Determination of the structure of τ decays in the reaction e+e- → τ+τ- → ϱ+vτϱ-v τ and a precision measurement of the τ-neutrino helicity

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; B. Spaan; H. Thurn; D. Töpfer; D. Wegener; P. Eckstein; M. Schmidtler; M. Schramm; K. R. Schubert; R. Schwierz; R. Waldi; K. Reim; H. Wegener; R. Eckmann; H. Kuipers; O. Mai; R. Mundt; T. Oest; R. Reiner; 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; C. Frankl; M. Schneider; S. Weseler; G. Kernel; P. Križan; E. Križnič; T. Podobnik; T. Živko; V. Balagura; I. Belyaev; S. Chechelnitsky; M. Danilov; A. Droutskoy; Yu Gershtein; A. Golutvin; I. Korolko; G. Kostina; D. Litvintsev; V. Lubimov; P. Pakhlov; S. Semenov; A. Snizhko; I. Tichomirov; Yu Zaitsev

doi:10.1016/0370-2693(94)90992-X

Determination of the structure of τ decays in the reaction e+e- → τ+τ- → ϱ+vτϱ-v τ and a precision measurement of the τ-neutrino helicity

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. SiegmundB. Spaan, H. Thurn, D. Töpfer, D. Wegener, P. Eckstein, M. Schmidtler, M. Schramm, K. R. Schubert, R. Schwierz, R. Waldi, K. Reim, H. Wegener, R. Eckmann, H. Kuipers, O. Mai, R. Mundt, T. Oest, R. Reiner, 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, C. Frankl, M. Schneider, S. Weseler, G. Kernel, P. Križan, E. Križnič, T. Podobnik, T. Živko, V. Balagura, I. Belyaev, S. Chechelnitsky, M. Danilov, A. Droutskoy, Yu Gershtein, A. Golutvin, I. Korolko, G. Kostina, D. Litvintsev, V. Lubimov, P. Pakhlov, S. Semenov, A. Snizhko, I. Tichomirov, Yu Zaitsev

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

17 Scopus citations

Abstract

Using the ARGUS detector at the DORIS II storage ring we have investigated the Lorentz structure of the electroweak interaction in semi-hadronic τ decays. Spin correlations in the process e⁺e^- → τ⁺τ^- → v_τπ⁺ π⁰ v_τπ^-π⁰ are exploited for a measurement of the normalized product of the vector (g_V) and axial vector (g_A) couplings of the τ lepton, γinAV = 2 Re{g_Ag_V^*} (|g_V|²). The correlations are sensitive to the product of the couplings in both τ decays: γ_AV² = γ_AV(τ^- → ν_τW^-) _AV = -h(v_τ)h(v_τ). The measured value, γ_AV² = 1.044±0.057±0.060, determines the relative sign of the neutrino helicities. Assuming CP invariance, the absolute value |γ_AV| = 1.022±0.028±0.030 was found to be incellent agreement with the Standard Model. The contribution of scalar (g_s) or pseudoscalar (g_P) couplings was also investigated. No evidence for a scalar-like coupling was found.

Original language	English
Pages (from-to)	383-392
Number of pages	10
Journal	Physics Letters B
Volume	337
Issue number	3-4
DOIs	https://doi.org/10.1016/0370-2693(94)90992-X
State	Published - 13 Oct 1994
Externally published	Yes

Access to Document

10.1016/0370-2693(94)90992-X

Cite this

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. (1994). Determination of the structure of τ decays in the reaction e+e- → τ+τ- → ϱ+vτϱ-v τ and a precision measurement of the τ-neutrino helicity. Physics Letters B, 337(3-4), 383-392. https://doi.org/10.1016/0370-2693(94)90992-X

