+muon+electron+4neutrino%22&type=SU">tau+ tau- --> muon electron 4neutrino, S035.1, S035RHE, electron positron [annihilation], tau: pair production, leptonic decay: tau, tau [pair production], correlation: (muon electron), Michel parameter, momentum: correlation, S035RHM, electron positron: colliding beams, S035XI, tau [electroproduction], pair production [tau], colliding beams: electron positron, tau: electroproduction, tau: leptonic decay, colliding beams [electron positron], tau [leptonic decay], experimental results
| Popis: |
9 pp. (1993).
Using the ARGUS detector at the e+e− storage ring DORIS II, we have determined the Michel parameters ϱ and ξ of τ → μννandτ → eνν decays. From a data sample with 333 events/pb around s= 10GeV, we select 3230 events ǂe+e−→ τ+τ−→ (μ±μμ)(eǂvv) and determine ϱ from the e and μ momentum spectra and ξ from the correlations between e and μ momenta. For ϱ we obtain ϱτ→e = 0.79 ± 0.08 ± 0.06 and ϱτ→μ = 0.76 ± 0.08 in accordance with the V - A structure of the decays. The momentum correlations are only sensitive to the product ξτ→eξτ→μ. Setting ξτ→e = ξτ→μ, we obtain |ξτ| = 0.90 ± 0.15 ± 0.10 also in accordance with V - A. The updated decay fractions are B(τ →evv) = (17.5 ± 0.3 ± 0.5)% and B(τ → μvv) = (17.4 ± 0.3 ± 0.5)%. |
| Jazyk: |
English |
| DOI: |
10.3204/pubdb-2023-00414 |
| DOI: |
10.3204/PUBDB-2023-00414 |
| Přístupová URL adresa: |
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::70ea3ab490e24b27d6d1c7ff2301c3fb |
| Rights: |
OPEN |
| Přírůstkové číslo: |
edsair.doi.dedup.....70ea3ab490e24b27d6d1c7ff2301c3fb |
-->
| Autor: |
Albrecht, H., Ehrlichmann, H., Wurth, R., Hast, C., Kolanoski, H., Kosche, A., Lange, A., Lindner, A., Mankel, R., Schieber, M., Siegmund, T., Spaan, B., Hamacher, T., Thurn, H., Töpfer, D., Wegener, D., Bittner, M., Eckstein, P., Paulini, M., Reim, K., Wegener, H., Eckmann, R., Mundt, R., Hofmann, R. P., Oest, T., Reiner, R., Schmidt-Parzefall, W., Funk, W., Stiewe, J., Werner, S., Ehret, K., Hofmann, W., Hüpper, A., Khan, S., Kirchhoff, A., Knöpfle, K. T., Seeger, M., Spengler, J., Britton, D. I., Charlesworth, C. E. K., Edwards, K. W., Hyatt, E. R. F., Kapitza, H., Krieger, P., MacFarlane, D. B., Nau, A., Patel, P. M., Prentice, J. D., Saull, P. R. B., Tzamariudaki, K., Van de Water, R. G., Yoon, T.-S., Reβing, D., Schmidtler, M., Schneider, M., Schubert, K. R., Nowak, S., Strahl, K., Waldi, R., Weseler, S., Kernel, G., Križan, P., Križnič, E., Podobnik, T., Živko, T., Balagura, V., Belyaev, I., Schröder, H., Chechelnitsky, S., Danilov, M., Droutskoy, A., Gershtein, Yu., Golutvin, A., Kostina, G., Litvintsev, D., Lubimov, V., Pakhlov, P., Ratnikov, F., Schulz, H. D., Semenov, S., Snizhko, A., Soloshenko, V., Tichomirov, I., Zaitsev, Yu., ARGUS Collaboration, Walter, M. |
| Jazyk: |
angličtina |
| Rok vydání: |
1993 |
| Předmět: |
|
| DOI: |
10.3204/pubdb-2023-00414 |
| Popis: |
9 pp. (1993).
Using the ARGUS detector at the e+e− storage ring DORIS II, we have determined the Michel parameters ϱ and ξ of τ → μννandτ → eνν decays. From a data sample with 333 events/pb around s= 10GeV, we select 3230 events ǂe+e−→ τ+τ−→ (μ±μμ)(eǂvv) and determine ϱ from the e and μ momentum spectra and ξ from the correlations between e and μ momenta. For ϱ we obtain ϱτ→e = 0.79 ± 0.08 ± 0.06 and ϱτ→μ = 0.76 ± 0.08 in accordance with the V - A structure of the decays. The momentum correlations are only sensitive to the product ξτ→eξτ→μ. Setting ξτ→e = ξτ→μ, we obtain |ξτ| = 0.90 ± 0.15 ± 0.10 also in accordance with V - A. The updated decay fractions are B(τ →evv) = (17.5 ± 0.3 ± 0.5)% and B(τ → μvv) = (17.4 ± 0.3 ± 0.5)%. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
|
