Details

Autor(en) / Beteiligte

• Braunschweig, W.
• Martyn, H.-U.
• Sander, H. G.
• Schmitz, D.
• Sturm, W.
• Wallraff, W.
• Cords, D.
• Felst, R.
• Fries, R.
• Gadermann, E.
• Hultschig, H.
• Joos, P.
• Koch, W.
• Kotz, U.
• Krehbiel, H.
• Kreinick, D.
• Lynch, H. L.
• McNeely, W. A.
• Mikenberg, G.
• Moffeit, K. C.
• Notz, Dieter
• Rusch, R.
• Schliwa, M.
• Wiik, B. H.
• Wolf, G.
• Grindhammer, Guenter
• Ludwig, J.
• Mess, K. H.
• Petersen, A.
• Poelz, G.
• Ringel, J.
• Romer, O.
• Sauerberg, K.
• Brandelik, R.
• Schmueser, Peter
• De Boer, W.
• Buschhorn, G.
• Fues, W.
• Von Gagern, C.
• Gunderson, B.
• Kotthaus, R.
• Lierl, H.
• Oberlack, H.
• Orito, S.
• Suda, T.
• Totsuka, Y.
• Yamada, S.

Titel

Measurements of $\tau$ decay modes and a precise determination of the mass

Ort / Verlag

Deutsches Elektronen-Synchrotron, DESY, Hamburg

Erscheinungsjahr

1977

Quelle

Elsevier Journal Backfiles on ScienceDirect (DFG Nationallizenzen)

Beschreibungen/Notizen

• The cross sections for e + e − → e + ( μ + + non showering track + any photons have been measured for cm energies between 3.1 GeV and 5.2 GeV. We observe τ -pair production below the thresholdfor charm production and determine the τ mass to be 1.807 ± 0.020 GeV from a fit to the energy dependence of the cross section. The ration of the leptonic branching ratios B μ / B e = 0.92 ± 0.32 is consistent with eμ-universality. The following branching ratios are determined for a V-A coupling: B(τ → ν τ e ν ) = B(τ → ν τ μ ν ) = 0.182 + 0.028 . B ( τ → ν τ + charged hadron + any photons) = 0.29 ± 0.11, B ( τ → ν τ + three or more charged hadrons + any photons) = 0.35 ± 0.11.