Open AccessMeasurement of Tau branching ratios
Author(s) -
D. Décamp,
B. Deschizeaux,
C. Goy,
J.-P. Lees,
M.-N. Minard,
R. Alemany,
J.M. Crespo,
M. Delfino,
E. Fernández,
V. Gaitan,
Ll. Garrido,
L. M. Mir,
A. Pacheco,
M.G. Catanesi,
D. Creanza,
M. De Palma,
A. Farilla,
G. Iaselli,
G. Maggi,
M. Maggi,
S. Natali,
S. Nuzzo,
M. Quattromini,
A. Ranieri,
G. Raso,
F. Romanò,
F. Ruggieri,
G. Selvaggi,
L. Silvestris,
P. Tempesta,
G. Zito,
H. Hu,
D. Huang,
X. Huang,
J. Lin,
J. Lou,
C. F. Qiao,
T. Ruan,
T. Wang,
Y. Xie,
D. Xu,
R. Xu,
J. Zhang,
W. Zhao,
W. B. Atwood,
L. A. T. Bauerdick,
F. Bird,
E. Blücher,
G. Bonvicini,
F. Bossi,
J. Boudreau,
T. H. Burnett,
H. Drevermann,
R.W. Forty,
C. Grab,
R. Hagelberg,
S. J. Haywood,
J. Hilgart,
B. Jost,
M. Kasemann,
J. Knobloch,
A. Lacourt,
E. Lançon,
I. Lehraus,
T. Lohse,
A. Lusiani,
A. Marchioro,
M. Martı́nez,
P. Mató,
S. Menary,
C. Meyer,
A. Minten,
A. Miotto,
R. Miquel,
H.-G. Moser,
J. Nash,
P. Palazzi,
F. Ranjard,
G. Redlinger,
G. Rolandi,
A. Roth,
J. Rothberg,
M. Saich,
D. Schlatter,
M. Schmelling,
W. Tejessy,
H. Wachsmuth,
S. Wasserbaech,
W. Wiedenmann,
W. Witzeling,
J. Wotschack,
Z. Ajaltouni,
F. Badaud,
M. Bardadin-Otwinowska,
A.M. Bencheikh,
R. El Fellous,
A. Falvard,
P. Gay,
C. Guicheney,
P. Henrard,
J. Jousset,
B. Michel,
Jean-Claude Montret,
D. Pallin,
P. Perret,
B. Pietrzyk,
J. Proriol,
F. Prulhière,
G. Stimpfl,
P. H. Hansen,
R. Møllerud,
B.S. Nilsson,
I. Efthymiopoulos,
E.T. Simopoulos,
A. Vayaki,
J. Badier,
A. Blondel,
G. R. Bonneaud,
J.C. Brient,
G. Fouque,
A. Gamess,
J. Harvey,
S. Orteu,
A. Rosowsky,
A. Rougé,
M. Rumpf,
R. Tanaka,
H. Videau,
D.J. Candlin,
E. Veitch,
L. Moneta,
G. Parrini,
M. Corden,
C. Georgiopoulos,
M. Ikeda,
J. Lannutti,
D. Levinthal,
M. Mermikides,
L. Sawyer,
A. Antonelli,
R. Baldini,
G. Bencivenni,
G. Bologna,
P. Campana,
G. Capon,
F. Cerutti,
V. Chiarella,
B. D'Ettore-Piazzoli,
G. Felici,
P. Laurelli,
G. Mannocchi,
F. Murtas,
G.P. Murtas,
L. Passalacqua,
M. Pepe-Altarelli,
P. Picchi,
P. Zografou,
B. Altoon,
O. Boyle,
P. Colrain,
A.W. Halley,
I. ten Have,
J.G. Lynch,
W. Maitland,
W.T. Morton,
C. Raine,
J.M. Scarr,
K. Smith,
A. S. Thompson,
R.M. Turnbull,
B. Brandl,
O. Braun,
R. Geiges,
C. Geweniger,
P. Hanke,
V. Hepp,
E.-E. Kluge,
Y. Maumary,
A. Putzer,
B. Rensch,
A. Stahl,
K. Tittel,
M. Wunsch,
A.T. Belk,
R. Beuselinck,
D.M. Binnie,
W. Cameron,
M. Cattaneo,
P.J. Dornan,
S. Dugeay,
A.M. Greene,
J.F. Hassard,
N.M. Lieske,
S. Patton,
D.G. Payne,
M.J. Phillips,
J.K. Sedgbeer,
G. Taylor,
I. R. Tomalin,
A.G. Wright,
P. Girtler,
D. Kühn,
G. Rudolph,
C.K. Bowdery,
T. J. Broodbeck,
A.J. Finch,
F. Foster,
G. Hughes,
D. J. Jackson,
N.R. Keemer,
M. Nuttall,
Apoorva Patel,
T. Sloan,
S.W. Snow,
E.P. Whelan,
T. Barczewski,
K. Kleinknecht,
J. Raab,
B. Renk,
S. Roehn,
H.G. Sander,
H. Schmidt,
F. Steeg,
S.M. Walther,
B. Wolf,
J.J. Aubert,
C. Benchouk,
Véronique Bernard,
A. Bonissent,
J. Carr,
P. Coyle,
J. Drinkhard,
F. Etienne,
Simon Michael Papalexiou,
P. Payre,
Z. Qian,
D. Rousseau,
P. Schwemling,
M. Talby,
S. Adlung,
H. Becker,
W. Blum,
D. N. Brown,
P. W. Cattaneo,
G. Cowan,
B. Dehning,
H. Dietl,
F. Dydak,
M. Bosman,
T. Hansl-Kosanecka,
A. Jahn,
W. Kozanecki,
E. Lange,
J. Lauber,
G. Lütjens,
G. Lutz,
W. Männer,
R. Richter,
H. Rotscheidt,
J. Schröder,
A.S. Schwarz,
