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CERN Document Server 2,046 のレコードが見つかりました。  1 - 10次最後  レコードへジャンプ： 検索にかかった時間： 1.67 秒 
1.
(100)
Measurement of the $B^{+}$ and $B^{0}$ lifetimes and search for CP(T) violation using reconstructed secondary vertices / OPAL Collaboration
The lifetimes of the B+ and B0 mesons, and their ratio, have been measured in the OPAL experiment using 2.4 million hadronic Z0 decays recorded at LEP. Z0 -> b bbar decays were tagged using displaced secondary vertices and high momentum electrons and muons [...]
hep-ex/9901017; CERN-EP-98-195; CERN-EP-98-195.- Geneva : CERN, 2000 - 32 p. - Published in : Eur. Phys. J. C 12 (2000) 609-626 Fulltext: 9901017 - PDF; arXiv:hep-ex_9901017 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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2.
(91)
A study of B meson oscillations using hadronic $Z^0$ decays containing leptons / OPAL Collaboration
An event sample enriched in semileptonic decays of b hadrons is selected using an inclusive lepton selection from approximately 3.0 million hadronic Z^0 decays collected with the OPAL detector. This sample is used to investigate B meson oscillations by reconstructing a proper decay time for the parent of each lepton, using a jet charge method to estimate the production flavour of this parent, and using the lepton charge to tag the decay flavour. [...]
hep-ex/9707009; CERN-PPE-97-036; CERN-PPE-97-36; CERN-PPE-97-036.- Geneva : CERN, 1997 - 36 p. - Published in : Z. Phys. C 76 (1997) 401-415 Fulltext: arXiv:hep-ex_9707009 - PDF; 9707009 - PDF; External link: hep-ex/9707009 PDF - Please contact the library if you need to access this document.
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3.
(82)
Measurement of the $B^0$ Lifetime and Oscillation Frequency using $\overline{B}^{0} \to D^{*+}l^{-}\overline{\nu}$ decays / OPAL Collaboration
The lifetime and oscillation frequency of the B0 meson has been measured using B0->D*+l-v decays recorded on the Z0 peak with the OPAL detector at LEP. The D*+ -> D0pi+ decays were reconstructed using an inclusive technique and the production flavour of the B0 mesons was determined using a combination of tags from the rest of the event. [...]
hep-ex/0010013; CERN-EP-2000-090; CERN-EP-2000-90; CERN-EP-2000-090.- Geneva : CERN, 2000 - 18 p. - Published in : Phys. Lett. B 493 (2000) 266 Fulltext: 0010013 - PDF; arXiv:hep-ex_0010013 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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4.
(73)
A measurement of the $\tau^{-} \to e^{-} \overline{\nu}_{e}\nu_{\tau}$ branching ratio / OPAL Collaboration
The branching ratio for the decay tau->e nue nutau has been measured using Z0 decay data collected by the OPAL experiment at LEP. In total 33073 tau->e nue nutau candidates were identified from a sample of 186197 selected tau decays, giving a branching ratio of 17.81 +- 0.09(stat) +_ 0.06(sys)%. [...]
hep-ex/9812017; CERN-EP-98-175; CERN-EP-98-175.- Geneva : CERN, 1999 - 17 p. - Published in : Phys. Lett. B 447 (1999) 134-146 Fulltext: arXiv:hep-ex_9812017 - PDF; 9812017 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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5.
(73)
A Study of One-Prong Tau Decays with a Charged Kaon / OPAL Collaboration
From an analysis of the ionisation energy loss of charged particles selected from 110326 e+e- -> tau+tau- candidates recorded by the OPAL detector at e+e- centre-of-mass energies near the Z0 resonance, we determine the one-prong tau decay branching ratios: Br(tau- -> nu_tau K- >=0h0) = 1.528 +- 0.039 +- 0.040 % Br(tau- -> nu_tau K-) = 0.658 +- 0.024 +- 0.029 % where the h0 notation refers to a pi0, an eta, a K^0_S, or a K^0_L, and where the first uncertainty is statistical and the second is systematic..
hep-ex/0009017; CERN-EP-2000-091; OPAL-PR-315; CERN-EP-2000-091.- Geneva : CERN, 2001 - 31 p. - Published in : Eur. Phys. J. C 19 (2001) 653-665 Fulltext: 0009017 - PDF; arXiv:hep-ex_0009017 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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6.
