Determination of the Michel parameters ρ, ξ, and δ in τ-lepton decays with τ → ρν tags

H. Albrecht; T. Hamacher; R. P. Hofmann; T. Kirchhoff; R. Mankel; A. Nau; S. Nowak; D. Reßing; H. Schröder; H. D. Schulz; M. Walter; R. Wurth; C. Hast; H. Kapitza; H. Kolanoski; A. Kosche; A. Lange; A. Lindner; M. Schieber; T. Siegmund; H. Thurn; D. Töpfer; D. Wegener; C. Frankl; J. Graf; M. Schmidtler; M. Schramm; K. R. Schubert; R. Schwierz; B. Spaan; R. Waldi; K. Reim; H. Wegener; R. Eckmann; H. Kuipers; O. Mai; R. Mundt; T. Oest; R. Reiner; A. Rohde; W. Schmidt-Parzefall; J. Stiewe; S. Werner; K. Ehret; W. Hofmann; A. Hüpper; K. T. Knöpfle; J. Spengler; P. Krieger; D. B. MacFarlane; J. D. Prentice; P. R.B. Saull; K. Tzamariudaki; R. G. Van De Water; T. S. Yoon; M. Schneider; S. Weseler; M. Bračko; G. Kernel; P. Križan; E. Križnič; G. Medin; T. Podobnik; T. Zivko; V. Balagura; S. Barsuk; I. Belyaev; R. Chistov; M. Danilov; V. Eiges; L. Gershtein; Yu Gershtein; A. Golutvin; O. Igonkina; I. Korolko; G. Kostina; D. Litvintsev; P. Pakhlov; S. Semenov; A. Snizhko; I. Tichomirov; Yu Zaitsev

doi:10.1016/S0370-2693(98)00565-6

Determination of the Michel parameters ρ, ξ, and δ in τ-lepton decays with τ → ρν tags

H. Albrecht
, T. Hamacher
, R. P. Hofmann
, T. Kirchhoff
, R. Mankel
, A. Nau
, S. Nowak
, D. Reßing
, H. Schröder
, H. D. Schulz
, M. Walter
, R. Wurth
, C. Hast
, H. Kapitza
, H. Kolanoski
, A. Kosche
, A. Lange
, A. Lindner
, M. Schieber
, T. Siegmund

H. Thurn, D. Töpfer, D. Wegener, C. Frankl, J. Graf, M. Schmidtler, M. Schramm, K. R. Schubert, R. Schwierz, B. Spaan, R. Waldi, K. Reim, H. Wegener, R. Eckmann, H. Kuipers, O. Mai, R. Mundt, T. Oest, R. Reiner, A. Rohde, W. Schmidt-Parzefall, J. Stiewe, S. Werner, K. Ehret, W. Hofmann, A. Hüpper, K. T. Knöpfle, J. Spengler, P. Krieger, D. B. MacFarlane, J. D. Prentice, P. R.B. Saull, K. Tzamariudaki, R. G. Van De Water, T. S. Yoon, M. Schneider, S. Weseler, M. Bračko, G. Kernel, P. Križan, E. Križnič, G. Medin, T. Podobnik, T. Zivko, V. Balagura, S. Barsuk, I. Belyaev, R. Chistov, M. Danilov, V. Eiges, L. Gershtein, Yu Gershtein, A. Golutvin, O. Igonkina, I. Korolko, G. Kostina, D. Litvintsev, P. Pakhlov, S. Semenov, A. Snizhko, I. Tichomirov, Yu Zaitsev

Research output: Contribution to journal › Article › peer-review

Abstract

Using the ARGUS detector at the e⁺e^- storage ring DORIS II, we have measured the Michel parameters ρ, ξ, and ξδ for τ^± → l^± νν̄ decays in τ-pair events produced at center of mass energies in the region of the γ resonances. Using τ^± → ρ^±ν as spin analyzing tags, we find ρ_e = 0.68 ± 0.04 ± 0.08, ξ_e = 1.12 ± 0.20 ± 0.09, ξδ_e = 0.57 ± 0.14 ± 0.07, ρ_μ = 0.69 ± 0.06 ± 0.08, ξ_μ = 1.25 ± 0.27 ± 0.14 and ξδ_μ = 0.72 ± 0.18 ± 0.10. In addition, we report the combined ARGUS results on ρ, ξ, and ξδ using this work und previous measurements.

