Branching ratios and spectral functions of tau decays: final ALEPH measurements and physics implications

S. Schael; R. Barate; R. Brunelière; I. de Bonis; D. Decamp; C. Goy; S. Jézéquel; J.P. Lees; F. Martin; E. Merle; M.N. Minard; B. Pietrzyk; B. Trocmé; S. Bravo; M.P. Casado; M. Chmeissani; J.M. Crespo; E. Fernandez; M. Fernandez-Bosman; Ll. Garrido; M. Martinez; A. Pacheco; H. Ruiz; A. Colaleo; D. Creanza; N. de Filippis; M. de Palma; G. Iaselli; G. Maggi; M. Maggi; S. Nuzzo; A. Ranieri; G. Raso; F. Ruggieri; G. Selvaggi; L. Silvestris; P. Tempesta; A. Tricomi; G. Zito; X. Huang; Jiali Lin; Q. Ouyang; T. Wang; Y. Xie; R. Xu; S. Xue; L. Zhang; W. Zhao; D. Abbaneo; T. Barklow; O. Buchmüller; M. Cattaneo; B. Clerbaux; H. Drevermann; R.W. Forty; M. Frank; F. Gianotti; J.B. Hansen; J. Harvey; D.E. Hutchcroft; P. Janot; B. Jost; M. Kado; P. Mato; A. Moutoussi; F. Ranjard; L. Rolandi; D. Schlatter; F. Teubert; A. Valassi; I. Videau; F. Badaud; S. Dessagne; Alain Falvard; D. Fayolle; Pascal Gay; J. Jousset; B. Michel; S. Monteil; D. Pallin; J M. Pascolo; Pascal Perret; J.D. Hansen; J.R. Hansen; P.H. Hansen; A.C. Kraan; B.S. Nilsson; A. Kyriakis; C. Markou; E. Simopoulou; A. Vayaki; K. Zachariadou; A. Blondel; J.-C. Brient; F. Machefert; A. Rougé; H. Videau; V. Ciulli; E. Focardi; G. Parrini; A. Antonelli; M. Antonelli; G. Bencivenni; F. Bossi; G. Capon; F. Cerutti; V. Chiarella; P. Laurelli; G. Mannocchi; G.P. Murtas; L. Passalacqua; J. Kennedy; J.G. Lynch; P. Negus; V. O'Shea; A.S. Thompson; S. Wasserbaech; R. Cavanaugh; S. Dhamotharan; C. Geweniger; P. Hanke; V. Hepp; E.E. Kluge; A. Putzer; H. Stenzel; K. Tittel; M. Wunsch; R. Beuselinck; W. Cameron; G. Davies; P.J. Dornan; M. Girone; J. Nowell; S.A. Rutherford; J.K. Sedgbeer; J.C. Thompson; R. White; V.M. Ghete; P. Girtler; E. Kneringer; D. Kuhn; G. Rudolph; E. Bouhova-Thacker; C.K. Bowdery; D.P. Clarke; G. Ellis; A.J. Finch; F. Foster; G. Hughes; R.W.L. Jones; M.R. Pearson; N.A. Robertson; M. Smizanska; O. van Der Aa; C. Delaere; V. Lemaitre; U. Blumenschein; F. Hölldorfer; K. Jakobs; F. Kayser; A.-S. Müller; B. Renk; H.-G. Sander; S. Schmeling; H. Wachsmuth; C. Zeitnitz; T. Ziegler; A. Bonissent; P. Coyle; C. Curtil; A. Ealet; D. Fouchez; P. Payre; A. Tilquin; F. Ragusa; A. David; H. Dietl; G. Ganis; K. Hüttmann; G. Lütjens; W. Männer; H.-G. Moser; R. Settles; M. Villegas; G. Wolf; J. Boucrot; O. Callot; M. Davier; L. Duflot; J.-F. Grivaz; Ph. Heusse; A. Höcker; A. Jacholkowska; L. Serin; J.-J. Veillet; C.Z. Yuan; Zhiqing Zhang; P. Azzurri; G. Bagliesi; T. Boccali; L. Foà; A. Giammanco; A. Giassi; F. Ligabue; A. Messineo; F. Palla; G. Sanguinetti; A. Sciabà; G. Sguazzoni; P. Spagnolo; R. Tenchini; A. Venturi; P.G. Verdini; O. Awunor; G.A. Blair; G. Cowan; A. Garcia-Bellido; M.G. Green; T. Medcalf; A. Misiejuk; J.A. Strong; P. Teixeira-Dias; R.W. Clifft; T.R. Edgecock; P.R. Norton; I.R. Tomalin; J.J. Ward; B. Bloch-Devaux; D. Boumediene; P. Colas; B. Fabbro; E. Lançon; M.-C. Lemaire; E. Locci; P. Perez; J. Rander; B. Tuchming; B. Vallage; A.M. Litke; G. Taylor; C.N. Booth; S. Cartwright; F. Combley; P.N. Hodgson; M. Lehto; L.F. Thompson; A. Böhrer; S. Brandt; C. Grupen; J. Hess; A. Ngac; G. Prange; C. Borean; G. Giannini; H. He; J. Putz; J. Rothberg; S.R. Armstrong; K. Berkelman; K. Cranmer; D.P.S. Ferguson; Y. Gao; S. Gonzàlez; O.J. Hayes; H. Hu; S. Jin; J. Kile; P.A. Mcnamara Iii; J. Nielsen; Y.B. Pan; J.H. von Wimmersperg-Toeller; W. Wiedenmann; J. Wu; Sau Lan Wu; X. Wu; G. Zobernig; G. Dissertori

