학술논문

Measurement of Tau branching ratios
Document Type
Article
Author
Decamp, D.Deschizeaux, B.Goy, C.Lees, J. -P.Minard, M. -N.Alemany, R.Crespo, J. M.Delfino, M.Fernandez, E.Gaitan, V.Garrido, Ll.Mir, Ll. M.Pacheco, A.Catanesi, M. G.Creanza, D.de Palma, M.Farilla, A.Iaselli, G.Maggi, G.Maggi, M.Natali, S.Nuzzo, S.Quattromini, M.Ranieri, A.Raso, G.Romano, F.Ruggieri, F.Selvaggi, G.Silvestris, L.Tempesta, P.Zito, G.Hu, H.Huang, D.Huang, X.Lin, J.Lou, J.Qiao, C.Ruan, T.Wang, T.Xie, Y.Xu, D.Xu, R.Zhang, J.Zhao, W.Atwood, W. B.Bauerdick, L. A. T.Bird, F.Blucher, E.Bonvicini, G.Bossi, F.Boudreau, J.Burnett, T. H.Drevermann, H.Forty, R. W.Grab, C.Hagelberg, R.Haywood, S.Hilgart, J.Jost, B.Kasemann, M.Knobloch, J.Lacourt, A.Lançon, E.Lehraus, I.Lohse, T.Lusiani, A.Marchioro, A.Martinez, M.Mato, P.Menary, S.Meyer, T.Minten, A.Miotto, A.Miquel, R.Moser, H. -G.Nash, J.Palazzi, P.Ranjard, F.Redlinger, G.Rolandi, L.Roth, A.Rothberg, J.Saich, M.Schlatter, D.Schmelling, M.Tejessy, W.Wachsmuth, H.Wasserbaech, S.Wiedenmann, W.Witzeling, W.Wotschack, J.Ajaltouni, Z.Badaud, F.Bardadin-Otwinowska, M.Bencheikh, A. M.El Fellous, R.Falvard, A.Gay, P.Guicheney, C.Henrard, P.Jousset, J.Michel, B.Montret, J. -C.Pallin, D.Perret, P.Pietrzyk, B.Proriol, J.Prulhière, F.Stimpfl, G.Hansen, J. D.Hansen, J. R.Hansen, P. H.Møllerud, R.Nilsson, B. S.Efthymiopoulos, I.Simopoulos, E.Vayaki, A.Badier, J.Blondel, A.Bonneaud, G.Brient, J. C.Fouque, G.Gamess, A.Harvey, J.Orteu, S.Rosowsky, A.Rougé, A.Rumpf, M.Tanaka, R.Videau, H.Candlin, D. J.Veitch, E.Moneta, L.Parrini, G.Corden, M.Georgiopoulos, C.Ikeda, M.Lannutti, J.Levinthal, D.Mermikides, M.Sawyer, L.Antonelli, A.Baldini, R.Bencivenni, G.Bologna, G.Campana, P.Capon, G.Cerutti, F.Chiarella, V.D'Ettore-Piazzoli, B.Felici, G.Laurelli, P.Mannocchi, G.Murtas, F.Murtas, G. P.Passalacqua, L.Pepe-Altarelli, M.Picchi, P.Zografou, P.Altoon, B.Boyle, O.Colrain, P.Halley, A. W.ten Have, I.Lynch, J. G.Maitland, W.Morton, W. T.Raine, C.Scarr, J. M.Smith, K.Thompson, A. S.Turnbull, R. M.Brandl, B.Braun, O.Geiges, R.Geweniger, C.Hanke, P.Hepp, V.Kluge, E. E.Maumary, Y.Putzer, A.Rensch, B.Stahl, A.Tittel, K.Wunsch, M.Belk, A. T.Beuselinck, R.Binnie, D. M.Cameron, W.Cattaneo, M.Dornan, P. J.Dugeay, S.Greene, A. M.Hassard, J. F.Lieske, N. M.Patton, S. J.Payne, D. G.Phillips, M. J.Sedgbeer, J. K.Taylor, G.Tomalin, I. R.Wright, A. G.Girtler, P.Kuhn, D.Rudolph, G.Bowdery, C. K.Broodbeck, T. J.Finch, A. J.Foster, F.Hughes, G.Jackson, D.Keemer, N. R.Nuttall, M.Patel, A.Sloan, T.Snow, S. W.Whelan, E. P.Barczewski, T.Kleinknecht, K.Raab, J.Renk, B.Roehn, S.Sander, H. -G.Schmidt, H.Steeg, F.Walther, S. M.Wolf, B.Aubert, J. -J.Benchouk, C.Bernard, V.Bonissent, A.Carr, J.Coyle, P.Drinkhard, J.Etienne, F.Papalexiou, S.Payre, P.Qian, Z.Rousseau, D.Schwemling, P.Talby, M.Adlung, S.Becker, H.Blum, W.Brown, D.Cattaneo, P.Cowan, G.Dehning, B.Dietl, H.Dydak, F.Fernandez-Bosman, M.Hansl-Kosanecka, T.Jahn, A.Kozanecki, W.Lange, E.Lauber, J.Lütjens, G.Lutz, G.Männer, W.Richter, R.Rotscheidt, H.Schröder, J.Schwarz, A. S.Settles, R.Stierlin, U.Stiegler, U.Denis, R. St.Takashima, M.Thomas, J.Wolf, G.Bertin, V.Boucrot, J.Callot, O.Chen, X.Cordier, A.Davier, M.Grivaz, J. -F.Heusse, Ph.Janot, P.Kim, D. W.Le Diberder, F.Lefrançois, J.Lutz, A. -M.Schune, M. -H.Veillet, J. -J.Videau, I.Zhang, Z.Zomer, F.Abbaneo, D.Amendolia, S. R.Bagliesi, G.Batignani, G.Bosisio, L.Bottigli, U.Bradaschia, C.Carpinelli, M.Ciocci, M. A.Dell'Orso, R.Ferrante, I.Fidecaro, F.Foà, L.Focardi, E.Forti, F.Gatto, C.Grassi, A.Giorgi, M. A.Ligabue, F.Mannelli, E. B.Marrocchesi, P. S.Messineo, A.Palla, F.Sanguinetti, G.Steinberger, J.Tenchini, R.Tonelli, G.Triggiani, G.Vannini, C.Venturi, A.Verdini, P. G.Walsh, J.Carter, J. M.Green, M. G.March, P. V.Medcalf, T.Quasi, I. S.Strong, J. A.West, L. R.Wildish, T.Botterill, D. R.Clifft, R. W.Edgecock, T. R.Edwards, M.Fisher, S. M.Jones, T. J.Norton, P. R.Salmon, D. P.Thompson, J. C.Bloch-Devaux, B.Colas, P.Locci, E.Loucatos, S.Monnier, E.Perez, P.Perlas, J. A.Perrier, F.Rander, J.Renardy, J. -F.Roussarie, A.Schuller, J. -P.Schwindling, J.Vallage, B.Ashman, J. G.Booth, C. N.Buttar, C.Carney, R. E.Cartwright, S.Combley, F.Dogru, M.Hatfield, F.Martin, J.Parker, D.Reeves, P.Thompson, L. F.Barberio, E.Brandt, S.Grupen, C.Meinhard, H.Mirabito, L.Schäfer, U.Seywerd, H.Ganis, G.Giannini, G.Gobbo, B.Ragusa, F.Bellantoni, L.Cinabro, D.Conway, J. S.Cowen, D. F.Feng, Z.Ferguson, D. P. S.Gao, Y. S.Grahl, J.Harton, J. L.Jared, R. C.Johnson, R. P.LeClaire, B. W.Lishka, C.Pan, Y. B.Pater, J. R.Saadi, Y.Sharma, V.Shi, Z. H.Tang, Y. H.Walsh, A. M.Wear, J. A.Weber, F. V.Whitney, M. H.Wu, Sau LanZobernig, G.
Source
Zeitschrift für Physik C Particles and Fields; June 1992, Vol. 54 Issue: 2 p211-228, 18p
Subject
Language
ISSN
01709739; 14315858
Abstract
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.