Unique solution for the weak neutral current coupling constants in purely leptonic interactions

• Published in: Physics letters. B 1980-01, Vol.95 (1), p.149-153
• Main Authors: Barber, D.P., Becker, U., Berghogff, G., Böhm, A., Branson, J.G., Bron, J., Buikman, D., Burger, J.D., Chang, C.C., Chen, H.S., Chen, M., Cheng, C.P., Chu, Y.S., Clare, R., Duinker, P., Fang, G.Y., Fesefeldt, H., Fong, D., Fukushima, M., Guo, J.C., Hariri, A., Herten, G., Ho, M.C., Hsu, H.K., Hsu, T.T., Kadel, R.W., Krenz, W., Li, J., Li, Q.Z., Lu, M., Luckey, D., Ma, C.M., Ma, D.A., Massaro, G.G.G., Matsuda, T., Newman, H., Pohl, M., Poschmann, F.P., Revol, J.P., Rohde, M., Rykaczewski, H., Sinram, K., Tang, H.W., Tang, L.G., Teuchert, D., Ting, Samuel C.C., Tung, K.L., Vannucci, F., Wang, X.R., Warnock, J., Wei, P.S., White, M., Wu, G.H., Wu, T.W., Xi, J.P., Yang, P.C., Yu, C.C., Yu, X.H., Zhang, N.L., Zhu, R.Y.
• Format: Article
• Language: English
• ISSN: 0370-2693; 1873-2445
• DOI: 10.1016/0370-2693(80)90420-7

By combining results from the MARK-J at PETRA on Bhabha scattering, μ +μ - and τ +τ - production with recent world data from neutrino-electron scattering experiments, we determine unique values for the leptonic weak neutral current coupling constants g V and g A in the framework of electroweak models containing a single Z 0. In contrast to previous analyses, we only use data from purely leptonic interactions, and therefore avoid the inherent uncertainties resulting from the use of hadronic targets. From the MARK-J data alone in the context of the standard SU(2) ⊗ U (1) model of Glashow, Weinberg and Salam, we find sin 2 θ W=0.24±0.11.