Original language	English
Pages (from-to)	179-187
Number of pages	9
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	431
Issue number	1-2
DOIs	https://doi.org/10.1016/S0370-2693(98)00565-6
Publication status	Published - 9 Jul 1998
Externally published	Yes

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10.1016/S0370-2693(98)00565-6

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Albrecht, H., Hamacher, T., Hofmann, R. P., Kirchhoff, T., Mankel, R., Nau, A., Nowak, S., Reßing, D., Schröder, H., Schulz, H. D., Walter, M., Wurth, R., Hast, C., Kapitza, H., Kolanoski, H., Kosche, A., Lange, A., Lindner, A., Schieber, M., ... Zaitsev, Y. (1998). Determination of the Michel parameters ρ, ξ, and δ in τ-lepton decays with τ → ρν tags. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 431(1-2), 179-187. https://doi.org/10.1016/S0370-2693(98)00565-6

@article{4161f6f7ef924c1eaa36b2c26b40bfe1,

title = "Determination of the Michel parameters ρ, ξ, and δ in τ-lepton decays with τ → ρν tags",

abstract = "Using the ARGUS detector at the e+e- storage ring DORIS II, we have measured the Michel parameters ρ, ξ, and ξδ for τ± → l± ν{\=ν} decays in τ-pair events produced at center of mass energies in the region of the γ resonances. Using τ± → ρ±ν as spin analyzing tags, we find ρe = 0.68 ± 0.04 ± 0.08, ξe = 1.12 ± 0.20 ± 0.09, ξδe = 0.57 ± 0.14 ± 0.07, ρμ = 0.69 ± 0.06 ± 0.08, ξμ = 1.25 ± 0.27 ± 0.14 and ξδμ = 0.72 ± 0.18 ± 0.10. In addition, we report the combined ARGUS results on ρ, ξ, and ξδ using this work und previous measurements.",

author = "H. Albrecht and T. Hamacher and Hofmann, \{R. P.\} and T. Kirchhoff and R. Mankel and A. Nau and S. Nowak and D. Re{\ss}ing and H. Schr{\"o}der and Schulz, \{H. D.\} and M. Walter and R. Wurth and C. Hast and H. Kapitza and H. Kolanoski and A. Kosche and A. Lange and A. Lindner and M. Schieber and T. Siegmund and H. Thurn and D. T{\"o}pfer and D. Wegener and C. Frankl and J. Graf and M. Schmidtler and M. Schramm and Schubert, \{K. R.\} and R. Schwierz and B. Spaan and R. Waldi and K. Reim and H. Wegener and R. Eckmann and H. Kuipers and O. Mai and R. Mundt and T. Oest and R. Reiner and A. Rohde and W. Schmidt-Parzefall and J. Stiewe and S. Werner and K. Ehret and W. Hofmann and A. H{\"u}pper and Kn{\"o}pfle, \{K. T.\} and J. Spengler and P. Krieger and MacFarlane, \{D. B.\} and Prentice, \{J. D.\} and Saull, \{P. R.B.\} and K. Tzamariudaki and \{Van De Water\}, \{R. G.\} and Yoon, \{T. S.\} and M. Schneider and S. Weseler and M. Bra{\v c}ko and G. Kernel and P. Kri{\v z}an and E. Kri{\v z}ni{\v c} and G. Medin and T. Podobnik and T. Zivko and V. Balagura and S. Barsuk and I. Belyaev and R. Chistov and M. Danilov and V. Eiges and L. Gershtein and Yu Gershtein and A. Golutvin and O. Igonkina and I. Korolko and G. Kostina and D. Litvintsev and P. Pakhlov and S. Semenov and A. Snizhko and I. Tichomirov and Yu Zaitsev",

year = "1998",

month = jul,

day = "9",

doi = "10.1016/S0370-2693(98)00565-6",

language = "English",

volume = "431",

pages = "179--187",

journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",

issn = "0370-2693",

number = "1-2",

}

Albrecht, H, Hamacher, T, Hofmann, RP, Kirchhoff, T, Mankel, R, Nau, A, Nowak, S, Reßing, D, Schröder, H, Schulz, HD, Walter, M, Wurth, R, Hast, C, Kapitza, H, Kolanoski, H, Kosche, A, Lange, A, Lindner, A, Schieber, M, Siegmund, T, Thurn, H, Töpfer, D, Wegener, D, Frankl, C, Graf, J, Schmidtler, M, Schramm, M, Schubert, KR, Schwierz, R, Spaan, B, Waldi, R, Reim, K, Wegener, H, Eckmann, R, Kuipers, H, Mai, O, Mundt, R, Oest, T, Reiner, R, Rohde, A, Schmidt-Parzefall, W, Stiewe, J, Werner, S, Ehret, K, Hofmann, W, Hüpper, A, Knöpfle, KT, Spengler, J, Krieger, P, MacFarlane, DB, Prentice, JD, Saull, PRB, Tzamariudaki, K, Van De Water, RG, Yoon, TS, Schneider, M, Weseler, S, Bračko, M, Kernel, G, Križan, P, Križnič, E, Medin, G, Podobnik, T, Zivko, T, Balagura, V, Barsuk, S, Belyaev, I, Chistov, R, Danilov, M, Eiges, V, Gershtein, L, Gershtein, Y, Golutvin, A, Igonkina, O, Korolko, I, Kostina, G, Litvintsev, D, Pakhlov, P, Semenov, S, Snizhko, A, Tichomirov, I & Zaitsev, Y 1998, 'Determination of the Michel parameters ρ, ξ, and δ in τ-lepton decays with τ → ρν tags', Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, vol. 431, no. 1-2, pp. 179-187. https://doi.org/10.1016/S0370-2693(98)00565-6

TY - JOUR

T1 - Determination of the Michel parameters ρ, ξ, and δ in τ-lepton decays with τ → ρν tags

AU - Albrecht, H.

