A measurement of the $\tau^{-} \to \mu^{-} \nu_{\mu} \nu_{\tau}$ branching ratio

The tau /sup -/ to mu /sup -/ nu /sub mu / nu /sub tau / branching ratio has been measured using data collected from 1990 to 1995 by the OPAL detector at the LEP collider. The resulting value of B( tau /sup -/ to mu /sup -/ nu /sub mu / nu /sub tau /) = 0.1734 +or- 0.0009 (stat) +or- 0.0006(syst) ha...

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Autores principales: Abbiendi, G, Ainsley, C, Åkesson, P F, Alexander, G, Allison, J, Amaral, P, Anagnostou, G, Anderson, K J, Arcelli, S, Asai, S, Axen, D A, Azuelos, Georges, Bailey, I, Barberio, E, Barlow, R J, Batley, J Richard, Bechtle, P, Behnke, T, Bell, K W, Bell, P J, Bella, G, Bellerive, A, Benelli, G, Bethke, Siegfried, Biebel, O, Bloodworth, Ian J, Boeriu, O, Bock, P, Bonacorsi, D, Boutemeur, M, Braibant, S, Brigliadori, L, Brown, R M, Büsser, K, Burckhart, H J, Campana, S, Carnegie, R K, Caron, B, Carter, A A, Carter, J R, Chang, C Y, Charlton, D G, Csilling, Akos, Cuffiani, M, Dado, S, Dallison, S, de Roeck, A, De Wolf, E A, Desch, Klaus, Dienes, B, Donkers, M, Dubbert, J, Duchovni, E, Duckeck, G, Duerdoth, I P, Elfgren, E, Etzion, E, Fabbri, Franco Luigi, Feld, L, Ferrari, P, Fiedler, F, Fleck, I, Ford, M, Frey, A, Fürtjes, A, Gagnon, P, Gary, J W, Gaycken, G, Geich-Gimbel, C, Giacomelli, G, Giacomelli, P, Giunta, M, Goldberg, J, Gross, E, Grunhaus, Jacob, Gruwé, M, Günther, P O, Sen-Gupta, A, Hajdu, C, Hamann, M, Hanson, G G, Harder, K, Harel, A, Harin-Dirac, M, Hauschild, M, Hauschildt, J, Hawkes, C M, Hawkings, R, Hemingway, Richard J, Hensel, C, Herten, G, Heuer, R D, Hill, J C, Hoffman, K, Homer, R J, Horváth, D, Howard, R, Igo-Kemenes, P, Ishii, K, Jeremie, H, Jovanovic, P, Junk, T R, Kanaya, N, Kanzaki, J, Karapetian, G V, Karlen, Dean A, Kartvelishvili, V G, Kawagoe, K, Kawamoto, T, Keeler, Richard K, Kellogg, R G, Kennedy, B W, Kim, D H, Klein, K, Klier, A, Kluth, S, Kobayashi, T, Kobel, M, Komamiya, S, Kormos, L L, Krämer, T, Kress, T, Krieger, P, Von Krogh, J, Krop, D, Krüger, K, Kühl, T, Kupper, M, Lafferty, G D, Landsman, Hagar Yaël, Lanske, D, Layter, J G, Leins, A, Lellouch, D, Letts, J, Levinson, L, Lillich, J, Lloyd, S L, Loebinger, F K, Lü, J, Ludwig, J, MacPherson, A, Mader, W, Marcellini, S, Marchant, T E, Martin, A J, Martin, J P, Masetti, G, Mashimo, T, Mättig, P, McDonald, W J, McKenna, J A, McMahon, T J, McPherson, R A, Meijers, F, Méndez-Lorenzo, P, Menges, W, Merritt, F S, Mes, H, Michelini, Aldo, Mihara, S, Mikenberg, G, Miller, D J, Moed, S, Mohr, W, Mori, T, Mutter, A, Nagai, K, Nakamura, I, Neal, H A, Nisius, R, O'Neale, S W, Oh, A, Okpara, A N, Oreglia, M J, Orito, S, Pahl, C, Pásztor, G, Pater, J R, Patrick, G N, Pilcher, J E, Pinfold, J L, Plane, D E, Poli, B, Polok, J, Pooth, O, Przybycien, M B, Quadt, A, Rabbertz, K, Rembser, C, Renkel, P, Rick, Hartmut, Roney, J M, Rosati, S, Rozen, Y, Runge, K, Sachs, K, Saeki, T, Sahr, O, Sarkisyan-Grinbaum, E, Schaile, A D, Schaile, O, Scharff-Hansen, P, Schieck, J, Schörner-Sadenius, T, Schröder, M, Schumacher, M, Schwick, C, Scott, W G, Seuster, R, Shears, T G, Shen, B C, Sherwood, P, Siroli, G P, Skuja, A, Smith, A M, Sobie, R J, Söldner-Rembold, S, Spanó, F, Stahl, A, Stephens, K, Strom, D, Ströhmer, R, Tarem, S, Tasevsky, M, Taylor, R J, Teuscher, R, Thomson, M A, Torrence, E, Toya, D, Tran, P, Trefzger, T M, Tricoli, A, Trigger, I, Trócsányi, Z L, Tsur, E, Turner-Watson, M F, Ueda, I, Ujvári, B, Vachon, B, Vollmer, C F, Vannerem, P, Verzocchi, M, Voss, H, Vossebeld, Joost Herman, Waller, D, Ward, C P, Ward, D R, Watkins, P M, Watson, A T, Watson, N K, Wells, P S, Wengler, T, Wermes, N, Wetterling, D, Wilson, G W, Wilson, J A, Wolf, G, Wyatt, T R, Yamashita, S, Zer-Zion, D, Zivkovic, L
Lenguaje:eng
Publicado: 2003
Materias:
Particle Physics - Experiment
Acceso en línea:http://cds.cern.ch/record/619268
Descripción
Sumario:The tau /sup -/ to mu /sup -/ nu /sub mu / nu /sub tau / branching ratio has been measured using data collected from 1990 to 1995 by the OPAL detector at the LEP collider. The resulting value of B( tau /sup -/ to mu /sup -/ nu /sub mu / nu /sub tau /) = 0.1734 +or- 0.0009 (stat) +or- 0.0006(syst) has been used in conjunction with other OPAL measurements to test lepton universality, yielding the coupling constant ratios g/sub mu //g/sub e/ = 1.0005 +or- 0.0044 and g/sub tau //g/sub e/ = 1.0031 +or- 0.0048, in good agreement with the Standard Model prediction of unity. A value for the Michel parameter eta = 0.004 +or- 0.037 has also been determined and used to find a limit for the mass of the charged Higgs boson, m/sub H/+or- > 1.28 tan beta , in the minimal supersymmetric standard model. (23 refs).CER 4095216 BASE L 13

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