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    • 169; the OPAL Collaboration

    semanticscholar

    Cited 0|Views6
    Abstract
    This paper presents updated measurements of the lifetimes of the Bs meson and the Λb baryon using 4.4 million hadronic Z 0 decays recorded by the OPAL detector at LEP from 1990 to 1995. A sample of Bs decays is obtained using D − s l + combinations, where the D−s is fully reconstructed in the φπ −, K∗0K− and KKS decay channels and partially reconstructed in the φl−ν̄X decay mode. A sample of Λb decays is obtained using Λc l − combinations, where the Λc is fully reconstructed in its decay to a pK −π+ final state and partially reconstructed in the Λl+νX decay channel. From 172 ± 28 D−s l + combinations attributed to Bs decays, the measured lifetime is τ(Bs ) = 1.50 +0.16 −0.15 ± 0.04 ps, where the errors are statistical and systematic, respectively. From the 129 ± 25 Λc l − combinations attributed to Λb decays, the measured lifetime is τ(Λb) = 1.29 +0.24 −0.22 ± 0.06 ps, where the errors are statistical and systematic, respectively. (Submitted to Physics Letters) The OPAL Collaboration K.Ackerstaff8, G.Alexander23, J. Allison16, N. Altekamp5, K.J. Anderson9, S.Anderson12, S.Arcelli2, S.Asai24, S.F. Ashby1, D.Axen29, G. Azuelos18,a, A.H. Ball17, E. Barberio8, R.J. Barlow16, R. Bartoldus3, J.R.Batley5, S. Baumann3, J. Bechtluft14, C.Beeston16, T.Behnke8, A.N. Bell1, K.W.Bell20, G. Bella23, S. Bentvelsen8, S. Bethke14, S. Betts15, O.Biebel14, A.Biguzzi5, S.D.Bird16, V. Blobel27, I.J. Bloodworth1, J.E. Bloomer1, M.Bobinski10, P. Bock11, D. Bonacorsi2, M.Boutemeur34, S. Braibant8, L. Brigliadori2, R.M.Brown20, H.J. Burckhart8, C.Burgard8, R. Bürgin10, P.Capiluppi2, R.K. Carnegie6, A.A. Carter13, J.R.Carter5, C.Y. Chang17, D.G. Charlton1,b, D. Chrisman4, P.E.L. Clarke15, I. Cohen23, J.E. Conboy15, O.C.Cooke8, C.Couyoumtzelis13, R.L. Coxe9, M. Cuffiani2, S.Dado22, C.Dallapiccola17 , G.M.Dallavalle2 , R.Davis30, S.De Jong12, L.A. del Pozo4, K.Desch3, B.Dienes33,d, M.S. Dixit7, M.Doucet18, E.Duchovni26, G.Duckeck34, I.P.Duerdoth16, D. Eatough16, J.E.G. Edwards16, P.G. Estabrooks6, H.G. Evans9, M.Evans13, F. Fabbri2, A. Fanfani2, M. Fanti2, A.A. Faust30, L. Feld8, F. Fiedler27, M.Fierro2, H.M. Fischer3, I. Fleck8, R. Folman26, D.G. Fong17, M. Foucher17, A. Fürtjes8, D.I. Futyan16, P.Gagnon7, J.W.Gary4, J.Gascon18, S.M.Gascon-Shotkin17, N.I.Geddes20, C.Geich-Gimbel3, T.Geralis20, G.Giacomelli2, P.Giacomelli4 , R.Giacomelli2 , V.Gibson5, W.R.Gibson13, D.M.Gingrich30,a, D.Glenzinski9, J. Goldberg22, M.J. Goodrick5, W.Gorn4, C.Grandi2, E.Gross26, J. Grunhaus23, M.Gruwé8, C.Hajdu32, G.G.Hanson12, M.Hansroul8, M.Hapke13, C.K.Hargrove7, P.A.Hart9, C.Hartmann3, M.Hauschild8, C.M.Hawkes5, R. Hawkings27, R.J.Hemingway6, M.Herndon17, G.Herten10, R.D.Heuer8, M.D. Hildreth8, J.C.Hill5, S.J.Hillier1, P.R.Hobson25, A. Hocker9, R.J.Homer1, A.K.Honma28,a, D. Horváth32,c, K.R.Hossain30, R. Howard29, P.Hüntemeyer27, D.E. Hutchcroft5, P. Igo-Kemenes11, D.C. Imrie25, M.R. Ingram16, K. Ishii24, A. Jawahery17, P.W. Jeffreys20, H. Jeremie18, M. Jimack1, A. Joly18, C.R. Jones5, G. Jones16, M. Jones6, U. Jost11, P. Jovanovic1, T.R. Junk8, J. Kanzaki24, D.Karlen6, V.Kartvelishvili16, K.Kawagoe24, T.Kawamoto24, P.I. Kayal30, R.K.Keeler28, R.G.Kellogg17, B.W.Kennedy20, J.Kirk29, A.Klier26, S.Kluth8, T.Kobayashi24, M.Kobel10, D.S. Koetke6, T.P.Kokott3, M.Kolrep10, S.Komamiya24, T.Kress11, P. Krieger6, J. von