Measurement of the ratio B(W)/B(We) in pp- collisions at s =1.8 TeV

Fumio Abe, D. Amidei,Giorgio Apollinari,M. Atac, P. Auchincloss, A. Baden,Nicola Bacchetta,M. W. Bailey, A. Bamberger,P. de Barbaro,B. A. Barnett, A. Barbaro-Galtieri,Virgil E Barnes,T. Baumann, Franco Bedeschi, S. Behrends,Stefano Belforte, Giovanni Bellettini,J. N. Bellinger, D. P. Benjamin, J. R. Bensinger,Andrew Beretvas,J. P. Berge,S. Bertolucci,Sanchita Bhadra,M. Binkley,R. E. Blair,Craig Blocker, Kenneth Bloom,V. Bolognesi,A. W. Booth,C. Boswell,G. W. Brandenburg, D. N. Brown, E. Buckley-Geer,H. S. Budd,G. Busetto, A. Byon-Wagner,K. L. Byrum,Claudio Campagnari,Mark Campbell,A. Caner, R. Carey, W. Carithers,Duncan Carlsmith,J. T. Carroll,R. J. Cashmore, A. Castro, F. Cervelli, K. Chadwick,Giorgio Chiarelli,William Chinowsky, S. Cihangir,A. G. Clark,D. Connor,M. Contreras,J. Cooper,M. Cordelli, D. Crane,Maria Curatolo, C. T. Day,F. DeJongh,S. Dell'Agnello, Mauro Dell'Orso,L. Demortier,Bruce Denby,P. F. Derwent,T. Devlin, D. Dibitonto,M. Dickson,R. B. Drucker,Kevin Einsweiler, A. Etchegoyen, J. E. Elias,Robert P. Ely,Sarah Catherine Eno, S. Errede,Bellisario Esposito, B. Flaugher, G. W. Foster, M. Franklin, J. C. Freeman,Henry J. Frisch, T. Fuess,Yasuo Fukui,Alan Garfinkel, A. Gauthier,S. Geer, D. W. Gerdes,Paola Giannetti, N. Giokaris, P. Giromini,Larry D. Gladney, M. Gold, K. Goulianos, H. Grassmann, C. Grosso-Pilcher, C. Haber,S. R. Hahn, R. Handler

Physical Review Letters（1992）

Cited 10|Views55

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Abstract

We have observed over 10{sup 2} events of the type {ital W}{r arrow}{tau}{nu} followed by {tau}{r arrow} hadrons, where the taus are identified by their decay into one or three charged particles. We measure the cross section times branching ratio for {ital p{bar p}}{r arrow}{ital W}{r arrow}{tau}{nu} and compare it to the value for {ital W}{r arrow}{ital e}{nu} to directly measure the ratio of weak coupling constants {ital g}{sub {tau}}/{ital g}{sub {ital e}}. We find {ital g}{sub {tau}}/{ital g}{sub {ital e}}=0.97{plus minus}0.07, consistent with lepton universality.

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Key words

coupling constant,standard model,charged particles,cross section,elementary particles,monte carlo method

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