Phys. Rev. Lett.
94,
102001
(2005)
[7 pages]
Measurement of the Λb0 Lifetime in the Decay Λb0→J/ψΛ0 with the D0 Detector
V. M. Abazov et al. D0 Collaboration
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V. M. Abazov33, B. Abbott70, M. Abolins61, B. S. Acharya27, M. Adams48, T. Adams46, M. Agelou17, J. -L. Agram18, S. H. Ahn29, M. Ahsan55, G. D. Alexeev33, G. Alkhazov37, A. Alton60, G. Alverson59, G. A. Alves2, M. Anastasoaie32, S. Anderson42, B. Andrieu16, Y. Arnoud13, A. Askew74, B. Åsman38, O. Atramentov53, C. Autermann20, C. Avila7, F. Badaud12, A. Baden57, B. Baldin47, P. W. Balm31, S. Banerjee27, E. Barberis59, P. Bargassa74, P. Baringer54, C. Barnes40, J. Barreto2, J. F. Bartlett47, U. Bassler16, D. Bauer51, A. Bean54, S. Beauceron16, M. Begel66, A. Bellavance63, S. B. Beri26, G. Bernardi16, R. Bernhard47,*, I. Bertram39, M. Besançon17, R. Beuselinck40, V. A. Bezzubov36, P. C. Bhat47, V. Bhatnagar26, M. Binder24, K. M. Black58, I. Blackler40, G. Blazey49, F. Blekman31, S. Blessing46, D. Bloch18, U. Blumenschein22, A. Boehnlein47, O. Boeriu52, T. A. Bolton55, F. Borcherding47, G. Borissov39, K. Bos31, T. Bose65, A. Brandt72, R. Brock61, G. Brooijmans65, A. Bross47, N. J. 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Verdier15, L. S. Vertogradov33, M. Verzocchi57, F. Villeneuve-Seguier40, J. -R. Vlimant16, E. Von Toerne55, M. Vreeswijk31, T. Vu Anh15, H. D. Wahl46, R. Walker40, L. Wang57, Z. -M. Wang67, J. Warchol52, M. Warsinsky21, G. Watts76, M. Wayne52, M. Weber47, H. Weerts61, M. Wegner20, N. Wermes21, A. White72, V. White47, D. Whiteson43, D. Wicke47, D. A. Wijngaarden32, G. W. Wilson54, S. J. Wimpenny45, J. Wittlin58, M. Wobisch47, J. Womersley47, D. R. Wood59, T. R. Wyatt41, Q. Xu60, N. Xuan52, R. Yamada47, M. Yan57, T. Yasuda47, Y. A. Yatsunenko33, Y. Yen25, K. Yip68, S. W. Youn50, J. Yu72, A. Yurkewicz61, A. Zabi15, A. Zatserklyaniy49, M. Zdrazil67, C. Zeitnitz23, D. Zhang47, X. Zhang70, T. Zhao76, Z. Zhao60, B. Zhou60, J. Zhu57, M. Zielinski66, D. Zieminska51, A. Zieminski51, R. Zitoun67, V. Zutshi49, E. G. Zverev35, and A. Zylberstejn17 (D0 Collaboration)
1Universidad de Buenos Aires, Buenos Aires, Argentina
2LAFEX, Centro Brasileiro de Pesquisas Físicas, Rio de Janeiro, Brazil
3Universidade do Estado do Rio de Janeiro, Rio de Janeiro, Brazil
4Instituto de Física Teórica, Universidade Estadual Paulista, São Paulo, Brazil
5Simon Fraser University, Burnaby, Canada, University of Alberta, Edmonton, Canada, McGill University, Montreal, Canada and York University, Toronto, Canada
6Institute of High Energy Physics, Beijing, People’s Republic of China
7Universidad de los Andes, Bogotá, Colombia
8Center for Particle Physics, Charles University, Prague, Czech Republic
9Czech Technical University, Prague, Czech Republic
10Institute of Physics, Academy of Sciences, Center for Particle Physics, Prague, Czech Republic
11Universidad San Francisco de Quito, Quito, Ecuador
12Laboratoire de Physique Corpusculaire, IN2P3-CNRS, Université Blaise Pascal, Clermont-Ferrand, France
13Laboratoire de Physique Subatomique et de Cosmologie, IN2P3-CNRS, Universite de Grenoble 1, Grenoble, France
14CPPM, IN2P3-CNRS, Université de la Méditerranée, Marseille, France
15Laboratoire de l’Accélérateur Linéaire, IN2P3-CNRS, Orsay, France
16LPNHE, Universités Paris VI and VII, IN2P3-CNRS, Paris, France
17DAPNIA/Service de Physique des Particules, CEA, Saclay, France
18IReS, IN2P3-CNRS, Université Louis Pasteur, Strasbourg, France and Université de Haute Alsace, Mulhouse, France
19Institut de Physique Nucléaire de Lyon, IN2P3-CNRS, Université Claude Bernard, Villeurbanne, France
20RWTH Aachen, III. Physikalisches Institut A, Aachen, Germany
21Physikalisches Institut, Universität Bonn, Bonn, Germany
22Physikalisches Institut, Universität Freiburg, Freiburg, Germany
23Institut für Physik, Universität Mainz, Mainz, Germany
24Ludwig-Maximilians-Universität München, München, Germany
25Fachbereich Physik, University of Wuppertal, Wuppertal, Germany
26Panjab University, Chandigarh, India