AU - Hamacher, T.

AU - Hofmann, R. P.

AU - Kirchhoff, T.

AU - Mankel, R.

AU - Nau, A.

AU - Nowak, S.

AU - Reßing, D.

AU - Schröder, H.

AU - Schulz, H. D.

AU - Walter, M.

AU - Wurth, R.

AU - Hast, C.

AU - Kapitza, H.

AU - Kolanoski, H.

AU - Kosche, A.

AU - Lange, A.

AU - Lindner, A.

AU - Schieber, M.

AU - Siegmund, T.

AU - Thurn, H.

AU - Töpfer, D.

AU - Wegener, D.

AU - Frankl, C.

AU - Graf, J.

AU - Schmidtler, M.

AU - Schramm, M.

AU - Schubert, K. R.

AU - Schwierz, R.

AU - Spaan, B.

AU - Waldi, R.

AU - Reim, K.

AU - Wegener, H.

AU - Eckmann, R.

AU - Kuipers, H.

AU - Mai, O.

AU - Mundt, R.

AU - Oest, T.

AU - Reiner, R.

AU - Rohde, A.

AU - Schmidt-Parzefall, W.

AU - Stiewe, J.

AU - Werner, S.

AU - Ehret, K.

AU - Hofmann, W.

AU - Hüpper, A.

AU - Knöpfle, K. T.

AU - Spengler, J.

AU - Krieger, P.

AU - MacFarlane, D. B.

AU - Prentice, J. D.

AU - Saull, P. R.B.

AU - Tzamariudaki, K.

AU - Van De Water, R. G.

AU - Yoon, T. S.

AU - Schneider, M.

AU - Weseler, S.

AU - Bračko, M.

AU - Kernel, G.

AU - Križan, P.

AU - Križnič, E.

AU - Medin, G.

AU - Podobnik, T.

AU - Zivko, T.

AU - Balagura, V.

AU - Barsuk, S.

AU - Belyaev, I.

AU - Chistov, R.

AU - Danilov, M.

AU - Eiges, V.

AU - Gershtein, L.

AU - Gershtein, Yu

AU - Golutvin, A.

AU - Igonkina, O.

AU - Korolko, I.

AU - Kostina, G.

AU - Litvintsev, D.

AU - Pakhlov, P.

AU - Semenov, S.

AU - Snizhko, A.

AU - Tichomirov, I.

AU - Zaitsev, Yu

PY - 1998/7/9

Y1 - 1998/7/9

N2 - Using the ARGUS detector at the e+e- storage ring DORIS II, we have measured the Michel parameters ρ, ξ, and ξδ for τ± → l± νν̄ decays in τ-pair events produced at center of mass energies in the region of the γ resonances. Using τ± → ρ±ν as spin analyzing tags, we find ρe = 0.68 ± 0.04 ± 0.08, ξe = 1.12 ± 0.20 ± 0.09, ξδe = 0.57 ± 0.14 ± 0.07, ρμ = 0.69 ± 0.06 ± 0.08, ξμ = 1.25 ± 0.27 ± 0.14 and ξδμ = 0.72 ± 0.18 ± 0.10. In addition, we report the combined ARGUS results on ρ, ξ, and ξδ using this work und previous measurements.

AB - Using the ARGUS detector at the e+e- storage ring DORIS II, we have measured the Michel parameters ρ, ξ, and ξδ for τ± → l± νν̄ decays in τ-pair events produced at center of mass energies in the region of the γ resonances. Using τ± → ρ±ν as spin analyzing tags, we find ρe = 0.68 ± 0.04 ± 0.08, ξe = 1.12 ± 0.20 ± 0.09, ξδe = 0.57 ± 0.14 ± 0.07, ρμ = 0.69 ± 0.06 ± 0.08, ξμ = 1.25 ± 0.27 ± 0.14 and ξδμ = 0.72 ± 0.18 ± 0.10. In addition, we report the combined ARGUS results on ρ, ξ, and ξδ using this work und previous measurements.

UR - https://www.scopus.com/pages/publications/0041360120

U2 - 10.1016/S0370-2693(98)00565-6

DO - 10.1016/S0370-2693(98)00565-6

M3 - Article

AN - SCOPUS:0041360120

SN - 0370-2693

VL - 431

SP - 179

EP - 187

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

IS - 1-2

ER -

Determination of the Michel parameters ρ, ξ, and δ in τ-lepton decays with τ → ρν tags

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