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CERN Document Server 2,040 records found  1 - 10próximoend  jump to record: Search took 1.33 seconds. 
1.
(100)
A Measurement of the Product Branching Ratio $f(b \to \Lambda_{b}).BR (\Lambda_{b} \to \Lambda X)$ in $Z^{0}$ Decays / OPAL Collaboration
The product branching ratio, f(b->Lambda_b).BR(Lambda_b->Lambda X), where Lambda_b denotes any weakly-decaying b-baryon, has been measured using the OPAL detector at LEP. Lambda_b are selected by the presence of energetic Lambda particles in bottom events tagged by the presence of displaced secondary vertices. [...]
hep-ex/9812018; CERN-EP-98-186; CERN-EP-98-186.- Geneva : CERN, 1999 - 17 p. - Published in : Eur. Phys. J. C 9 (1999) 1-9 Fulltext: 9812018 - PDF; arXiv:hep-ex_9812018 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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2.
(91)
Measurement of the $\overline{B} \to D^{(*)}\pi l\overline{\nu}_l$ Branching Fraction / DELPHI Collaboration
A study of $b$ semileptonic decays into $D$, $D\pi^{\pm}$ and $D^*\pi^{\pm}$ final states is presented.The $D^0$, $D^+$ and $D^{*+}$ mesons are exclusively reconstructed in $Z$ decay data recorded from 1992 to 1995in the DELPHI experiment at LEP. The overall branching fractions are measured to be: $BR(b -> D^0 \ell^- \bar{\nu}_{\ell} X) = (7.04 +/- 0.34 (stat) +/- 0.36 (syst.exp) +/- 0.17 (BR_D))\%,$ $BR(b -> D^+ \ell^- \bar{\nu}_{\ell} X) = (2.72 +/- 0.19 (stat) +/- 0.16 (syst.exp) +/- 0.18 (BR_D))\%$, $BR(b -> D^{*+} \ell^- \bar{\nu}_{\ell} X) = (2.75 +/- 0.17 (stat) +/- 0.13 (syst.exp) +/- 0.09 (BR_D))\%$ where the $D^0$ and $D^+$ results include also contributions from $D^{*0}$ and $D^{*+}$ decays..
hep-ex/0105052; CERN-EP-99-174; CERN-EP-99-174.- Geneva : CERN, 2000 - 25 p. - Published in : Phys. Lett. B 475 (2000) 407-28 Fulltext: ep-1999-174 - PDF; arXiv:hep-ex_0105052 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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3.
(91)
A Measurement of Semileptonic B Decays to Narrow Orbitally-Excited Charm Mesons / OPAL Collaboration
The decay chain b -> Bbar -> D^{**0} l nu X, D^{**0} -> D^{*+} pi^-, D^{*+} -> D^0 pi^+, D^0 ->(Kpi or K3pi) is identified in a sample of 3.9 million hadronic Z decays collected with the OPAL detector at LEP. The branching ratio BR (b -> Bbar) x BR (Bbar -> D^0_1 l nu X) x BR (D^0_1 -> D^{*+} pi^-) is measured to be (2.64 +- 0.79 (stat) +- 0.39 (syst)) X 10^-3 for the J^P = 1^+ (D^0_1) state. [...]
hep-ex/0301018; CERN-EP-2002-094; CERN-EP-2002-094.- Geneva : CERN, 2003 - 20 p. - Published in : Eur. Phys. J. C 30 (2003) 467-475 Fulltext: ep-2002-094 - PDF; arXiv:hep-ex_0301018 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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4.
(87)
Measurement of the one-prong hadronic $\tau$ branching ratios at LEP / OPAL Collaboration
The branching ratios of the \tau^- -> h^- \nu_\tau, \tau^- -> h^- \pi^0 \nu_\tau, \tau^- -> h^- >=2 \pi^0 \nu_\tau decays have been measured using the 1991-1995 data recorded with the OPAL detector at LEP. These branching ratios are measured simultaneously using three selection criteria and are found to be BR(\tau^- -> h^- \nu_\tau) = (11.98 +/- 0.13 +/- 0.16)% BR(\tau^- -> h^- \pi^0 \nu_\tau) = (25.89 +/- 0.17 +/- 0.29)% BR(\tau^- -> h^- >=2 \pi^0 \nu_\tau) = ( 9.91 +/- 0.31 +/- 0.27)% where the first error is statistical and the second is systematic..
hep-ex/9801029; CERN-PPE-97-152; CERN-PPE-97-152.- Geneva : CERN, 1998 - 23 p. - Published in : Eur. Phys. J. C 4 (1998) 193-206 Fulltext: arXiv:hep-ex_9801029 - PDF; 9801029 - PDF; ppe-97-152 - PDF; External link: hep-ex/9801029 PDF - Please contact the library if you need to access this document.
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5.
