTI ID: 10109388
• Report Number(s): SLAC-PUB--6639; CONF-940816--81; ON: DE95006056; IN: OREXP-94-3
• Country of Publication: United States
• Language: English

Related Subjects

662310
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ASYMMETRY
BHABHA SCATTERING
CROSS SECTIONS
POLARIZED BEAMS
STANFORD LINEAR COLLIDER
WEAK AND ELECTROMAGNETIC INTERACTIONS OF LEPTONS
WEINBERG ANGLE