학술논문

A search for lepton flavour violating Z0 decays
Document Type
Original Paper
Author
Akers, R.Alexander, G.Allison, J.Altekamp, N.Ametewee, K.Anderson, K. J.Anderson, S.Arcelli, S.Asai, S.Axen, D.Azuelos, G.Ball, A. H.Barberio, E.Barlow, R. J.Bartoldus, R.Batley, J. R.Beaudoin, G.Bethke, S.Beck, A.Beck, G. A.Beeston, C.Behnke, T.Bell, K. W.Bella, G.Bentvelsen, S.Berlich, P.Bechtluft, J.Biebel, O.Bloodworth, I. J.Bock, P.Bosch, H. M.Boutemeur, M.Braibant, S.Bright-Thomas, P.Brown, R. M.Buijs, A.Burckhart, H. J.Bürgin, R.Burgard, C.Capiluppi, P.Carnegie, R. K.Carter, A. A.Carter, J. R.Chang, C. Y.Charlesworth, C.Charlton, D. G.Chu, S. L.Clarke, P. E. L.Clayton, J. C.Clowes, S. G.Cohen, I.Conboy, J. E.Cooke, O. C.Cuffiani, M.Dado, S.Dallapiccola, C.Dallavalle, G. M.Darling, C.De Jong, S.del Pozo, L. A.Deng, H.Dixit, M. S.do Couto e Silva, E.Duboscq, J. E.Duchovni, E.Duckeck, G.Duerdoth, I. P.Dunwoody, U. C.Edwards, J. E. G.Estabrooks, P. G.Evans, H. G.Fabbri, F.Fabbro, B.Fanti, M.Fath, P.Fiedler, F.Fierro, M.Fincke-Keeler, M.Fischer, H. M.Folman, R.Fong, D. G.Foucher, M.Fukui, H.Fürtjes, A.Gagnon, P.Gaidot, A.Gary, J. W.Gascon, J.Geddes, N. I.Geich-Gimbel, C.Gensler, S. W.Gentit, F. X.Geralis, T.Giacomelli, G.Giacomelli, P.Giacomelli, R.Gibson, V.Gibson, W. R.Gillies, J. D.Goldberg, J.Gingrich, D. M.Goodrick, M. J.Gorn, W.Grandi, C.Gross, E.Hanson, G. G.Hansroul, M.Hapke, M.Hargrove, C. K.Hart, P. A.Hartmann, C.Hauschild, M.Hawkes, C. M.Hawkings, R.Hemingway, R. J.Herten, G.Heuer, R. D.Hill, J. C.Hillier, S. J.Hilse, T.Hobson, P. R.Hochman, D.Homer, R. J.Honma, A. K.Howard, R.Hughes-Jones, R. E.Hutchcroft, D. E.Igo-Kemenes, P.Imrie, D. C.Jawahery, A.Jeffreys, P. W.Jeremie, H.Jimack, M.Joly, A.Jones, M.Jones, R. W. L.Jovanovic, P.Karlen, D.Kanzaki, J.Kawagoe, K.Kawamoto, T.Keeler, R. K.Kellogg, R. G.Kennedy, B. W.King, B. J.King, J.Kirk, J.Kluth, S.Kobayashi, T.Kobel, M.Koetke, D. S.Kokott, T. P.Komamiya, S.Kowalewski, R.Kress, T.Krieger, P.von Krogh, J.Kyberd, P.Lafferty, G. D.Lafoux, H.Lahmann, R.Lai, W. P.Lanske, D.Lauber, J.Layter, J. G.Lee, A. M.Lefebvre, E.Lellouch, D.Letts, J.Levinson, L.Lloyd, S. L.Loebinger, F. K.Long, G. D.Lorazo, B.Losty, M. J.Lou, X. C.Ludwig, J.Luig, A.Malik, A.Mannelli, M.Marcellini, S.Markus, C.Martin, A. J.Martin, J. P.Mashimo, T.Matthews, W.Mättig, P.McKenna, J.Mckigney, E. A.McMahon, T. J.McNab, A. I.Meijers, F.Menke, S.Merritt, F. S.Mes, H.Michelini, A.Mikenberg, G.Miller, D. J.Mir, R.Mohr, W.Montanari, A.Mori, T.Morii, M.Müller, U.Nellen, B.Nijjhar, B.O'Neale, S. W.Oakham, F. G.Odorici, F.Ogren, H. O.Oldershaw, N. J.Oram, C. J.Oreglia, M. J.Orito, S.Palmonari, F.Pansart, J. P.Patrick, G. N.Pearce, M. J.Phillips, P. D.Pilcher, J. E.Pinfold, J.Plane, D. E.Poffenberger, P.Poli, B.Posthaus, A.Pritchard, T. W.Przysiezniak, H.Redmond, M. W.Rees, D. L.Rigby, D.Rison, M. G.Robins, S. A.Rodning, N.Roney, J. M.Ros, E.Rossi, A. M.Rosvick, M.Routenburg, P.Rozen, Y.Runge, K.Runolfsson, O.Rust, D. R.Sasaki, M.Sbarra, C.Schaile, A. D.Schaile, O.Scharf, F.Scharff-Hansen, P.Schenk, P.Schmitt, B.Schröder, M.Schultz-Coulon, H. C.Schütz, P.Schulz, M.Schwiening, J.Scott, W. G.Settles, M.Shears, T. G.Shen, B. C.Shepherd-Themistocleous, C. H.Sherwood, P.Siroli, G. P.Skillman, A.Skuja, A.Smith, A. M.Smith, T. J.Snow, G. A.Sobie, R.Söldner-Rembold, S.Springer, R. W.Sproston, M.Stahl, A.Starks, M.Stegmann, C.Stephens, K.Steuerer, J.Stockhausen, B.Strom, D.Szymanski, P.Tafirout, R.Taras, P.Tarem, S.Tecchio, M.Teixeira-Dias, P.Tesch, N.Thomson, M. A.von Törne, E.Towers, S.Tscheulin, M.Tsukamoto, T.Turcot, A. S.Turner-Watson, M. F.Utzat, P.Van Kooten, R.Vasseur, G.Vikas, P.Vincter, M.Wäckerle, F.Wagner, A.Wagner, D. L.Ward, C. P.Ward, D. R.Ward, J. J.Watkins, P. M.Watson, A. T.Watson, N. K.Weber, P.Wells, P. S.Wermes, N.Wilkens, B.Wilson, G. W.Wilson, J. A.Wlodek, T.Wolf, G.Wotton, S.Wyatt, T. R.Yekutieli, G.Zacek, V.Zeuner, W.Zorn, G. T.OPAL Collaboration
Source
Zeitschrift für Physik C Particles and Fields. December 1995 67(4):555-563
Subject
Language
English
ISSN
0170-9739
1431-5858
Abstract
We have searched for lepton flavour violating Z0→eμ, Z0→eτ and Z0→μτ decays in a sample of 4.0×106 visible Z0 decays collected with the OPAL detector at LEP during 1991 to 1994. No candidates are found for Z0→eμ. The samples of selected Z0→eτ and Z0→μτ candidates are consistent with the expected background. The following limits are set at 95% confidence level:$$\begin{gathered} BR(Z^0 \to e\mu ){\text{ }}< {\text{ 1}}{\text{.7 }} \times {\text{ 10}}^{ - {\text{6}}} \hfill \\ BR(Z^0 \to e\tau ){\text{ }}< {\text{ 9}}{\text{.8 }} \times {\text{ 10}}^{ - {\text{6}}} \hfill \\ BR(Z^0 \to \mu \tau ){\text{ }}< {\text{ 17}}{\text{. }} \times {\text{ 10}}^{ - {\text{6}}} . \hfill \\ \end{gathered}$$