Krogh11, P. Kyberd13, G.D. Lafferty16, R. Lahmann17, W.P. Lai19, D. Lanske14, J. Lauber15, S.R. Lautenschlager31, J.G. Layter4, D. Lazic22, A.M. Lee31, E. Lefebvre18, D. Lellouch26, J. Letts12, L. Levinson26, S.L. Lloyd13, F.K. Loebinger16, G.D. Long28, M.J. Losty7, J. Ludwig10, D. Lui12, A.Macchiolo2, A.Macpherson30, M.Mannelli8, S.Marcellini2, C.Markopoulos13, C.Markus3, A.J.Martin13, J.P.Martin18, G.Martinez17, T.Mashimo24, P.Mättig26, W.J.McDonald30, J.McKenna29, E.A.Mckigney15, T.J.McMahon1, R.A.McPherson8, F.Meijers8, S.Menke3, F.S.Merritt9, H.Mes7, J.Meyer27, A.Michelini2, G.Mikenberg26, D.J.Miller15, A.Mincer22,e, R.Mir26, W.Mohr10, A.Montanari2, T.Mori24, U.Müller3, S.Mihara24, K.Nagai26, I. Nakamura24, H.A.Neal8, B. Nellen3, R.Nisius8, S.W.O’Neale1, F.G. Oakham7, F.Odorici2, H.O.Ogren12, A.Oh27, N.J. Oldershaw16, M.J.Oreglia9, S.Orito24, J. Pálinkás33,d, G. Pásztor32, J.R. Pater16, G.N. Patrick20, J. Patt10, R. Perez-Ochoa8, S. Petzold27, P. Pfeifenschneider14, J.E. Pilcher9, J. Pinfold30, D.E. Plane8, P. Poffenberger28, B. Poli2, A. Posthaus3, C.Rembser8, S. Robertson28, S.A. Robins22, N.Rodning30, J.M.Roney28, A.Rooke15, A.M.Rossi2, P. Routenburg30, Y. Rozen22, K.Runge10, O.Runolfsson8, U. Ruppel14, D.R. Rust12, R.Rylko25, K. Sachs10, T. Saeki24, W.M. Sang25, E.K.G. Sarkisyan23, C. Sbarra29, A.D. Schaile34, O. Schaile34, F. Scharf3, P. Scharff-Hansen8, J. Schieck11, P. Schleper11, B. Schmitt8, S. Schmitt11, A. Schöning8, M. Schröder8, H.C. Schultz-Coulon10, M. Schumacher3, C. Schwick8, W.G. Scott20, T.G. Shears16, B.C. Shen4, C.H. Shepherd-Themistocleous8, P. Sherwood15, G.P. Siroli2, A. Sittler27, A. Skillman15, A. Skuja17, A.M. Smith8, G.A. Snow17, R. Sobie28, S. Söldner-Rembold10, R.W. Springer30, M. Sproston20, K. Stephens16, J. Steuerer27, B. Stockhausen3, K. Stoll10, D. Strom19, R. Ströhmer34, P. Szymanski20, R.Tafirout18, S.D.Talbot1, S. Tanaka24, P. Taras18, S. Tarem22, R. Teuscher8, M.Thiergen10, M.A. Thomson8, E. von Törne3, E.Torrence8, S. Towers6, I. Trigger18, Z. Trócsányi33, E.Tsur23, A.S. Turcot9, M.F. Turner-Watson8, P. Utzat11, i R.Van Kooten12, M.Verzocchi10, P.Vikas18, E.H.Vokurka16, H.Voss3, F.Wäckerle10 , A.Wagner27, C.P.Ward5, D.R.Ward5, P.M.Watkins1, A.T.Watson1, N.K.Watson1, P.S.Wells8, N.Wermes3, J.S.White28, B.Wilkens10, G.W.Wilson27, J.A.Wilson1, T.R.Wyatt16, S.Yamashita24, G. Yekutieli26, V. Zacek18, D. Zer-Zion8 1School of Physics and Astronomy, University of Birmingham, Birmingham B15 2TT, UK 2Dipartimento di Fisica dell’ Università di Bologna and INFN, I-40126 Bologna, Italy 3Physikalisches Institut, Universität Bonn, D-53115 Bonn, Germany 4Department of Physics, University of California, Riverside CA 92521, USA 5Cavendish Laboratory, Cambridge CB3 0HE, UK 6Ottawa-Carleton