Measurement of t polarisation at LEP L 3 Collaboration

M. Acciarri,O. Adriani,M. Aguilar-Benitez, S., Ahlen, J. Alcaraz, G. Alemanni, J. Allaby, A. Aloisio, M. G. Alviggi, G. Ambrosi, H. Anderhub, T., Angelescu, F. Anselmo, A. Arefiev, T. Azemoon, P., Bagnaia, L. Baksay, R. C. Ball, S. Banerjee, K. Banicz, P. Bartalini, A. Baschirotto, M. Basile, F. Becattini, U. Becker, J. Berdugo, P. Berges, B. L. Betev, A. Biland, J. J. Blaising, G. J. Bobbink, R. Bock, A. Bohm, L., Boldizsar, D. Bourilkov, M. Bourquin, D. Boutigny, S. Braccini, J. G. Branson, A. Buffini, A. Buijs, M. Capell,G. Cara Romeo, A. M. Cartacci, J. Casaus, G. Castellini, F. Cavallari, N. Cavallo, C. Cecchi, M. Cerrada, F. Cesaroni, M. Chamizo, U. K. Chaturvedi, S. V. Chekanov, M. Chemarin, G. M. Chen, H. S. Chen, G. Chiefari, F. Cindolo, C. Civinini, I. Clare, R. Clare, G. Coignet, A. P. Colijn, N. Colino, S. Costantini, F. Cotorobai, A. Csilling, M. T. Dova, D. Duchesneau, P. Duinker,H. El Mamouni, F. J. Eppling, P. Extermann, A. Favara, H. Fesefeldt

semanticscholar（2019）

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摘要

Using the data collected with the L3 detector at LEP between 1990 and 1995, corresponding to an integrated luminosity of 149 pb_1, the t longitudinal polarisation has been measured as a function of the production polar angle using the t decays t~TM h_w (h = p,p,ai) and T~TMfv/t (/ = e,m). From this measurement the quantities Ae and AT, which depend on the couplings of the electron and the t to the Z, are determined to be Ae = 0.1678 " 0.0127 " 0.0030 and At = 0.1476 " 0.0088 " 0.0062, consistent with the hypothesis of e-T universality. Under this assumption a value of = 0.1540 " 0.0074 " 0.0044 is obtained, yielding the value of the effective weak mixing angle sin1 2 340w = 0.2306 " 0.0011. © 1998 Elsevier Science B.V. All rights reserved. 1 Also supported by CONICET and Universidad Nacional de La Plata, CC 67, 1900 La Plata, Argentina. 2 Also supported by Panjab University, Chandigarh-160014, India. 3 Supported by Deutscher Akademischer Austauschdienst. 4 Supported by the German Bundesministerium fur Bildung, Wissenschaft, Forschung und Technologie. 5 Supported by the National Natural Science Foundation of China. 6 Supported by the Hungarian OTKA fund under contract num bers T14459, T19181 and T24011. 7 Supported also by the Comisión Interministerial de Ciencia y Technologia.

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