Using data collected with the L3 detector near the Z resonance, corresponding to an integrated luminosity of 150 pb-l, the branching fractions of the tau lepton into electron and muon are measured to be beta(tau --> e<(<nu>)over bar>(e)nu (tau)) = (17.806 +/- 0.104 (stat.) +/- 0.076 (syst.))%, beta(tau --> mu<(<nu>)over bar>(mu)nu (tau)) = ( 17.342 +/- 0.110 (stat.) +/- 0.067 (syst.))%. From these results the ratio of the charged current coupling constants of the muon and the electron is determined to be g(mu)/g(e) = 1.0007 +/- 0.0051. Assuming electron-muon universality, the Fermi constant is measured in tau lepton decays as G(F) = (1.1616 +/- 0.0058) x 10(-5) GeV(-2). Furthermore, the coupling constant of the strong interaction at the tau mass scale is obtained as alpha (s)(m(tau)(2)) = 0.322 +/- 0.009 (exp.) +/- 0.015 (theory), (C) 2001 Elsevier Science B,V. All rights reserved.

Measurement of the tau branching fractions into leptons / M. Acciarri, P. Achard, O. Adriani, M. Aguilar-Benitez, J. Alcaraz, G. Alemanni, J. Allaby, A. Aloisio, M. G. Alviggi, G. Ambrosi, H. Anderhub, V. P. Andreev, T. Angelescu, F. Anselmo, A. Arefiev, T. Azemoon, T. Aziz, P. Bagnaia, A. Bajo, L. Baksay, et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - ELETTRONICO. - 507:(2001), pp. 47-60. [10.1016/S0370-2693(01)00294-5]

Measurement of the tau branching fractions into leptons

ADRIANI, OSCAR;BECATTINI, FRANCESCO;D'ALESSANDRO, RAFFAELLO;
2001

Abstract

Using data collected with the L3 detector near the Z resonance, corresponding to an integrated luminosity of 150 pb-l, the branching fractions of the tau lepton into electron and muon are measured to be beta(tau --> e<()over bar>(e)nu (tau)) = (17.806 +/- 0.104 (stat.) +/- 0.076 (syst.))%, beta(tau --> mu<()over bar>(mu)nu (tau)) = ( 17.342 +/- 0.110 (stat.) +/- 0.067 (syst.))%. From these results the ratio of the charged current coupling constants of the muon and the electron is determined to be g(mu)/g(e) = 1.0007 +/- 0.0051. Assuming electron-muon universality, the Fermi constant is measured in tau lepton decays as G(F) = (1.1616 +/- 0.0058) x 10(-5) GeV(-2). Furthermore, the coupling constant of the strong interaction at the tau mass scale is obtained as alpha (s)(m(tau)(2)) = 0.322 +/- 0.009 (exp.) +/- 0.015 (theory), (C) 2001 Elsevier Science B,V. All rights reserved.
2001
507
47
60
M. Acciarri;P. Achard;O. Adriani;M. Aguilar-Benitez;J. Alcaraz;G. Alemanni;J. Allaby;A. Aloisio;M. G. Alviggi;G. Ambrosi;H. Anderhub;V. P. ...espandi
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in FLORE sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificatore per citare o creare un link a questa risorsa: https://hdl.handle.net/2158/774963
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 11
  • ???jsp.display-item.citation.isi??? 14
social impact