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Improved Direct Measurement of Leptonic Coupling Asymmetries with Polarized Z Bosons

2001; American Physical Society; Volume: 86; Issue: 7 Linguagem: Inglês

10.1103/physrevlett.86.1162

1092-0145

K. Abe, K. Abe, K. Abe, И. Адам, H. Akimoto, D. Aston, K. Baird, C Baltay, H. R. Band, T. Barklow, J. M. Bauer, G. Bellodi, Robert Berger, G. Blaylock, J. R. Bogart, G. R. Bower, J. Brau, M. Breidenbach, W. Bugg, D. L. Burke, T. H. Burnett, Philip Burrows, A. Calcaterra, R. Cassell, A. Chou, H.O. Cohn, J. A. Coller, M. R. Convery, V. Cook, R. F. Cowan, G. Crawford, Chris Damerell, M. Daoudi, N. De Groot, R. de Sangro, D. Dong, M. Doser, R. D. DuBois, I. Erofeeva, V. Eschenburg, E. Etzion, S. Fahey, D. Falciai, J. P. Fernández, K. T. Flood, R. Frey, E. L. Hart, K. Hasuko, S. S. Hertzbach, M.E. Huffer, X. Huynh, M. Iwasaki, D. J. Jackson, P. Jacques, J. A. Jaros, Zuozhen Jiang, A. S. Johnson, J. R. Johnson, R. Kajikawa, M Kalelkar, Hongji Kang, R. Kofler, R. Kroeger, M. Langston, D. W. G. S. Leith, V. Lia, C. Lin, G. Mancinelli, S. Manly, G. Mantovani, T W Markiewicz, T. Maruyama, A. K. McKemey, R. Messner, K. C. Moffeit, T. B. Moore, M. Morii, D.R. Muller, V. Murzin, S. Narita, U. Nauenberg, H. Neal, G. Nesom, N. Oishi, D. Onoprienko, L.S. Osborne, R. S. Panvini, C H Park, I. M. Peruzzi, M. Piccolo, L. Piemontese, R J Plano, R. Prepost, C. Y. Prescott, B. N. Ratcliff, J. Reidy, P. L. Reinertsen, L S Rochester, P. C. Rowson, J J Russell, O. H. Saxton, T. Schalk, B. A. Schumm, J. Schwiening, Victor Serbo, Gary Shapiro, N. B. Sinev, J. Snyder, H. Staengle, A. Stahl, P. Stamer, H. Steiner, D. Su, F. Suekane, A. Sugiyama, S. Suzuki, M. Swartz, F. Ë. Taylor, J. Thom, E. Torrence, T. Usher, J. Va’vra, R. Verdier, D.L. Wagner, A. P. Waite, S. Walston, A. W. Weidemann, Eric R. Weiss, J. S. Whitaker, S. Williams, S. Willocq, R. J. Wilson, W. J. Wisniewski, J. L. Wittlin, M. Woods, T R Wright, R. K. Yamamoto, J. Yashima, S. Yellin, C. C. Young, H. Yuta,

Neutrino Physics Research

We present final measurements of the Z boson-lepton coupling asymmetry parameters Ae, Aμ, and Aτ with the complete sample of polarized Z bosons collected by the SLD detector at the SLAC Linear Collider. From the left-right production and decay polar angle asymmetries in leptonic Z decays we measure Ae=0.1544±0.0060, Aμ=0.142±0.015, and Aτ=0.136±0.015. Combined with our left-right asymmetry measured from hadronic decays, we find Ae=0.1516±0.0021. Assuming lepton universality, we obtain a combined effective weak mixing angle of sin2θeffW=0.23098±0.00026.Received 6 October 2000DOI:https://doi.org/10.1103/PhysRevLett.86.1162©2001 American Physical Society