A measurement of electron-tau universality from decays of intermediate vector bosons at the CERN $\bar pp$ collider

J. Alitti,G. Ambrosini,R. Ansari,D. Autiero,P. Bareyre,I. A. Bertram,G. Blaylock,P. Bonamy,M. Bourliaud,K. Borer,M. Bourliaud, D. Buskulic, G. Carboni, D. Cavalli, V. Cavasinni,P. Cenci,J. C. Chollet, C. Conta,G. Costa,F. Costantini,L. Cozzi,A. Cravero, M. Curatolo, A. Dell'Acqua,T. DelPrete,R. S. DeWolf,L. DiLella,Y. Ducros, G. F. Egan, K. F. Einsweiler,B. Esposito,L. Fayard,A. Federspiel,R. Ferrari, M. Fraternali, D. Froidevaux,G. Fumagalli,J. M. Gaillard, F. Gianotti,O. Gildemeister,C. Gössling,V. G. Goggi,S. Grünendahl, K. Hara,S. Hellman, J. Hrivnac,H. Hufnagel,E. Hugentobler, K. Hultqvist,E. Iacopini, J. Incandela, K. Jakobs,P. Jenni,E. E. Kluge,N. Kurz,S. Lami, P. Lariccia, M. Lefebvre,L. Linssen, M. Livan,P. Lubrano,C. Magneville, L. Mandelli, L. Mapelli, M. Mazzanti,K. Meier,B. Merkel,J. P. Meyer,M. Moniez,R. Moning,M. Morganti,L. Müller,D. J. Munday, M. Nessi, F. Nessi-Tedaldi,C. Onions,T. Pal,M. A. Parker,G. Parrour,F. Pastore,E. Pennacchio,J. M. Pentney,M. Pepe,L. Perini, C. Petridou,P. Petroff,H. Plothow-Besch, G. Polesello, A. Poppleton,K. Pretzl,M. Primavera,M. Punturo,J. P. Repellin, A. Rimoldi,M. Sacchi, P. Scampoli,J. Schacher, V. Simak,S. L. Singh,V. Sondermann, S. Stapnes,A. V. Stirling,C. Talamonti,F. Tondini,S. N. Tovey,E. Tsesmelis, G. Unal,M. Valdata-Nappi, V. Vercesi,A. R. Weidberg, P. S. Wells,T. O. White,D. R. Wood,S. A. Wotton,H. Zaccone,A. Zylberstejn

msra（1991）

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摘要

The ratio of branching fractions of theW decaying to τ ande leptons is measured using $\bar pp$ collisions at $\sqrt s = 630$ GeV. The ratio of the electroweak charged current couplings to theW is then determined to begτW/geW=0.997±0.056 (stat.)±0.042 (syst.). The decay modeZ→τ+→τ+ is observed and also found to be consistent withe-τ universality.

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A measurement of electron-tau universality from decays of intermediate vector bosons at the CERN collider

A measurement of electron-tau universality from decays of intermediate vector bosons at the CERN $\bar pp$ collider