@article{848b30e1af544ae2b685461225fea0f1,

title = "Determination of the structure of τ decays in the reaction e+e- → τ+τ- → ϱ+vτϱ-v τ and a precision measurement of the τ-neutrino helicity",

abstract = "Using the ARGUS detector at the DORIS II storage ring we have investigated the Lorentz structure of the electroweak interaction in semi-hadronic τ decays. Spin correlations in the process e+e- → τ+τ- → vτπ+ π0 vτπ-π0 are exploited for a measurement of the normalized product of the vector (gV) and axial vector (gA) couplings of the τ lepton, γinAV = 2 Re{gAgV*} (|gV|2). The correlations are sensitive to the product of the couplings in both τ decays: γAV2 = γAV(τ- → ντW-) AV = -h(vτ)h(vτ). The measured value, γAV2 = 1.044±0.057±0.060, determines the relative sign of the neutrino helicities. Assuming CP invariance, the absolute value |γAV| = 1.022±0.028±0.030 was found to be incellent agreement with the Standard Model. The contribution of scalar (gs) or pseudoscalar (gP) couplings was also investigated. No evidence for a scalar-like coupling was found.",

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 B. Spaan and H. Thurn and D. T{\"o}pfer and D. Wegener and P. Eckstein and M. Schmidtler and M. Schramm and Schubert, {K. R.} and R. Schwierz 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 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 C. Frankl and M. Schneider and S. Weseler and G. Kernel and P. Kri{\v z}an and E. Kri{\v z}ni{\v c} and T. Podobnik and T. {\v Z}ivko and V. Balagura and I. Belyaev and S. Chechelnitsky and M. Danilov and A. Droutskoy and Yu Gershtein and A. Golutvin and I. Korolko and G. Kostina and D. Litvintsev and V. Lubimov and P. Pakhlov and S. Semenov and A. Snizhko and I. Tichomirov and Yu Zaitsev",

note = "Funding Information: l DESY, IfH Zeuthen 2 Supported by the German Bundesministerium ftir Forschung und Technologic, under contract number 054DO5 IP. 3 Supported by the German Bundesministerium far Forschung und Technologic, under contract number 056DDI 1P. 4 Supported by the German Bundesministerium ftir Forschung und Technologic, under contract number 054ER12P. 5 Supported by the German Bundesministerium ftir Forschung und Technologic, under contract number 055HD21P. 6 University of Toronto, Toronto, Ontario, Canada. 7 McGill University, Montreal, Quebec, Canada. 8 Supported by the Natural Sciences and Engineering Research Council, Canada. 9 Supported by the German Bundesministerium fiJr Forschung und Technologic, under contract number 055KAI 1P. l0 Supported by the Ministry of Science and Technology of the Republic of Slovenia and the Internationales Biiro KfA, Jiilich.",

year = "1994",

month = oct,

day = "13",

doi = "10.1016/0370-2693(94)90992-X",

language = "English",

volume = "337",

pages = "383--392",

journal = "Physics Letters B",

issn = "0370-2693",

publisher = "Elsevier B.V.",

number = "3-4",

}

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, Spaan, B, Thurn, H, Töpfer, D, Wegener, D, Eckstein, P, Schmidtler, M, Schramm, M, Schubert, KR, 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, Hüpper, A, Knöpfle, KT, Spengler, J, Krieger, P, MacFarlane, DB, Prentice, JD, Saull, PRB, Tzamariudaki, K, Van de Water, RG, Yoon, TS, Frankl, C, Schneider, M, Weseler, S, Kernel, G, Križan, P, Križnič, E, Podobnik, T, Živko, T, Balagura, V, Belyaev, I, Chechelnitsky, S, Danilov, M, Droutskoy, A, Gershtein, Y, Golutvin, A, Korolko, I, Kostina, G, Litvintsev, D, Lubimov, V, Pakhlov, P, Semenov, S, Snizhko, A, Tichomirov, I & Zaitsev, Y 1994, 'Determination of the structure of τ decays in the reaction e+e- → τ+τ- → ϱ+vτϱ-v τ and a precision measurement of the τ-neutrino helicity', Physics Letters B, vol. 337, no. 3-4, pp. 383-392. https://doi.org/10.1016/0370-2693(94)90992-X

TY - JOUR

T1 - Determination of the structure of τ decays in the reaction e+e- → τ+τ- → ϱ+vτϱ-v τ and a precision measurement of the τ-neutrino helicity

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 - Spaan, B.

AU - Thurn, H.

AU - Töpfer, D.

AU - Wegener, D.

AU - Eckstein, P.

AU - Schmidtler, M.

AU - Schramm, M.

AU - Schubert, K. R.

AU - Schwierz, R.

