Abstract
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.)
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;
[1]
ARGUS Collaboration
- DESY, Hamburg (Germany)
Citation Formats
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, and ARGUS Collaboration.
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.
Germany: N. p.,
1994.
Web.
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, & ARGUS Collaboration.
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.
Germany.
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, and ARGUS Collaboration.
1994.
"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."
Germany.
@misc{etde_10105607,
title = {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}
author = {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, and ARGUS Collaboration}
abstractNote = {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.)}
place = {Germany}
year = {1994}
month = {Jul}
}
title = {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}
author = {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, and ARGUS Collaboration}
abstractNote = {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.)}
place = {Germany}
year = {1994}
month = {Jul}
}