doi:10.1016/j.physrep.2005.06.007

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Branching ratios and spectral functions of tau decays: final ALEPH measurements and physics implications

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Branching ratios and spectral functions of tau decays: final ALEPH measurements and physics implications

S. Schael, R. Barate, R. Brunelière, I. de Bonis, D. Decamp, C. Goy, S. Jézéquel, J.P. Lees, F. Martin, E. Merle, …

Physics Reports, Vol.421, pp.191-284

2005

DOI: https://doi.org/10.1016/j.physrep.2005.06.007

Abstract

The full LEP-1 data set collected with the ALEPH detector at the $Z$ pole during 1991-1995 is analysed in order to measure the $\tau$ decay branching fractions. Extensive systematic studies are performed, in order to match the large statistics of the data sample corresponding to over 300 000 measured and identified $\tau$ decays. Branching fractions are obtained for the two leptonic channels and eleven hadronic channels defined by their respective numbers of charged particles and $\pi^0$'s. Using previously published ALEPH results on final states with charged and neutral kaons, corrections are applied to the hadronic channels to derive branching ratios for exclusive final states without kaons. Thus the analyses of the full LEP-1 ALEPH data are combined to yield a complete description of $\tau$ decays, encompassing 22 non-strange and 11 strange hadronic modes. Some physics implications of the results are given, in particular related to universality in the leptonic charged weak current, isospin invariance in $a_1$ decays, and the separation of vector and axial-vector components of the total hadronic rate. Finally, spectral functions are determined for the dominant hadronic modes and updates are given for several analyses. These include: tests of isospin invariance between the weak charged and electromagnetic hadronic currents, fits of the $\rho$ resonance lineshape, and a QCD analysis of the nonstrange hadronic decays using spectral moments, yielding the value $\alpha_s(m^2_\tau) = 0.340 \pm 0.005_{\rm exp} \pm 0.014_{\rm th}$. The evolution to the $Z$ mass scale yields $\alpha_s(M_Z^2) = 0.1209 \pm 0.0018$. This value agrees well with the direct determination from the $Z$ width and provides the most accurate test to date of asymptotic freedom in the QCD gauge theory

