An improved measurement of the B0 lifetime

R. Akers, G. Alexander, J. Allison, K. Ametewwe,K.J. Anderson, S. Arcelli, S. Asai, D. Axen, G. Azuelos,A.H. Ball, E. Barberio,R.J. Barlow, R. Bartoldus, J.R. Batley, G. Beaudoin, A. Beck, G.A. Bekc, C. Beeston, T. Behnke,K.W. Bell, G. Bella, S. Bentvelsen, P. Berlich, S. Bethke, O. Biebel, I.J. Bloodworth, P. Bock, H.M. Bosch, M. Boutemeur, S. Braibant, P. Bright-Thomas,R.M. Brown, A. Buijs, H.J. Burckhart, R. Bürgin, C. Burgard, N. Capdevielle, P. Capiluppi,R.K. Carnegie,A.A. Carter,J.R. Carter,C.Y. Chang, C. Charlesworth, D.G. Charlton, S.L. Chu, P.E.L. Clarke, J.C. Clayton, S.G. Clowes, I. Cohen,J.E. Conboy, O.C. Cooke, M. Cuffiani, S. Dado, C. Dallapiccola,G.M. Dallavalle, C. Darling,S. De Jong,L.A. del Pozo, H. Deng, M. Dittmar,M.S. Dixit,E. do Couto e Silva,J.E. Duboscq, E. Duchovni, G. Duckeck,I.P. Duerdoth,U.C. Dunwoody, J.E.G. Edwards, P.A. Elcombe, P.G. Estabrooks, E. Etzion, H.G. Evans, F. Fabbri,B. Fabbro, M. Fanti, P. Fath, M. Fierro,M. Fincke-Keeler,H.M. Fischer, P. Fischer, R. Folman, D.G. Fong, M. Foucher, H. Fukui, A. Fürtjes, P. Gagnon, A. Gaidot,J.W. Gary, J. Gascon,N.I. Geddes,C. Geich-Gimbel, S.W. Gensler,F.X. Gentit, T. Geralis, G. Giacomelli,P. Giacomelli, R. Giacomelli, V. Gibson,W.R. Gibson, J.D. Gillies, J. Goldberg, D.M. Gingrich, M.J. Goodrick, W. Gorn, C. Grandi, E. Gross, J. Hagemann, G.G. Hanson, M. Hansroul, C.K. Hargrove, P.A. Hart, M. Hauschild, C.M. Hawkes, E. Heflin, R.J. Hemingway, G. Herten, R.D. Heuer, J.C. Hill, S.J. Hillier, T. Hilse, P.R. Hobson, D. Hochman, R.J. Homer, A.K. Honma, R. Howard, R.E. Hughes-Jones, P. Igo-Kemenes, D.C. Imrie, A. Jawahery, P.W. Jeffreys, H. Jeremie, M. Jimack, M. Jones, R.W.L. Jones, P. Jovanovic, C. Jui, D. Karlen, J. Kanzaki, K. Kawagoe, T. Kawamoto, R.K. Keeler, R.G. Kellogg, B.W. Kennedy, B. King, J. King, J. Kirk, S. Kluth, T. Kobayashi, M. Kobel, D.S. Koetke, T.P. Kokott, S. Komamiya, R. Kowalewski, T. Kress, P. Krieger,J. von Krogh, P. Kyberd, G.D. Lafferty, H. Lafoux, R. Lahmann, W.P. Lai, J. Lauber, J.G. Layter, P. Leblanc, A.M. Lee, E. Lefebvre, D. Lellouch, C. Leroy, J. Letts, L. Levinson, S.L. Lloyd, F.K. Loebinger, G.D. Long, B. Lorazo, M.J. Losty, X.C. Lou, J. Ludwig, A. Luig, M. Mannelli, S. Marcellini, C. Markus, A.J. Martin, J.P. Martin, T. Mashimo, W. Matthews, P. Mättig, U. Maur, J. McKenna, T.J. McMahon, A.I. McNab, F. Meijers, F.S. Merritt, H. Mes, A. Michelini, R.P. Middleton, G. Mikenberg, D.J. Miller, R. Mir, W. Mohr, A. Montanari, T. Mori,M. Morii, U. Müller, B. Nellen, B. Nijjhar, S.W. O'Neale, F.G. Oakham, F. Odorici, H.O. Orgen, N.J. Oldershaw, C.J. Oram, M.J. Oreglia, S. Orito, F. Palmonari, J.P. Pansart, G.N. Patrick, M.J. Pearce, P.D. Phillips, J.E. Pilcher, J. Pinfold, D.E. Plane, P. Poffenberger, B. Poli, A. Posthaus, T.W. Pritchard, H. Przysiezniak, M.W. Redmond, D.L. Rees, D. Rigby, M.G. Rison, S.A. Robins, D. Robinson, N. Rodning, J.M. Roney, E. Ros, A.M. Rossi, M. Rosvick, P. Routenburg, Y. Rozen, K. Runge, O. Runolfsson, D.R. Rust, M. Sasaki, C. Sbarra, A.D. Schaile, O. Schaile, F. Scharf, P. Scharff-Hansen, P. Schenk, B. Schmitt, M. Schröder, H.C. Schultz-Coulon, P. Schütz, M. Schulz, C. Schwick, J. Schwiening, W.G. Scott, M. Settles, T.G. Shears, B.C. Shen, C.H. Shepherd-Themistocleous, P. Sherwood, G.P. Siroli, A. Skillman, A. Skuja, A.M. Smith, T.J. Smith, G.A. Snow, R. Sobie, S. Söldner-Rembold, R.W. Springer, M. Sproston, A. Stahl, M. Starks, C. Stegmann, K. Stephens, J. Steuerer, B. Stockhausen, D. Strom, P. Szymanski, R. Tafirout, H. Takeda, T. Takeshita, P. Taras, S. Tarem, M. Tecchio, P. Teixeira-Dias, N. Tesch, M.A. Thomson, O. Tousignant, S. Towers, M. Tscheulin, T. Tsukamoto, A.S. Turcot, M.F. Turner-Watson, P. Utzat,R. Van Kooten, G. Vasseur, P. Vikas, M. Vincter, A. Wagner, D.L. Wagner, C.P. Ward, D.R. Ward, J.J. Ward, P.M. Watkins, A.T. Watson, N.K. Watson, P. Weber, P.S. Wells, N. Wermes, B. Wilkens, G.W. Wilson, J.A. Wilson,V-H. Winterer, T. Wlodek, G. Wolf, S. Wotton, T.R. Wyatt, A. Yeaman, G. Yekutieli, M. Yurko, V. Zacek, W. Zeuner, G.T. Zorn

Physics Letters B（1995）

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摘要

This letter presents an updated measurement of the lifetime of the B s 0 meson using 3.6 million hadronic Z 0 decays recorded by the OPAL detector at LEP from 1990 to 1994. A sample of B s 0 decays is obtained using D s − l + combinations, where the D s − is reconstructed in either the φπ − or K ∗0 K − decay mode. From 79 ± 13 D x l combinations attributed to B s 0 decays in this data sample, we measure τ (B s 0 ) = 1.54 −0.21 +0.25 ± 0.06 ps, where the errors are statistical and systematic, respectively.

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lifetime,improved measurement

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