27Tata Institute of Fundamental Research, Mumbai, India
28University College Dublin, Dublin, Ireland
29Korea Detector Laboratory, Korea University, Seoul, Korea
30CINVESTAV, Mexico City, Mexico
31FOM-Institute NIKHEF and University of Amsterdam/NIKHEF, Amsterdam, The Netherlands
32University of Nijmegen/NIKHEF, Nijmegen, The Netherlands
33Joint Institute for Nuclear Research, Dubna, Russia
34Institute for Theoretical and Experimental Physics, Moscow, Russia
35Moscow State University, Moscow, Russia
36Institute for High Energy Physics, Protvino, Russia
37Petersburg Nuclear Physics Institute, St. Petersburg, Russia
38Lund University, Lund, Sweden, Royal Institute of Technology and Stockholm University, Stockholm, Sweden and Uppsala University, Uppsala, Sweden
39Lancaster University, Lancaster, United Kingdom
40Imperial College, London, United Kingdom
41University of Manchester, Manchester, United Kingdom
42University of Arizona, Tucson, Arizona 85721, USA
43Lawrence Berkeley National Laboratory and University of California, Berkeley, California 94720, USA
44California State University, Fresno, California 93740, USA
45University of California, Riverside, California 92521, USA
46Florida State University, Tallahassee, Florida 32306, USA
47Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA
48University of Illinois at Chicago, Chicago, Illinois 60607, USA
49Northern Illinois University, DeKalb, Illinois 60115, USA
50Northwestern University, Evanston, Illinois 60208, USA
51Indiana University, Bloomington, Indiana 47405, USA
52University of Notre Dame, Notre Dame, Indiana 46556, USA
53Iowa State University, Ames, Iowa 50011, USA
54University of Kansas, Lawrence, Kansas 66045, USA
55Kansas State University, Manhattan, Kansas 66506, USA
56Louisiana Tech University, Ruston, Louisiana 71272, USA
57University of Maryland, College Park, Maryland 20742, USA
58Boston University, Boston, Massachusetts 02215, USA
59Northeastern University, Boston, Massachusetts 02115, USA
60University of Michigan, Ann Arbor, Michigan 48109, USA
61Michigan State University, East Lansing, Michigan 48824, USA
62University of Mississippi, University, Mississippi 38677, USA
63University of Nebraska, Lincoln, Nebraska 68588, USA
64Princeton University, Princeton, New Jersey 08544, USA
65Columbia University, New York, New York 10027, USA
66University of Rochester, Rochester, New York 14627, USA
67State University of New York, Stony Brook, New York 11794, USA
68Brookhaven National Laboratory, Upton, New York 11973, USA
69Langston University, Langston, Oklahoma 73050, USA
70University of Oklahoma, Norman, Oklahoma 73019, USA
71Brown University, Providence, Rhode Island 02912, USA
72University of Texas, Arlington, Texas 76019, USA
73Southern Methodist University, Dallas, Texas 75275, USA
74Rice University, Houston, Texas 77005, USA
75University of Virginia, Charlottesville, Virginia 22901, USA
76University of Washington, Seattle, Washington 98195, USA
Received 21 October 2004; published 16 March 2005
We present measurements of the Λb0 lifetime in the exclusive decay channel Λb0→J/ψΛ0, with J/ψ→μ+μ- and Λ0→pπ-, the B0 lifetime in the decay B0→J/ψKS0 with J/ψ→μ+μ- and KS0→π+π-, and the ratio of these lifetimes. The analysis is based on approximately 250 pb-1 of data recorded with the D0 detector in pp̅ collisions at √s=1.96 TeV. The Λb0 lifetime is determined to be τ(Λb0)=1.22-0.18+0.22(stat)±0.04(syst) ps, the B0 lifetime τ(B0)=1.40-0.10+0.11(stat)±0.03(syst) ps, and the ratio τ(Λb0)/τ(B0)=0.87-0.14+0.17(stat)±0.03(syst). In contrast with previous measurements using semileptonic decays, this is the first determination of the Λb0 lifetime based on a fully reconstructed decay channel.
© 2005 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.94.102001
DOI:
10.1103/PhysRevLett.94.102001
PACS:
14.20.Mr, 13.25.Hw, 13.30.Eg, 14.40.Nd
*Visitor from University of Zurich, Zurich, Switzerland. †Visitor from Institute of Nuclear Physics, Krakow, Poland.
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