Improved direct measurement of leptonic coupling asymmetries with polarized Z bosons

We present final measurements of the Z boson-lepton coupling asymmetry parameters A(e), A(mu), and A(tau) 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...

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Veröffentlicht in:	Physical review letters 2001-02, Vol.86 (7), p.1162-1166
Hauptverfasser:	Abe, K, Abe, T, Adam, I, Akimoto, H, Aston, D, Baird, K G, Baltay, C, Band, H R, Barklow, T L, Bauer, J M, Bellodi, G, Berger, R, Blaylock, G, Bogart, J R, Bower, G R, Brau, J E, Breidenbach, M, Bugg, W M, Burke, D, Burnett, T H, Burrows, P N, Calcaterra, A, Cassell, R, Chou, A, Cohn, H O, Coller, J A, Convery, M R, Cook, V, Cowan, R F, Crawford, G, Damerell, C J, Daoudi, M, de Groot, N, de Sangro, R, Dong, D N, Doser, M, Dubois, R, Erofeeva, I, Eschenburg, V, Etzion, E, Fahey, S, Falciai, D, Fernandez, J P, Flood, K, Frey, R, Hart, E L, Hasuko, K, Hertzbach, S S, Huffer, M E, Huynh, X, Iwasaki, M, Jackson, D J, Jacques, P, Jaros, J A, Jiang, Z Y, Johnson, A S, Johnson, J R, Kajikawa, R, Kalelkar, M, Kang, H J, Kofler, R R, Kroeger, R S, Langston, M, Leith, D W, Lia, V, Lin, C, Mancinelli, G, Manly, S, Mantovani, G, Markiewicz, T W, Maruyama, T, McKemey, A K, Messner, R, Moffeit, K C, Moore, T B, Morii, M, Muller, D, Murzin, V, Narita, S, Nauenberg, U, Neal, H, Nesom, G, Oishi, N, Onoprienko, D, Osborne, L S, Panvini, R S, Park, C H, Peruzzi, I, Piccolo, M, Piemontese, L, Plano, R J, Prepost, R, Prescott, C Y, Ratcliff, B N, Reidy, J, Reinertsen, P L, Rochester, L S, Rowson, P C, Russell, J J
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Sprache:	eng
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Zusammenfassung:	We present final measurements of the Z boson-lepton coupling asymmetry parameters A(e), A(mu), and A(tau) 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 A(e) = 0.1544+/-0.0060, A(mu) = 0.142+/-0.015, and A(tau) = 0.136+/-0.015. Combined with our left-right asymmetry measured from hadronic decays, we find A(e) = 0.1516+/-0.0021. Assuming lepton universality, we obtain a combined effective weak mixing angle of sin (2)theta(eff)(W) = 0.230 98+/-0.000 26.
ISSN:	0031-9007 1079-7114
DOI:	10.1103/PhysRevLett.86.1162