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Measurement of the tau polarisation at the Z resonance
Author(s) -
D. Buskulic,
J. A. de Vries,
C. Goy,
J.-P. Lees,
M.-N. Minard,
B. Mours,
B. Pietrzyk,
R. Alemany,
F. Ariztizabal,
P. Comas,
J.M. Crespo,
M. Delfino,
E. Fenandez,
M. Bosman,
V. Gaitan,
Ll. Garrido,
T. S. Mattison,
A. Pacheco,
C. Padilla Aranda,
Á. Pascual,
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,
Y. Chai,
H. M. Hu,
Dazhang Huang,
X. T. Huang,
J. Lin,
T. Wang,
Y. Xie,
D. Xu,
R. Xu,
J. Zhang,
W. Zhao,
L. A. T. Bauerdick,
E. Blücher,
G. Bonvicini,
J. Boudreau,
D. W. Casper,
H. Drevermann,
R.W. Forty,
G. Ganis,
C. Gay,
R. Hagelberg,
J. Harvey,
S. J. Haywood,
J. Hilgart,
R. Jacobsen,
B. Jost,
J. Knobloch,
I. Lehraus,
T. Lohse,
A. Lusiani,
M. Martı́nez,
P. Mató,
H. Meinhard,
A. Minten,
A. Miotto,
R. Miquel,
H.-G. Moser,
P. Palazzi,
J.A. Perlas,
J.-F. Pusztaszeri,
F. Ranjard,
G. Redlinger,
G. Rolandi,
J. Rothberg,
T. Ruan,
M. Saich,
D. Schlatter,
M. Schmelling,
F. Sefkow,
W. Tejessy,
H. Wachsmuth,
W. Wiedenmann,
T. Wildish,
W. Witzeling,
J. Wotschack,
Z. Ajaltouni,
F. Badaud,
M. Bardadin-Otwinowska,
R. El Fellous,
A. Falvard,
P. Gay,
Huirun Chen,
P. Henrard,
J. Jousset,
B. Michel,
J-C. Montret,
D. Pallin,
P. Perret,
F. Podlyski,
J. Proriol,
F. Prulhi�re,
F. Saadi,
T. Fearnley,
P. H. Hansen,
R. M�llerud,
B.S. Nilsson,
D.J. Candlin,
M.I. Parsons,
E. Veitch,
L. Moneta,
G. Parrini,
M. Corden,
C. Georgiopoulos,
M. Ikeda,
J. Lannutti,
D. Levinthal,
M. Mermikides,
L. Sawyer,
S. Wasserbaech,
A. Antonelli,
R. Baldini,
G. Bencivenni,
G. Bologna,
F. Bossi,
P. Campana,
G. Capon,
F. Cerutti,
V. Chiarella,
B. D’Ettorre-Piazzoli,
G. Felici,
P. Laurelli,
G. Mannocchi,
F. Murtas,
G.P. Murtas,
L. Passalacqua,
M. Pepe-Altarelli,
P. Picchi,
P. Colrain,
I. ten Have,
J.G. Lynch,
W. Maitland,
W.T. Morton,
C. Raine,
P. Reeves,
J.M. Scarr,
K. Smith,
M.G. Smith,
A. S. Thompson,
R.M. Turnbull,
B. Brandl,
O. Braun,
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,
D.J. Colling,
P.J. Dornan,
S. Dugeay,
A.M. Greene,
J. F. Hassaed,
N.M. Lieske,
J. Nash,
D.G. Payne,
M.J. Phillips,
J.K. Sedgbeer,
I. R. Tomalin,
A.G. Wright,
P. Girtler,
E. Kneringer,
D. Kühn,
G. Rudolph,
C.K. Bowdery,
T.J. Brodbeck,
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,
I. Efthymiopoulos,
A. Kyriakis,
E. Simopoulou,
A. Vayaki,
K. Zachariadou,
J. Badier,
A. Blondel,
G. R. Bonneaud,
Jean-Claude Brient,
G. Fouque,
S. Orteu,
Anne Stidsholt Roug,
M. Rumpf,
R. Tanaka,
M. Verderi,
H. Videau,
S. Adlung,
R. Aßmann,
C. Bauer,
W. Blum,
D. N. Brown,
P. W. Cattaneo,
B. Dehning,
H. Dietl,
F. Dydak,
M. Frank,
A.W. Halley,
J. Lauber,
G. L�tjens,
G. Lutz,
W. M�nner,
R. Richter,
H. Rotscheidt,
J. Schr�der,
A.S. Schwarz,
R. Settles,
H. Seywerd,
U. Stierlin,
U. Stiegler,
R. St. Denis,
J. Boucrot,
O. Callot,
A. Cordier,
M. Davier,
L. Duflot,
J.-F. Grivaz,
Ph. Heusse,
D. E. Jaffe,
P. Janot,
D. W. Kim,
F. Le Diberder,
J. Lefraņois,