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Title: Branching ratios and spectral functions of tau decays: final ALEPH measurements and physics implications
Creators - without role: S. Schael - RWTH Aachen University
R. Barate - Centre de Gestion Scientifique
R. Brunelière - Centre de Gestion Scientifique
I. de Bonis - Centre de Gestion Scientifique
D. Decamp - Centre de Gestion Scientifique
C. Goy - Centre de Gestion Scientifique
S. Jézéquel - Centre de Gestion Scientifique
J.P. Lees - Centre de Gestion Scientifique
F. Martin - Centre de Gestion Scientifique
E. Merle - Centre de Gestion Scientifique
M.N. Minard - Centre de Gestion Scientifique
B. Pietrzyk - Centre de Gestion Scientifique
B. Trocmé - Centre de Gestion Scientifique
S. Bravo - Universitat Autònoma de Barcelona
M.P. Casado - Universitat Autònoma de Barcelona
M. Chmeissani - Universitat Autònoma de Barcelona
J.M. Crespo - Universitat Autònoma de Barcelona
E. Fernandez - Universitat Autònoma de Barcelona
M. Fernandez-Bosman
Ll. Garrido - Universitat Autònoma de Barcelona
M. Martinez
A. Pacheco - Universitat Autònoma de Barcelona
H. Ruiz - Universitat Autònoma de Barcelona
A. Colaleo
D. Creanza
N. de Filippis
M. de Palma
G. Iaselli
G. Maggi
M. Maggi
S. Nuzzo
A. Ranieri
G. Raso
F. Ruggieri
G. Selvaggi
L. Silvestris
P. Tempesta
A. Tricomi
G. Zito
X. Huang - Academia Sinica
Jiali Lin - Academia Sinica
Q. Ouyang - Academia Sinica
T. Wang - Academia Sinica
Y. Xie - Academia Sinica
R. Xu - Academia Sinica
S. Xue - Academia Sinica
L. Zhang - Academia Sinica
W. Zhao - Academia Sinica
D. Abbaneo - European Organization for Nuclear Research
T. Barklow - European Organization for Nuclear Research
O. Buchmüller - European Organization for Nuclear Research
M. Cattaneo - European Organization for Nuclear Research
B. Clerbaux - European Organization for Nuclear Research
H. Drevermann - European Organization for Nuclear Research
R.W. Forty - European Organization for Nuclear Research
M. Frank - European Organization for Nuclear Research
F. Gianotti - European Organization for Nuclear Research
J.B. Hansen - European Organization for Nuclear Research
J. Harvey - European Organization for Nuclear Research
D.E. Hutchcroft - European Organization for Nuclear Research
P. Janot - European Organization for Nuclear Research
B. Jost - European Organization for Nuclear Research
M. Kado - European Organization for Nuclear Research
P. Mato - European Organization for Nuclear Research
A. Moutoussi - European Organization for Nuclear Research
F. Ranjard - European Organization for Nuclear Research
L. Rolandi
D. Schlatter - European Organization for Nuclear Research
F. Teubert - European Organization for Nuclear Research
A. Valassi - European Organization for Nuclear Research
I. Videau - European Organization for Nuclear Research
F. Badaud - Institut Pascal
S. Dessagne - Institut Pascal
Alain Falvard - Laboratoire d'Informatique, de Modélisation et d'Optimisation des Systèmes
D. Fayolle - Laboratoire d'Informatique, de Modélisation et d'Optimisation des Systèmes
Pascal Gay - Institut Pascal
J. Jousset - Laboratoire d'Informatique, de Modélisation et d'Optimisation des Systèmes
B. Michel - Laboratoire d'Informatique, de Modélisation et d'Optimisation des Systèmes