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 - 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 - Frankl, C.

AU - Schneider, M.

AU - Weseler, S.

AU - Kernel, G.

AU - Križan, P.

AU - Križnič, E.

AU - Podobnik, T.

AU - Živko, T.

AU - Balagura, V.

AU - Belyaev, I.

AU - Chechelnitsky, S.

AU - Danilov, M.

AU - Droutskoy, A.

AU - Gershtein, Yu

AU - Golutvin, A.

AU - Korolko, I.

AU - Kostina, G.

AU - Litvintsev, D.

AU - Lubimov, V.

AU - Pakhlov, P.

AU - Semenov, S.

AU - Snizhko, A.

AU - Tichomirov, I.

AU - Zaitsev, Yu

N1 - Funding Information: l DESY, IfH Zeuthen 2 Supported by the German Bundesministerium ftir Forschung und Technologic, under contract number 054DO5 IP. 3 Supported by the German Bundesministerium far Forschung und Technologic, under contract number 056DDI 1P. 4 Supported by the German Bundesministerium ftir Forschung und Technologic, under contract number 054ER12P. 5 Supported by the German Bundesministerium ftir Forschung und Technologic, under contract number 055HD21P. 6 University of Toronto, Toronto, Ontario, Canada. 7 McGill University, Montreal, Quebec, Canada. 8 Supported by the Natural Sciences and Engineering Research Council, Canada. 9 Supported by the German Bundesministerium fiJr Forschung und Technologic, under contract number 055KAI 1P. l0 Supported by the Ministry of Science and Technology of the Republic of Slovenia and the Internationales Biiro KfA, Jiilich.

PY - 1994/10/13

Y1 - 1994/10/13

N2 - Using the ARGUS detector at the DORIS II storage ring we have investigated the Lorentz structure of the electroweak interaction in semi-hadronic τ decays. Spin correlations in the process e+e- → τ+τ- → vτπ+ π0 vτπ-π0 are exploited for a measurement of the normalized product of the vector (gV) and axial vector (gA) couplings of the τ lepton, γinAV = 2 Re{gAgV*} (|gV|2). The correlations are sensitive to the product of the couplings in both τ decays: γAV2 = γAV(τ- → ντW-) AV = -h(vτ)h(vτ). The measured value, γAV2 = 1.044±0.057±0.060, determines the relative sign of the neutrino helicities. Assuming CP invariance, the absolute value |γAV| = 1.022±0.028±0.030 was found to be incellent agreement with the Standard Model. The contribution of scalar (gs) or pseudoscalar (gP) couplings was also investigated. No evidence for a scalar-like coupling was found.

AB - Using the ARGUS detector at the DORIS II storage ring we have investigated the Lorentz structure of the electroweak interaction in semi-hadronic τ decays. Spin correlations in the process e+e- → τ+τ- → vτπ+ π0 vτπ-π0 are exploited for a measurement of the normalized product of the vector (gV) and axial vector (gA) couplings of the τ lepton, γinAV = 2 Re{gAgV*} (|gV|2). The correlations are sensitive to the product of the couplings in both τ decays: γAV2 = γAV(τ- → ντW-) AV = -h(vτ)h(vτ). The measured value, γAV2 = 1.044±0.057±0.060, determines the relative sign of the neutrino helicities. Assuming CP invariance, the absolute value |γAV| = 1.022±0.028±0.030 was found to be incellent agreement with the Standard Model. The contribution of scalar (gs) or pseudoscalar (gP) couplings was also investigated. No evidence for a scalar-like coupling was found.

UR - http://www.scopus.com/inward/record.url?scp=0000374138&partnerID=8YFLogxK

U2 - 10.1016/0370-2693(94)90992-X

DO - 10.1016/0370-2693(94)90992-X

M3 - Article

AN - SCOPUS:0000374138

SN - 0370-2693

VL - 337

SP - 383

EP - 392

JO - Physics Letters B

JF - Physics Letters B

IS - 3-4

ER -

Determination of the structure of τ decays in the reaction e+e- → τ+τ- → ϱ+vτϱ-v τ and a precision measurement of the τ-neutrino helicity

Abstract

Access to Document

Other files and links

Fingerprint

Cite this