A.-M. Lutz,
M. H. Schune,
J.-J. Veillet,
I. Videau,
Z. Zhang,
D. Abbaneo,
G. Bagliesi,
G. Batignani,
L. Bosisio,
U. Bottigli,
C. Bozzi,
G. Calderini,
M. Carpinelli,
M. A. Ciocci,
R. Dell’Orso,
I. Ferrante,
F. Fidecaro,
L. Foà,
E. Focardi,
F. Forti,
A. Giassi,
M. A. Giorgi,
A. Gregorio,
F. Ligabue,
E.B. Mannelli,
P.S. Marrocchesi,
A. Messineo,
F. Palla,
G. Rizzo,
G. Sanguinetti,
P. Spagnolo,
J. Steinberger,
R. Tenchini,
G. Tonelli,
G. Triggiani,
C. Vannini,
A. Venturi,
P. G. Verdini,
J. Walsh,
A.P. Betteridge,
J.M. Carter,
M. G. Green,
P.V. March,
Ll.M. Mir,
T. Medcalf,
I.S. Quazi,
J.A. Strong,
L.R. West,
D. Botterill,
R.W. Clifft,
T.R. Edgecock,
M. Edwards,
S.M. Fisher,
T. J. Jones,
P.R. Norton,
D.P. Salmon,
J. Thompson,
K. Kleinknecht,
J. Raab,
B. Renk,
H.G. Sander,
H. Schmidt,
F. Steeg,
S.M. Walther,
R. Wanke,
Bettina Wolf,
J.J. Aubert,
A.M. Bencheikh,
C. Benchouk,
A. Bonissent,
J. Carr,
P. Coyle,
J. Drinkard,
F. Etienne,
D. Nicod,
Simon Michael Papalexiou,
P. Payre,
L. Roos,
D. Rousseau,
Philippe Schwemling,
M. Talby,
B. Bloch-Devaux,
P. Colas,
H. Duarte,
W. Kozanecki,
E. Lan�on,
M.C. Lemaire,
E. Locci,
P. Rodriguez Perez,
Frédéric Perrier,
J. Rander,
J.-F. Renardy,
A. Rosowsky,
A. Roussarie,
J.-P. Schuller,
J. Schwindling,
D. Si Mohand,
B. Vallage,
R. P. Johnson,
A. M. Litke,
G. Taylor,
J. Wear,
J.G. Ashman,
W. Babbage,
C.N. Booth,
C. M. Buttar,
R. Carney,
S. Cartwright,
F. Combley,
F. Hatfield,
L.F. Thompson,
E. L. Barberio,
A. B�hrer,
S. Brandt,
G. Cowan,
C. Grupen,
G. Lutters,
F. Rivera,
U. Sch�fer,
R. Della Marina,
G. Giannini,
B. Gobbo,
F. Ragusa,
L. Bellantoni,
W. Chen,
D. Cinabro,
J. S. Conway,
D.F. Cowen,
M. Feng,
D.P.S. Ferguson,
Y. Gao,
J. Grahl,
J. L. Harton,
R.C. Jared,
B.W. LeClaire,
C. Lishka,
Y.B. Pan,
J. R. Pater,
Y. Saadi,
M. Schmitt,
V. Sharma,
Z.H. Shi,
A. M. Walsh,
F.V. Weber,
S. L. Wu,
X. Wu,
M. Zheng,
G. Zobernig
Publication year - 1993
Publication title -
zeitschrift für physik c
Language(s) - English
Resource type - Journals
eISSN - 1431-5858
pISSN - 0170-9739
DOI - 10.1007/bf01498618
Subject(s) - physics , electron–positron annihilation , universality (dynamical systems) , nuclear physics , particle physics , electron , elementary particle , resonance (particle physics) , hadron , quantum mechanics
Using 18.8 pb−1 of data collected in 1990 and 1991, ALEPH has measured the tau polarisation in the decay modes τ→ev vˉ , τ→μv vˉ , τ→πν, τ→ρν and τ→a 1ν, using both the individual tau decay kinematics and the event acollinearity. The measurement of the tau polarisation as a function of the production polar angle yields the two parametersA τ andA e , whereA l =2g v l g A l /(g v l )2+(g A l )2] The resultsA τ=0.143±0.023 andA e =0.120±0.026 are consistent with the hypothesis of electron-tau universality. Assuming universality yields a measurement of the effective weak mixing angle sin2θ w eff=0.2332±0.0022

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