(72)
A Precise Measurement of the $B^{+}, B^{0}$ and Mean b-hadron Lifetime with the DELPHI Detector at LEP I / DELPHI Collaboration
Final results from the DELPHI Collaboration on the lifetime of B+ and B0 mesons and the mean b-hadron lifetime, are presented using the data collected at the Z0 peak in 1994 and 1995. Elaborate, inclusive, secondary vertexing methods have been employed to ensure a b-hadron reconstruction with good efficiency. [...]
hep-ex/0401025; CERN-EP-2003-065; CERN-EP-2003-065.- Geneva : CERN, 2004 - 30 p. - Published in : Eur. Phys. J. C 33 (2004) 307-324 Fulltext: arXiv:hep-ex_0401025 - PDF; 0401025 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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7.
(72)
Measurement of the $B^0_s$ Lifetime and Study of $B^0_s - \overline{B^0_s}$ Oscillations using $D_{s}l$ Events / DELPHI Collaboration
Lifetime and oscillations of $\Bs$ mesons have been studied in eventswith a large transverse momentum lepton and a $\Ds$ of opposite electric charge>the same hemisphere, selected from about 3.6 million hadronic $\Zz$decays accumulated by DELPHI between 1992 and 1995. \\The $\Bs$ lifetime and the fractional width difference between the two physical>
hep-ex/0107077; CERN-EP-2000-043; CERN-EP-2000-043.- Geneva : CERN, 2000 - 47 p. - Published in : Eur. Phys. J. C 16 (2000) 555-578 Fulltext: ep-2000-043 - PDF; arXiv:hep-ex_0107077 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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8.
(71)
A measurement of the $\tau$ mass and the first CPT test with $\tau$ leptons / OPAL Collaboration
We measure the mass of the tau lepton to be 1775.1+-1.6(stat)+-1.0(sys t.) MeV using tau pairs from Z0 decays. To test CPT invariance we compare the masses of the positively and negatively charged tau leptons. [...]
hep-ex/0005009; CERN-EP-2000-056; CERN-EP-2000-056.- Geneva : CERN, 2000 - 13 p. - Published in : Phys. Lett. B 492 (2000) 23-31 Fulltext: arXiv:hep-ex_0005009 - PDF; 0005009 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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9.
(68)
Investigation of CP violation in $B^{0} \to J/\psi K_{s}^{0}$ decays at LEP / OPAL Collaboration
An investigation of CP violation was performed using a total of 24 candidates for B^0 -> J/psi K^0_S decay, with a purity of about 60%. These events were selected from 4.4 million hadronic Z^0 decays recorded by the OPAL detector at LEP. [...]
hep-ex/9801022; CERN-EP-98-001; CERN-EP-98-001.- Geneva : CERN, 1998 - 20 p. - Published in : Eur. Phys. J. C 5 (1998) 379-388 Fulltext: ep-98-001 - PDF; arXiv:hep-ex_9801022 - PDF; 9801022 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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10.
(68)
A Study of Three-Prong $\tau$ Decays with Charged Kaons / OPAL Collaboration
From an analysis of the ionisation energy loss of charged particles selected from a sample of 147926 e+e- -> tau+tau- candidates recorded in the OPAL detector at e+e- centre-of-mass energies near the Z0 resonance, we determine the branching ratios: BR(tau- -> nu_tau K- pi- pi+ (pi0)) = 0.343 +- 0.073 +- 0.031 % BR(tau- -> nu_tau K- pi- K+ (pi0)) = 0.159 +- 0.053 +- 0.020 % where the (pi0) notation refers to decay modes with or without an accompanying pizero. The tau- -> nu_tau K- pi- pi+ (pi0) final states occurring through tau- -> nu_tau K- K_s (pi0) are treated as background in this analysis. [...]
hep-ex/9908013; CERN-EP-99-095; CERN-EP-99-095.- Geneva : CERN, 2000 - 38 p. - Published in : Eur. Phys. J. C 13 (2000) 197-212 Fulltext: arXiv:hep-ex_9908013 - PDF; 9908013 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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