1. Measurements of $\tau$ decay modes and a precise determination of the mass
- Author
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Braunschweig, W., Martyn, H.-U., Hultschig, H., Joos, P., Koch, W., Kotz, U., Krehbiel, H., Kreinick, D., Lynch, H. L., McNeely, W. A., Mikenberg, G., Moffeit, K. C., Sander, H. G., Notz, Dieter, Rusch, R., Schliwa, M., Wiik, B. H., Wolf, G., Grindhammer, Guenter, Ludwig, J., Mess, K. H., Petersen, A., Poelz, G., Schmitz, D., Ringel, J., Romer, O., Sauerberg, K., Brandelik, R., Schmueser, Peter, de Boer, W., Buschhorn, G., Fues, W., von Gagern, C., Gunderson, B., Sturm, W., Kotthaus, R., Lierl, H., Oberlack, H., Orito, S., Suda, T., Totsuka, Y., Yamada, S., DASP Collaboration, Wallraff, W., Cords, D., Felst, R., Fries, R., and Gadermann, E.
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+CHARGED+HADRON+NEUTRINO%2FTAU%2F+%28N%29PHOTON%22">TAU --> CHARGED HADRON NEUTRINO/TAU/ (N)PHOTON ,ELECTRON [FINAL STATE] ,FINAL STATE: MUON ,ELECTRON MUON: UNIVERSALITY ,+MUON+NEUTRINO%2FTAU%2F+ANTINEUTRINO%2FMU%22">TAU --> MUON NEUTRINO/TAU/ ANTINEUTRINO/MU ,TAU [ELECTROPRODUCTION] ,DIFFERENTIAL CROSS SECTION: ENERGY DEPENDENCE ,FINAL STATE [PHOTON] ,FINAL STATE [ANTINEUTRINO/E/] ,FINAL STATE [MUON] ,FINAL STATE: NEUTRINO/TAU ,ANTINEUTRINO/E/ [FINAL STATE] ,MUON [FINAL STATE] ,TAU: PAIR PRODUCTION ,TAU: BRANCHING RATIO ,TAU: MASS ,MUON: FINAL STATE ,FINAL STATE [ELECTRON] ,WEAK INTERACTION: CURRENT ,ELECTRON POSITRON: INCLUSIVE REACTION ,PAIR PRODUCTION: TAU ,COLLIDING BEAMS [ELECTRON POSITRON] ,ANNIHILATION: ELECTRON POSITRON ,PAIR PRODUCTION [TAU] ,NEUTRINO/TAU/ [FINAL STATE] ,FINAL STATE: ELECTRON ,+ELECTRON+NEUTRINO%2FTAU%2F+ANTINEUTRINO%2FE%22">TAU --> ELECTRON NEUTRINO/TAU/ ANTINEUTRINO/E ,ELECTRON POSITRON: COLLIDING BEAMS ,ELECTRON POSITRON [ANNIHILATION] ,ANNIHILATION [ELECTRON POSITRON] ,FINAL STATE [NEUTRINO/TAU/] ,3.1-5.2 GEV-CM ,BRANCHING RATIO [TAU] ,MAGNETIC SPECTROMETER: DASP ,+%28N%29CHARGED+HADRON+NEUTRINO%2FTAU%2F+%28N%29PHOTON%22">TAU --> (N)CHARGED HADRON NEUTRINO/TAU/ (N)PHOTON ,ANTINEUTRINO/MU/: FINAL STATE ,FINAL STATE [ANTINEUTRINO/MU/] ,PHOTON [FINAL STATE] ,TAU: ELECTROPRODUCTION ,FINAL STATE: ANTINEUTRINO/E ,TAU [PAIR PRODUCTION] ,MASS [TAU] ,PHOTON: FINAL STATE ,NEUTRINO/TAU/: FINAL STATE ,ANTINEUTRINO/MU/ [FINAL STATE] ,ANTINEUTRINO/E/: FINAL STATE ,ELECTROPRODUCTION: TAU ,ddc:530 ,TAU [DECAY MODES] ,FINAL STATE: ANTINEUTRINO/MU ,COLLIDING BEAMS: ELECTRON POSITRON ,ELECTROPRODUCTION [TAU] ,EXPERIMENTAL RESULTS ,ELECTRON: FINAL STATE ,FINAL STATE: PHOTON ,DESY DORIS STOR ,DASP [MAGNETIC SPECTROMETER] ,TAU [MASS] ,UNIVERSALITY [ELECTRON MUON] ,CURRENT [WEAK INTERACTION] ,DECAY MODES [TAU] ,ELECTRON POSITRON [COLLIDING BEAMS] ,INCLUSIVE REACTION [ELECTRON POSITRON] ,ENERGY DEPENDENCE [DIFFERENTIAL CROSS SECTION] ,MASS: TAU ,DECAY MODES: TAU ,TAU: DECAY MODES ,ELECTRON POSITRON: ANNIHILATION - Abstract
(1978). doi:10.1016/0370-2693(78)90183-1, 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.
- Published
- 1977
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