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CERN Document Server Pronađeno je 2,048 zapisa  1 - 10slijedećikraj  idi na zapis: Pretraživanje je potrajalo 1.15 sekundi 
1.
(100)
Search for new Physics in rare B Decays / OPAL Collaboration
A search for the decay B+- to K+-K+-pi-+ was performed using data collected by the OPAL detector at LEP. These decays are strongly suppressed in the Standard Model but could occur with a higher branching ratio in supersymmetric models, especially in those with R-parity violating couplings. [...]
hep-ex/0002008; CERN-EP-99-179; CERN-EP-99-179.- Geneva : CERN, 2000 - 16 p. - Published in : AIP Conf. Proc. 549 (2000) 609-613 Fulltext: cer-002174670 - PDF; arXiv:hep-ex_0002008 - PDF; External link: Preprint
In : 7th Conference on the Intersections between Particle and Nuclear Physics, Quebec City, Canada, 22 - 28 May 2000, pp.609-613 - Please contact the library if you need to access this document.
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2.
(91)
First Measurement of the Inclusive Branching Ratio of b Hadrons $\to \phi$ Mesons in $Z^{0}$ Decays / OPAL Collaboration
The inclusive production rate of phi mesons from the decay of b hadrons produced in Z0 decays was measured to be Br(b->phi+X) = 0.0282+-0.0013(stat.)+-0.0019(syst.), using data collected by the OPAL detector at LEP..
hep-ex/0007015; CERN-EP-2000-065; CERN-EP-2000-065.- Geneva : CERN, 2000 - 13 p. - Published in : Phys. Lett. B 492 (2000) 13-22 Fulltext: 0007015 - PDF; arXiv:hep-ex_0007015 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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3.
(88)
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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4.
(86)
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.
(85)
Bose-Einstein correlations in $K^{\pm}K^{\pm}$ pairs from $Z^{0}$ decays into two hadronic jets / OPAL Collaboration
Bose-Einstein correlations in pairs of charged kaons produced in a sample of 3.9 million hadronic Z0 decays have been measured with the OPAL experiment at LEP. Charged kaons were identified in the central tracking detector using their specific energy loss in the drift chamber gas. [...]
hep-ex/0001045; CERN-EP-99-163; CERN-EP-99-163.- Geneva : CERN, 2001 - 25 p. - Published in : Eur. Phys. J. C 21 (2001) 23-32 Fulltext: arXiv:hep-ex_0001045 - PDF; 0001045 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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6.
(85)
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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7.
(85)
Search for Unstable Heavy and Excited Leptons at LEP2 / OPAL Collaboration
Searches for unstable neutral and charged heavy leptons, N and L+-, and for excited states of neutral and charged leptons, nu*, e*, mu*, and tau*, have been performed in e+e- collisions using data collected by the OPAL detector at LEP. The data analysed correspond to an integrated luminosity of about 58pb-1 at a centre-of-mass energy of 183GeV, and about 10pb-1 each at 161GeV and 172GeV. [...]
hep-ex/0001056; CERN-EP-99-169; CERN-EP-99-169.- Geneva : CERN, 2000 - 27 p. - Published in : Eur. Phys. J. C 14 (2000) 73-84 Fulltext: arXiv:hep-ex_0001056 - PDF; 0001056 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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8.
(85)
Measurement of the Semileptonic Branching Ratio of Charm Hadrons Produced in $Z^{0} \to c\bar{c}$ Decays / OPAL Collaboration
The inclusive charm hadron semileptonic branching fractions B(c to e) and B(c to mu) in Z to ccbar events have been determined using 4.4 million hadronic Z decays collected with the OPAL detector at LEP. A charm-enriched sample is obtained by selecting events with reconstructed D*+- mesons. [...]
hep-ex/9810016; CERN-EP-98-146; CERN-EP-98-146.- Geneva : CERN, 1999 - 23 p. - Published in : Eur. Phys. J. C 8 (1999) 573-84 Fulltext: 9810016 - PDF; arXiv:hep-ex_9810016 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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9.
(84)
Search for Unstable Heavy and Excited Leptons in $e^+ e^-$ Collisions at $\sqrt{s}$ = 170-172 GeV / OPAL Collaboration
We have searched for unstable neutral and charged heavy leptons, N and L^+/-, and for excited states of neutral and charged leptons, nu*, e*, mu* and tau*, in e^+e^- collisions at centre-of-mass energies of 170 and 172 GeV using the OPAL detector at LEP. No evidence for their existence was found. [...]
hep-ex/9709027; CERN-PPE-97-123; CERN-PPE-97-123.- Geneva : CERN, 1998 - 42 p. - Published in : Eur. Phys. J. C Fulltext: arXiv:hep-ex_9709027 - PDF; 9709027 - PDF; External link: hep-ex/9709027 PDF - Please contact the library if you need to access this document.
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10.
(84)
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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