(86)
Measurement of the semileptonic b branching fractions and average b mixing parameter in Z decays / DELPHI Collaboration
The semileptonic branching fractions for primary and cascade b decays BR(b -> lepton-), BR(b -> c -> lepton+) and BR(b -> cbar -> lepton-) were measured in hadronic Z decays collected by the DELPHI experiment at LEP. The sample was enriched in b decays using the lifetime information and various techniques were used to separate leptons from direct or cascade b decays [...]
hep-ex/0105080; CERN-EP-2000-157; CERN-EP-2000-157.- Geneva : CERN, 2001 - 40 p. - Published in : Eur. Phys. J. C 20 (2001) 455-478 Fulltext: arXiv:hep-ex_0105080 - PDF; ep-2000-157 - PDF; External link: Preprint
In : 30th International Conference on High-energy Physics, Osaka, Japan, 27 Jul - 2 Aug 2000, pp.e-page 408 - Please contact the library if you need to access this document.
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6.
(85)
Measurement of Tau Branching Ratios to Five Charged Hadrons / OPAL Collaboration
The branching ratios of the decay of the tau lepton to five charged hadrons have been measured with the OPAL detector at LEP using data collected between 1991 and 1995 at e+e- centre-of-mass energies close to the Z resonance. The branching ratios are measured to be BR(tau- to 3h-2h+nutau) = 0.091+-0.014+-0.005% BR(tau- to 3h-2h+pi0nutau) = 0.027+-0.018+-0.007% where the first error is statistical and the second systematic..
hep-ex/9808011; CERN-EP-98-090; CERN-EP-98-90; CERN-EP-98-090.- Geneva : CERN, 1999 - 13 p. - Published in : Eur. Phys. J. C 8 (1999) 183-9 Fulltext: 9808011 - PDF; arXiv:hep-ex_9808011 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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7.
(85)
Bose-Einstein correlations of three charged pions in hadronic $Z^{0}$ decays / OPAL Collaboration
Bose-Einstein Correlations (BEC) of three identical charged pions were studied in 4 x 10^6 hadronic Z^0 decays recorded with the OPAL detector at LEP. The genuine three-pion correlations, corrected for the Coulomb effect, were separated from the known two-pion correlations by a new subtraction procedure. [...]
hep-ex/9806036; CERN-EP-98-068; CERN-EP-98-68; CERN-EP-98-068.- Geneva : CERN, 1998 - 19 p. - Published in : Eur. Phys. J. C 5 (1998) 239-248 Fulltext: arXiv:hep-ex_9806036 - PDF; 9806036 - PDF; External link: hep-ex/9806036 PDF - Please contact the library if you need to access this document.
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8.
(85)
Polarization and forward-backward asymmetry of $\Lambda$ baryons in hadronic $Z^0$ decays / OPAL Collaboration
The longitudinal polarization, the transverse polarization, and the forward-backward asymmetry of Lambda baryons have been measured using a sample of 4.34 million hadronic Z^0 decays collected with the OPAL detector at LEP between 1990 and 1995. These results are important as an aid to the understanding of hadronization mechanisms. [...]
hep-ex/9708027; CERN-PPE-97-104; CERN-PPE-97-104.- Geneva : CERN, 1998 - 22 p. - Published in : Eur. Phys. J. C 2 (1998) 49-59 Fulltext: 9708027 - PDF; arXiv:hep-ex_9708027 - PDF; ppe-97-104 - PDF; External link: Rivet analyses reference - Please contact the library if you need to access this document.
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9.
(85)
Multi-photon final states in $e^+ e^-$ collisions at $\sqrt{s}$ = 130-172 GeV / OPAL Collaboration
The process e^+e^- -> gamma gamma (gamma) is studied using data recorded with the OPAL detector at LEP. The data sample corresponds to a total integrated luminosity of 25.38 pb^{-1} taken at centre-of-mass energies of 130-172 GeV. [...]
hep-ex/9709002; CERN-PPE-97-109; CERN-PPE-97-109.- Geneva : CERN, 1998 - 25 p. - Published in : Eur. Phys. J. C 1 (1998) 21-30 Fulltext: 9709002 - PDF; arXiv:hep-ex_9709002 - PDF; External link: hep-ex/9709002 PDF - Please contact the library if you need to access this document.
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10.
(84)
Search for resonant $\widetilde\nu$ production at $\sqrt{s}$ = 183 to 208 GeV / DELPHI Collaboration
Searches for resonant sneutrino production in e+e- collisions under the assumption that R-parity is not conserved and that the dominant R-parity violating coupling is lambda_{121} or lambda_{131} used data recorded by DELPHI in 1997 to 2000 at centre-of-mass energies of 183 to 208 GeV. No deviation from the Standard Model was observed. [...]
hep-ex/0303033; CERN-EP-2002-090; CERN-EP-2002-090.- Geneva : CERN, 2003 - 19 p. - Published in : Eur. Phys. J. C 28 (2003) 15-26 Fulltext: ep-2002-090 - PDF; arXiv:hep-ex_0303033 - PDF; 0303033 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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