"TITLE","AUTHORS","SUBJECT","SUBJECT_RELATED","DESCRIPTION","PUBLISHER","AVAILABILITY","RESEARCH_ORG","SPONSORING_ORG","PUBLICATION_COUNTRY","PUBLICATION_DATE","CONTRIBUTING_ORGS","LANGUAGE","RESOURCE_TYPE","TYPE_QUALIFIER","JOURNAL_ISSUE","JOURNAL_VOLUME","RELATION","COVERAGE","FORMAT","IDENTIFIER","REPORT_NUMBER","DOE_CONTRACT_NUMBER","OTHER_IDENTIFIER","DOI","RIGHTS","ENTRY_DATE","OSTI_IDENTIFIER","PURL_URL" "Determination of the structure of {tau}decays in the reaction e{sup +}e{sup -} {yields} {tau}{sup +}{tau}{sup -} {yields} {rho}{sup +} anti {nu}{sub {tau}}{rho}{sup -}{nu}{sub {tau}} and a precision measurement of the {tau}-neutrino helicity","Albrecht, H; Hamacher, T; Hofmann, R P; Kirchhoff, T; Mankel, R; Nau, A; Nowak, S; Ressing, D; Schroeder, H; Schulz, H D; Walter, M; Wurth, R; Hast, C; Kapitza, H; Kolanoski, H; Kosche, A; Lange, A; Lindner, A; Schieber, M; Siegmund, T; Spaan, B; Thurn, H; Toepfer, D; Wegener, D; Eckstein, P; Schmidtler, M; Schramm, M; Schubert, K 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; Huepper, A; Knoepfle, K T; Spengler, J; Krieger, P; MacFarlane, D B; Prentice, J D; Saull, P R.B.; Tzamariudaki, K; Water, van de R.G.; Yoon, T S; Frankl, C; 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; Tichomirov, I; Zaitsev, Yu [DESY, Hamburg (Germany)]; [Univ. Dortmund, Inst. fuer Physik (Germany)]; [Inst. fuer Kern- und Teilchenphysik, Technische Univ. Dresden (Germany)]; [Physikalisches Inst., Univ. Erlangen-Nuernberg (Germany)]; [2. Inst. fuer Experimentalphysik, Univ. Hamburg (Germany)]; [Inst. fuer Hochenergiephysik, Univ. Heidelberg (Germany)]; [Max-Planck-Inst. fuer Kernphysik, Heidelberg (Germany)]; [Inst. of Particle Physics (Canada)]; [Inst. fuer Experimentelle Kernphysik, Univ. Karlsruhe (Germany)]; [Inst. J. Stefan and Oddelek za Fiziko, Univ. Ljubljana (Slovenia)]; [Inst. of Theoretial and Experimental Physics, Mosow (Russian Federation)]; ARGUS Collaboration","72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ELECTRON-POSITRON INTERACTIONS; ANNIHILATION; TAU PARTICLES; SEMILEPTONIC DECAY; WEAK CHARGED CURRENTS; COUPLING CONSTANTS; AXIAL-VECTOR CURRENTS; HELICITY; TAU NEUTRINOS; PAIR PRODUCTION; RHO-770 MESONS; HADRONIC PARTICLE DECAY; PIONS PLUS; PIONS MINUS; PIONS NEUTRAL; CHARGED-CURRENT INTERACTIONS; GEV RANGE 01-10; GEV RANGE 10-100; ANGULAR CORRELATION; EXPERIMENTAL DATA; 662310; 662210; WEAK AND ELECTROMAGNETIC INTERACTIONS OF LEPTONS; UNIFIED THEORIES AND MODELS","","Using the ARGUS detector at the DORIS II storage ring we have investigated the Lorentz structure of the electroweak interaction in semi-hadronic {tau} decays. Spin correlations in the process e{sup +}e{sup -}{yields}{tau}{sup +}{tau}{sup -}{yields} anti {nu}{sub {tau}}{pi}{sup +}{pi}{sup 0} {nu}{sub {tau}}{pi}{sup -}{pi}{sup 0} are exploited for a measurement of the normalized product of the vector (g{sub V}) and axial vector (g{sub A}) couplings of the {tau} lepton, {gamma}{sub AV}=2 Re{l_brace}g{sub A}g{sub V}*{r_brace}/(vertical stroke g{sub V}vertical stroke {sup 2}+vertical stroke g{sub A}vertical stroke {sup 2}). The correlations are sensitive to the product of the couplings in both {tau} decays: {gamma}{sub AV}{sup 2}={gamma}{sub AV}({tau}{sup -}{yields}{nu}{sub {tau}}W{sup -}){gamma}{sub AV}({tau}{sup +}{yields} anti {nu}{sub {tau}}W{sup +}), which can be interpreted as the product of the neutrino helicities: {gamma}{sub AV}{sup 2}=-h({nu}{sub {tau}})h( anti {nu}{sub {tau}}). The measured value, {gamma}{sub AV}{sup 2}=1.044{+-}0.057{+-}0.060, determines the relative sign of the neutrino helicities. Assuming CP invariance, the absolute value {l_brace}{gamma}{sub AV}{r_brace}=1.022{+-}0.028{+-}0.030 was found to be in excellent agreement with the Standard Model. The contribution of scalar (g{sub S}) or pseudoscalar (g{sub P}) couplings was also investigated. No evidence for a scalar-like coupling was found. (orig.)","","OSTI; NTIS (US Sales Only); INIS","Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany)","","Germany","1994-07-01","","English","Technical Report","Numerical Data","","","Other Information: PBD: Jul 1994","","Medium: X; Size: 14 p.","ON: DE95725959","DESY-94-120","","Journal ID: ISSN 0418-9833; Other: ON: DE95725959; TRN: DE94FM575","https://doi.org/","","2008-02-12","10105607",""