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CERN Document Server 2,045 records found  1 - 10próximoend  jump to record: Search took 0.99 seconds. 
1.
(100)
Measurement of the Branching Ratio for $D_{s} \to \tau\nu_{\tau}$ Decays / OPAL Collaboration
Using about 3.9 million hadronic Z decays from e+e- collisions recorded by the OPAL detector at LEP at centre-of-mass energies near MZ the branching ratio for the decay D_s -> tau nu_tau has been measured to be (7.0 +/- 2.1(stat) +/- 2.0 (syst))%. This result can be used to derive the decay constant of the D_s meson: f(D_s) = 286 +/- 44(stat) +/- 41(syst) MeV..
hep-ex/0103012; CERN-EP-2001-019; CERN-EP-2001-019.- Geneva : CERN, 2001 - 23 p. - Published in : Phys. Lett. B 516 (2001) 236-248 Fulltext: 0103012 - PDF; arXiv:hep-ex_0103012 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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2.
(91)
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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3.
(86)
A measurement of the $B^{0}_{s}$ lifetime using reconstructed $D^{-}_{s}$ mesons / OPAL Collaboration
We report a measurement of the B^0_s meson lifetime from B_s^0 -> D^-_s X decays, where D_s^- mesons are reconstructed in the D_s^- -> phi pi^- and D_s^- -> K^{*0} K^- decay channels. From approximately 3.7 million hadronic Z^0 decays recorded by the OPAL detector at LEP a sample is selected containing 911 +/- 83 candidates, of which 519 +/- 136 are estimated to be from B_s^0 meson decays. [...]
hep-ex/9708023; CERN-PPE-97-095; CERN-PPE-97-95; CERN-PPE-97-095.- Geneva : CERN, 1998 - 20 p. - Published in : Eur. Phys. J. C 2 (1998) 407-416 Fulltext: ppe-97-095 - PDF; arXiv:hep-ex_9708023 - PDF; - Please contact the library if you need to access this document.
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4.
(81)
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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5.
(80)
An upper limit for the $\tau$-neutrino mass from $\tau \to 5\pi^{\pm} \nu_{\tau}$ decays / OPAL Collaboration
An upper limit for the tau-neutrino mass has been determined from the decay tau -> 5pi+- \nu_tau using data collected with the OPAL detector from 1991 to 1995 in e+e- collisions at \sqrt{s} ~ M_Z. A limit of 43.2 MeV at 95% CL is obtained using a two-dimensional method in the 5pi invariant mass and energy distribution from 22 selected events. [...]
hep-ex/9806035; CERN-EP-98-055; CERN-EP-98-55; CERN-EP-98-055.- Geneva : CERN, 1998 - 17 p. - Published in : Eur. Phys. J. C 5 (1998) 229-237 Fulltext: 9806035 - PDF; arXiv:hep-ex_9806035 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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6.
(79)
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.
(79)
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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8.
(78)
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.
(78)
Measurement of the Michel Parameters in Leptonic Tau Decays / OPAL Collaboration
The Michel parameters of the leptonic tau decays are measured using the OPAL detector at LEP. The Michel parameters are extracted from the energy spectra of the charged decay leptons and from their energy-energy correlations. [...]
hep-ex/9808016; CERN-EP-98-104; CERN-EP-98-104.- Geneva : CERN, 1999 - 32 p. - Published in : Eur. Phys. J. C 8 (1999) 3-21 Fulltext: arXiv:hep-ex_9808016 - PDF; 9808016 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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10.
(78)
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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