R. Settles,
U. Stierlin,
U. Stiegler,
R. St. Denis,
M. Takashima,
J. Thomas,
V. Bertin,
J. Boucrot,
O. Callot,
X. Chen,
A. Cordier,
M. Davier,
J.-F. Grivaz,
Ph. Heusse,
P. Janot,
D. W. Kim,
F. Le Diberder,
J. Lefrançois,
A.-M. Lutz,
M. H. Schune,
J.-J. Veillet,
I. Videau,
Z. Zhang,
F. Zomer,
D. Abbaneo,
S. R. Amendolia,
G. Bagliesi,
G. Batignani,
L. Bosisio,
U. Bottigli,
C. Bradaschia,
M. Carpinelli,
M. A. Ciocci,
R. Dell’Orso,
I. Ferrante,
F. Fidecaro,
L. Foá,
E. Focardi,
F. Forti,
C. Gatto,
A. Grassi,
M. A. Giorgi,
F. Ligabue,
E.B. Mannelli,
P.S. Marrocchesi,
A. Messineo,
F. Palla,
G. Sanguinetti,
J. Steinberger,
R. Tenchini,
G. Tonelli,
G. Triggiani,
C. Vannini,
A. Venturi,
P. G. Verdini,
J. Walsh,
J. M. Carter,
M.G. Green,
P.V. March,
T. Medcalf,
I.S. Quasi,
J.A. Strong,
L.R. West,
T. Wildish,
D. Botterill,
R.W. Clifft,
T.R. Edgecock,
M. Edwards,
S.M. Fisher,
T. J. Jones,
P.R. Norton,
D.P. Salmon,
J.C. Thompson,
B. Bloch-Devaux,
P. Colas,
E. Locci,
S. Loucatos,
E. Monnier,
P. Perez,
J.A. Perlas,
Frédéric Perrier,
J. Rander,
J.-F. Renardy,
A. Roussarie,
J.-P. Schuller,
J. Schwindling,
B. Vallage,
J.G. Ashman,
C.N. Booth,
C. M. Buttar,
R. Carney,
S. Cartwright,
F. Combley,
M. Doḡru,
F. Hatfield,
J.P. Martin,
D. Parker,
P. Reeves,
L.F. Thompson,
E. L. Barberio,
S. Brandt,
C. Grupen,
H. Meinhard,
L. Mirabito,
U. Schäfer,
H. Seywerd,
G. Ganis,
G. Giannini,
B. Gobbo,
F. Ragusa,
L. Bellantoni,
D. Cinabro,
J. S. Conway,
D.F. Cowen,
M. Feng,
D.P.S. Ferguson,
Y. S. Gao,
J. Grahl,
J. L. Harton,
R.C. Jared,
R. P. Johnson,
B.W. LeClaire,
C. Lishka,
Y.B. Pan,
J. R. Pater,
Y. Saadi,
V. Sharma,
Z.H. Shi,
Yingao Tang,
A. M. Walsh,
J. Wear,
F.V. Weber,
Milton Whitney,
S. L. Wu,
G. Zobernig
Publication year - 1992
Publication title -
zeitschrift für physik c
Language(s) - English
Resource type - Journals
eISSN - 1431-5858
pISSN - 0170-9739
DOI - 10.1007/bf01566649
Subject(s) - branching (polymer chemistry) , physics , branching fraction , hadron , lepton , pion , aleph , nuclear physics , universality (dynamical systems) , electron–positron annihilation , particle physics , chemistry , electron , quantum mechanics , organic chemistry
Using the data accumulated at LEP in 1989 and 1990 with the ALEPH detector, the inclusive and exclusive branching ratios of the t lepton have been measured assuming lepton universality inZ0 decays. The inclusive branching fractions for the t decay into one, three, and five charged particles have been determined to be (85.45±0.97)%, (14.35±0.48)%, and (0.10±0.05)%, respectively, in agreement with the world averages. New undetected decay modes are determined to have a branching fraction of less than 2.1% at 95% CL. The measured branching ratios for quasi-exclusive channels are slightly larger than, but consistent with the world averages, except for the modes t?3 hadrons+vt andt?hadron+2p0vt, which are significantly larger. These latter branching ratios have been found to be (9.5±0.7)% and (10.2±1.1)%, respectively. The sum of all the measured quasi-exclusive branching ratios is (100.4±1.8)%. A fully exclusive analysis of modes with neutral pions shows no evidence for new photonic decay modes with a branching fraction limit of 3.4% at 95% CL.
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