Institute for Physics, Department of Physics, Carleton University, Ottawa, Ontario K1S 5B6, Canada 7Centre for Research in Particle Physics, Carleton University, Ottawa, Ontario K1S 5B6, Canada 8CERN, European Organisation for Particle Physics, CH-1211 Geneva 23, Switzerland 9Enrico Fermi Institute and Department of Physics, University of Chicago, Chicago IL 60637, USA 10Fakultät für Physik, Albert Ludwigs Universität, D-79104 Freiburg, Germany 11Physikalisches Institut, Universität Heidelberg, D-69120 Heidelberg, Germany 12Indiana University, Department of Physics, Swain Hall West 117, Bloomington IN 47405, USA 13Queen Mary and Westfield College, University of London, London E1 4NS, UK 14Technische Hochschule Aachen, III Physikalisches Institut, Sommerfeldstrasse 26-28, D-52056 Aachen, Germany 15University College London, London WC1E 6BT, UK 16Department of Physics, Schuster Laboratory, The University, Manchester M13 9PL, UK 17Department of Physics, University of Maryland, College Park, MD 20742, USA 18Laboratoire de Physique Nucléaire, Université de Montréal, Montréal, Quebec H3C 3J7, Canada 19University of Oregon, Department of Physics, Eugene OR 97403, USA 20Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire OX11 0QX, UK 22Department of Physics, Technion-Israel Institute of Technology, Haifa 32000, Israel 23Department of Physics and Astronomy, Tel Aviv University, Tel Aviv 69978, Israel 24International Centre for Elementary Particle Physics and Department of Physics, University of Tokyo, Tokyo 113, and Kobe University, Kobe 657, Japan 25Brunel University, Uxbridge, Middlesex UB8 3PH, UK 26Particle Physics Department, Weizmann Institute of Science, Rehovot 76100, Israel 27Universität Hamburg/DESY, II Institut für Experimental Physik, Notkestrasse 85, D-22607 Hamburg, Germany 28University of Victoria, Department of Physics, P O Box 3055, Victoria BC V8W 3P6, Canada 29University of British Columbia, Department of Physics, Vancouver BC V6T 1Z1, Canada 30University of Alberta, Department of Physics, Edmonton AB T6G 2J1, Canada 31Duke University, Dept of Physics, Durham, NC 27708-0305, USA 32Research Institute for Particle and Nuclear Physics, H-1525 Budapest, P O Box 49, Hungary 33Institute of Nuclear Research, H-4001 Debrecen, P O Box 51, Hungary 34Ludwigs-Maximilians-Universität München, Sektion Physik, Am Coulombwall 1, D-85748 Garching, Germany a and at TRIUMF, Vancouver, Canada V6T 2A3 b and Royal Society University Research Fellow c and Institute of Nuclear Research, Debrecen, Hungary d and Department of Experimental Physics, Lajos Kossuth University, Debrecen, Hungary e and Department of Physics, New York University, NY 1003, USA
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    【要点】：本文通过OPAL探测器在LEP收集的4.4百万个强子Z^0衰变数据，更新测量了Bs介子和Λb重子的寿命，Bs介子的寿命为1.50±0.16±0.04 ps，Λb重子的寿命为1.29±0.24±0.06 ps，提高了测量的精确度。
    

    【方法】：研究利用D−s l +组合获取Bs介子样本，D−s通过φπ−、K^*0K−和KKS衰变通道完全重建，通过φl−ν̄X衰变模式部分重建；利用Λc l −组合获取Λb重子样本，Λc通过pK−π+最终态完全重建，通过Λl+νX衰变通道部分重建。
    

    【实验】：实验使用了OPAL探测器在LEP从1990到1995年间收集的4.4百万个强子Z^0衰变数据。通过上述方法，得到了172±28个Bs介子衰变事例和129±25个Λb重子衰变事例，据此计算得到了两者的寿命。