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2 results on '"tau- [semileptonic decay]"'

1. Tau decays into K* mesons

Author

Albrecht, H., Hamacher, T., Hofmann, R. P., Kirchhoff, T., Mankel, R., Nau, A., Nowak, S., Schroder, H., Schulz, H. D., Walter, M., Wurth, R., Hast, C., Kapitza, H., Kolanoski, H., Kosche, A., Lange, Arnd, Lindner, A., Schieber, M., Siegmund, T., Spaan, B., Thurn, H., Topfer, D., Wegener, D., Eckstein, P., Schubert, Klaus R., Schwierz, R., Waldi, R., Reim, K., Wegener, H., Eckmann, R., Kuipers, H., Mai, O., Mundt, R., Oest, T., Reiner, R., Schmidt-Parzefall, W., Stiewe, J., Werner, S., Ehret, K., Hofmann, W., Hupper, A., Knopfle, K. T., Spengler, J., Krieger, P., MacFarlane, D. B., Prentice, J. D., Saull, P. R. B., Tzamariudaki, K., van de Water, Richard George, Yoon, T. S., Frankl, C., Ressing, D., Schmidtler, M., Schneider, M., Weseler, S., Kernel, G., Krizan, P., Kriznic, E., Podobnik, T., Zivko, T., Balagura, V., Belyaev, I., Chechelnitsky, S., Danilov, M., Droutskoy, A., Gershtein, Yu., Golutvin, A., Korolko, I., Kostina, G., Litvintsev, D., Lubimov, V., Pakhlov, P., Semenov, S., Snizhko, A., Tikhomirov, I., Zaitsev, Yu., and ARGUS Collaboration

Subjects
S035.23, annihilation: electron positron, electroproduction: tau, ARGUS, DESY DORIS Stor, +K*%28892%29+K-+neutrino%2Ftau%22">tau- --> K*(892) K- neutrino/tau, semileptonic decay: tau, annihilation [electron positron], electron positron: annihilation, +K*%28892%29+neutrino%2Ftau+anything0%22">tau- --> K*(892) neutrino/tau anything0, tau- [semileptonic decay], electroproduction [tau], S035.205, pair production: tau, S035.207, S035.206, ddc:530, electron positron [colliding beams], tau-: semileptonic decay, electron positron [annihilation], tau: pair production, tau [pair production], K*(892), +K*%28892%29+pi-+neutrino%2Ftau%22">tau- --> K*(892) pi- neutrino/tau, electron positron: colliding beams, branching ratio [tau-], tau [electroproduction], 9.4-10.6 GeV-cms, pair production [tau], colliding beams: electron positron, tau: electroproduction, colliding beams [electron positron], semileptonic decay [tau-], tau-: branching ratio, experimental results
Abstract

9 pp. (1995)., Using the ARGUS detector at the storage ring DORIS II we have measured τ decays into three charged mesons containingK* mesons. Exploiting the good particle identification capabilities of the detector we have determined the following branching ratios:\(Br\left( {\tau ^ -\to \overline {K^{*0} } \pi ^ -v_\tau} \right) = \left( {0.25 \pm 0.10 \pm 0.05} \right)\% \),Br(τ−→K*0K−vτ)= (0.20±0.05±0.04)%, andBr(τ−→K*−X0vτ) =(1.15±0.15−0.18+0.13)%.

Published
1995
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2. Analysis of the decay $\tau^- \to \pi^-\pi^- \pi^+v_\tau$ and determination of thea 1(1260) resonance parameters