S. Monteil - Laboratoire d'Informatique, de Modélisation et d'Optimisation des Systèmes
D. Pallin - Institut Pascal
J M. Pascolo - Laboratoire d'Informatique, de Modélisation et d'Optimisation des Systèmes
Pascal Perret - Laboratoire d'Informatique, de Modélisation et d'Optimisation des Systèmes
J.D. Hansen
J.R. Hansen
P.H. Hansen - University of Copenhagen
A.C. Kraan - University of Copenhagen
B.S. Nilsson - University of Copenhagen
A. Kyriakis
C. Markou
E. Simopoulou
A. Vayaki
K. Zachariadou
A. Blondel - Laboratoire d'Informatique de l'École Polytechnique
J.-C. Brient - Laboratoire d'Informatique de l'École Polytechnique
F. Machefert - Laboratoire d'Informatique de l'École Polytechnique
A. Rougé - Laboratoire d'Informatique de l'École Polytechnique
H. Videau - Laboratoire d'Informatique de l'École Polytechnique
V. Ciulli - University of Florence
E. Focardi - University of Florence
G. Parrini - University of Florence
A. Antonelli
M. Antonelli
G. Bencivenni
F. Bossi
G. Capon
F. Cerutti
V. Chiarella
P. Laurelli
G. Mannocchi
G.P. Murtas
L. Passalacqua
J. Kennedy - University of Glasgow
J.G. Lynch - University of Glasgow
P. Negus - University of Glasgow
V. O'Shea
A.S. Thompson - University of Glasgow
S. Wasserbaech - Utah Valley University
R. Cavanaugh - Heidelberg University
S. Dhamotharan - Heidelberg University
C. Geweniger - Heidelberg University
P. Hanke - Heidelberg University
V. Hepp - Heidelberg University
E.E. Kluge - Heidelberg University
A. Putzer - Heidelberg University
H. Stenzel - Heidelberg University
K. Tittel - Heidelberg University
M. Wunsch - Heidelberg University
R. Beuselinck - Imperial College London
W. Cameron - Imperial College London
G. Davies - Imperial College London
P.J. Dornan - Imperial College London
M. Girone - Imperial College London
J. Nowell - Imperial College London
S.A. Rutherford - Imperial College London
J.K. Sedgbeer - Imperial College London
J.C. Thompson - Imperial College London
R. White - Imperial College London
V.M. Ghete - Universität Innsbruck
P. Girtler - Universität Innsbruck
E. Kneringer - Universität Innsbruck
D. Kuhn - Universität Innsbruck
G. Rudolph - Universität Innsbruck
E. Bouhova-Thacker - Lancaster University
C.K. Bowdery - Lancaster University
D.P. Clarke - Lancaster University
G. Ellis - Lancaster University
A.J. Finch - Lancaster University
F. Foster - Lancaster University
G. Hughes - Lancaster University
R.W.L. Jones - Lancaster University
M.R. Pearson - Lancaster University
N.A. Robertson - Lancaster University
M. Smizanska - Lancaster University
O. van Der Aa - UCLouvain
C. Delaere - UCLouvain
V. Lemaitre
U. Blumenschein - Johannes Gutenberg University Mainz
F. Hölldorfer - Johannes Gutenberg University Mainz
K. Jakobs - Johannes Gutenberg University Mainz
F. Kayser - Johannes Gutenberg University Mainz
A.-S. Müller - Johannes Gutenberg University Mainz
B. Renk - Johannes Gutenberg University Mainz
H.-G. Sander
S. Schmeling - Johannes Gutenberg University Mainz
H. Wachsmuth - Johannes Gutenberg University Mainz
C. Zeitnitz - Johannes Gutenberg University Mainz
T. Ziegler - Johannes Gutenberg University Mainz
A. Bonissent - Centre de Gestion Scientifique
P. Coyle - Centre de Gestion Scientifique
C. Curtil - Centre de Gestion Scientifique
A. Ealet - Centre de Gestion Scientifique
D. Fouchez - Centre de Gestion Scientifique
P. Payre - Centre de Gestion Scientifique
A. Tilquin - Centre de Gestion Scientifique
F. Ragusa - University of Milan
A. David - Max Planck Society
H. Dietl - Max Planck Innovation
G. Ganis - Max Planck Innovation
K. Hüttmann - Max Planck Innovation
G. Lütjens - Max Planck Innovation
W. Männer - Max Planck Innovation
H.-G. Moser - Max Planck Innovation
R. Settles - Max Planck Innovation
M. Villegas - Max Planck Society
G. Wolf
J. Boucrot - Université Paris Cité
O. Callot - Université Paris Cité
M. Davier - Université Paris Cité
L. Duflot - Université Paris Cité
J.-F. Grivaz - Université Paris Cité
Ph. Heusse - Université Paris Cité
A. Höcker - Université Paris Cité
A. Jacholkowska - Laboratoire de l'Accélérateur Linéaire
L. Serin - Université Paris Cité
J.-J. Veillet - Université Paris Cité
C.Z. Yuan - Université Paris Cité
Zhiqing Zhang - Université Paris Cité
P. Azzurri
G. Bagliesi
T. Boccali
L. Foà
A. Giammanco
A. Giassi
F. Ligabue
A. Messineo
F. Palla
G. Sanguinetti
A. Sciabà
G. Sguazzoni
P. Spagnolo
R. Tenchini
A. Venturi
P.G. Verdini
O. Awunor - University of London
G.A. Blair - University of London
G. Cowan - University of London
A. Garcia-Bellido - University of London
M.G. Green - University of London
T. Medcalf - University of London
A. Misiejuk - University of London
J.A. Strong - University of London
P. Teixeira-Dias - University of London
R.W. Clifft - Rutherford Appleton Laboratory
T.R. Edgecock - Rutherford Appleton Laboratory
P.R. Norton - Rutherford Appleton Laboratory
I.R. Tomalin - Rutherford Appleton Laboratory
J.J. Ward - Rutherford Appleton Laboratory
B. Bloch-Devaux
D. Boumediene
P. Colas
B. Fabbro
E. Lançon
M.-C. Lemaire
E. Locci
P. Perez
J. Rander
B. Tuchming
B. Vallage
A.M. Litke - University of California, Santa Cruz
G. Taylor - University of California, Santa Cruz
C.N. Booth - University of Sheffield
S. Cartwright - University of Sheffield
F. Combley - University of Sheffield
P.N. Hodgson - University of Sheffield
M. Lehto - University of Sheffield
L.F. Thompson - University of Sheffield
A. Böhrer
S. Brandt
C. Grupen
J. Hess
A. Ngac
G. Prange
C. Borean - University of Trieste
G. Giannini - University of Trieste
H. He - Seattle University
J. Putz - Seattle University
J. Rothberg - Seattle University
S.R. Armstrong - University of Wisconsin–Madison
K. Berkelman - University of Wisconsin–Madison
K. Cranmer - University of Wisconsin–Madison
D.P.S. Ferguson - University of Wisconsin–Madison
Y. Gao - University of Wisconsin–Madison
S. Gonzàlez
O.J. Hayes - University of Wisconsin–Madison
H. Hu - University of Wisconsin–Madison
S. Jin - University of Wisconsin–Madison
J. Kile - University of Wisconsin–Madison
P.A. Mcnamara Iii
J. Nielsen - University of Wisconsin–Madison
Y.B. Pan - University of Wisconsin–Madison
J.H. von Wimmersperg-Toeller - University of Wisconsin–Madison
W. Wiedenmann - Max Planck Society
J. Wu - University of Wisconsin–Madison
Sau Lan Wu
X. Wu - University of Wisconsin–Madison
G. Zobernig - University of Wisconsin–Madison
G. Dissertori
Publication Details: Physics Reports, Vol.421, pp.191-284
Identifiers: 9942832109311
Academic Unit: Université de Montpellier
Language: English
Resource Type: Journal article
Local Fields: in2p3-00024366