First measurement of the left-right cross section asymmetry in [ital Z] boson production by [ital e][sup +][ital e][sup [minus]] collisions

• Published in: Physical review letters 1993-04, Vol.70:17
• Main Authors: Abe, K., Abt, I., Acton, P.D., Adolphsen, C.E., Agnew, G., Alber, C., Alzofon, D.F., Antilogus, P., Arroyo, C., Ash, W.W., Ashford, V., Astbury, A., Aston, D., Au, Y., Axen, D.A., Bacchetta, N., Baird, K.G., Baker, W., Baltay, C., Band, H.R., Baranko, G., Bardon, O., Barrera, F., Battiston, R., Bazarko, A.O., Bean, A., Beer, G., Belcinski, R.J., Bell, R.A., Ben-David, R., Benvenuti, A.C., Berger, R., Berridge, S.C., Bethke, S., Biasini, M., Bienz, T., Bilei, G.M., Bird, F., Bisello, D., Blaylock, G., Blumberg, R., Bogart, J.R., Bolton, T., Bougerolle, S., Bower, G.R., Boyce, R.F., Brau, J.E., Breidenbach, M., Browder, T.E., Bugg, W.M., Burgess, B., Burke, D., Burnett, T.H., Burrows, P.N., Busza, W., Byers, B.L., Calcaterra, A., Davis, R., Flynn, J., Fox, J.D., Junk, T., Kunz, P.F., Rowson, P.C., Russell, J.J., Swartz, M., SLD Collaboration
• Format: Article
• Language: English
• Subjects: 662210 > Specific Theories & Interaction Models; 662440 > Properties of Other Particles Including Hypothetical Particles-- (1992-); ACCELERATOR FACILITIES; ACCELERATORS; ASYMMETRY; BEAMS; BOSONS; CABIBBO ANGLE; CROSS SECTIONS; ELECTRON-POSITRON INTERACTIONS; ELEMENTARY PARTICLES; ENERGY RANGE; GEV RANGE; GEV RANGE 10-100; INTERACTIONS; INTERMEDIATE BOSONS; INTERMEDIATE VECTOR BOSONS; LEPTON-LEPTON INTERACTIONS; LINEAR ACCELERATORS; MATHEMATICAL MODELS; MIXING RATIO; PARTICLE INTERACTIONS; PARTICLE MODELS; PARTICLE PRODUCTION; Particle Systematics > Unified Theories & Models > (1992-); PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; POLARIZATION; POLARIZED BEAMS; STANDARD MODEL; STANFORD LINEAR COLLIDER; STANFORD LINEAR COLLIDER DETECTOR; TOTAL CROSS SECTIONS; UNIFIED GAUGE MODELS 662310 > Weak & Electromagnetic Interactions of Leptons-- (1992-); Z NEUTRAL BOSONS
• ISSN: 0031-9007; 1079-7114
• DOI: 10.1103/PhysRevLett.70.2515

We present the first measurement of the left-right cross section asymmetry ([ital A][sub [ital L][ital R]]) for [ital Z] boson production by [ital e][sup +][ital e][sup [minus]] collisions. The measurement was performed at a center-of-mass energy of 91.55 GeV with the SLD detector at the SLAC Linear Collider which utilized a longitudinally polarized electron beam. The average beam polarization was (22.4[plus minus]0.6)%. Using a sample of 10 224 [ital Z] decays, we measure [ital A][sub [ital L][ital R]] to be 0.100[plus minus]0.044(stat)[plus minus]0.004(syst), which determines the effective weak mixing angle to be sin[sup 2][theta][sub [ital W]][sup [ital e][ital f][ital f]]=0.2378 [plus minus]0.0056(stat)[plus minus]0.0005(syst).