Author

Albrecht, H., Ehrlichmann, H., Wurth, R., Appuhn, R. D., Hast, C., Kolanoski, H., Lange, A., Lindner, A., Mankel, R., Schieber, M., Siegmund, T., Spaan, B., Hamacher, T., Thurn, H., Töpfer, D., Walther, A., Wegener, D., Bittner, M., Eckstein, P., Paulini, M., Reim, K., Wegener, H., Mundt, R., Hofmann, R. P., Oest, T., Reimer, R., Schmidt-Parzefall, W., Funk, W., Stiewe, J., Werner, S., Ehret, K., Hofmann, W., Hüpper, A., Khan, S., Kirchhoff, T., Knöpfle, K. T., Spengler, J., Britton, D. I., Charlesworth, C. E. K., Edwards, K. W., Hyatt, E. R. F., Kapitza, H., Krieger, P., MacFarlane, D. B., Patel, P. M., Nau, A., Prentice, J. D., Saull, P. R. B., Tzamariudaki, K., Water, R. G., Yoon, T. -S., Reßing, D., Schmidtler, M., Schneider, M., Schubert, K. R., Strahl, K., Nowak, S., Waldi, R., Weseler, S., Kernel, G., Križan, P., Križnič, E., Podobnik, T., Živko, T., Balagura, V., Belyaev, I., Chechelnitsky, S., Schröder, H., Danilov, M., Droutskoy, A., Gershtein, Yu., Golutvin, A., Gorelov, I., Kostina, G., Lubimov, V., Pakhlov, P., Ratnikov, F., Semenov, S., Schulz, H. D., Shibaev, V., Soloshenko, V., Tichomirov, I., Zaitsev, Yu., ARGUS Collaboration, and Walter, M.

Subjects
annihilation: electron positron, electroproduction: tau, ARGUS, Dalitz plot, semileptonic decay: tau, annihilation [electron positron], M010DS, tau- [semileptonic decay], mass spectrum: ((n)pi), a1(1260): width, a1(1260) [hadronic decay], electroproduction [tau], +pi%2B+2pi-+neutrino%2Ftau%22">tau- --> pi+ 2pi- neutrino/tau, mass [a1(1260)], electron positron [colliding beams], +rho%28770%290+pi%22">a1(1260) --> rho(770)0 pi, decay: asymmetry, a1(1260): mass, a1(1260) [mass], tau: pair production, hadronic decay: a1(1260), tau [pair production], electron positron: colliding beams, asymmetry: decay, tau [electroproduction], 9.4-10.6 GeV-cms, +a1%281260%29+neutrino%2Ftau%22">tau- --> a1(1260) neutrino/tau, pair production [tau], asymmetry [decay], width [a1(1260)], colliding beams [electron positron], a1(1260): hadronic decay, semileptonic decay [tau-], tau-: branching ratio, M010M, DESY DORIS Stor, partial wave, S035XA1, mass: a1(1260), electron positron: annihilation, M010W, ((n)pi): mass spectrum, parity: violation, S035XAL, pair production: tau, ddc:530, decay [asymmetry], parity [violation], tau-: semileptonic decay, electron positron [annihilation], violation: parity, hadronic decay [a1(1260)], branching ratio [tau-], ((n)pi) [mass spectrum], mass spectrum [((n)pi)], colliding beams: electron positron, tau: electroproduction, violation [parity], experimental results
Abstract

22 pp. (1993)., Using the ARGUS detector at the DORIS II $e^+e^−$ storage ring we have studied the three-pion hadronic final state in the decay $τ^- → π^-π^-π^+v_τ$. From about 7500 events we conclude that the three-pion system is dominated by the $J^P=1^+$ resonancea1 (1260) decaying preferentially via $ρ^0π^-$. Our data restrict a possible ρπ contribution of three-pion states without intermediate resonances to less than 6% at 95% CL. Fitting a model by Isgur et al. to the data yieldsma1=(1.211±0.007±0.0500.0)GeV/c$^2$ and $Γ$a1=(0.446±0.0021±0.1400.0)GeV/c$^2$. The second errors reflect the model dependence of the result. This is the currently most significant determination of thea1 resonance parameters. The ratio ofS- and D-wave amplitudes for the ρ0π- intermediate state of thea1− decay at the nominala1− mass was found to beD/S=−0.11±0.02. Using thisD/S ratio we update our former measurement of the parity violating asymmetry parameterγ $AV=2gAgV/(g^2_A+g^2_V)$ to 1.25±0.23±0.080.15. The branching ratio of the decay $τ^- → π^-π^-π^+v_τ$ is determined to be Br($τ^- → π^-π^-π^+v_τ$)=(6.8±0.1±0.5)%.

Published
1993
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