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CERN Document Server 找到 83 筆記錄  1 - 10下一個最後  跳到記錄: 檢索需時 0.65 秒. 
1.
A search for the standard model Higgs boson using the OPAL detector at LEP / Sang, W M
Geneva : CERN, 2000.
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2.
Searches for prompt light gravitino signatures in $e^{+}e^{-}$ Collisions at $\sqrt{s}$ = 189 GeV / OPAL Collaboration
Searches for final states expected in models with light gravitinos have been performed, including experimental topologies with multi-leptons with missing energy, leptons and photons with missing energy, and jets and photons with missing energy. No excess over the expectations from the Standard Model has been observed. [...]
hep-ex/0007014; CERN-EP-2000-078; CERN-EP-2000-078.- Geneva : CERN, 2001 - 19 p. - Published in : Phys. Lett. B 501 (2001) 12-27 Fulltext: 0007014 - PDF; arXiv:hep-ex_0007014 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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3.
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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4.
Photonic events with missing energy in $e^{+}e^{-}$ collisions at $\sqrt{s}=189 GeV$ / OPAL Collaboration
Photonic events with large missing energy have been observed in e+e- collisions at a centre-of-mass energy of 189GeV using the OPAL detector at LEP. Results are presented for event topologies consistent with a single photon or with an acoplanar photon pair. [...]
hep-ex/0005002; CERN-EP-2000-050; CERN-EP-2000-050.- Geneva : CERN, 2000 - 42 p. - Published in : Eur. Phys. J. C 18 (2000) 253-272 Fulltext: 0005002 - PDF; arXiv:hep-ex_0005002 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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5.
Z boson pair production in $e^{+}e^{-}$ collisions at $\sqrt{s}$ = 183 and 189 GeV / OPAL Collaboration
A study of Z boson pair production in e+e- annihilation at center-of-mass energies near 183 GeV and 189 GeV is reported. Final states containing only leptons, (l+l-l+l- and l+l-nu nubar), quark and lepton pairs, (q qbar l+l-, q qbar nu nubar) and the all-hadronic final state (q qbar q qbar) are considered. [...]
hep-ex/0003016; CERN-EP-2000-017; CERN-EP-2000-017.- Geneva : CERN, 2000 - 21 p. - Published in : Phys. Lett. B 476 (2000) 256-72 Fulltext: arXiv:hep-ex_0003016 - PDF; 0003016 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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6.
Measurement of |$V_{cb}$| using $\overline{B}^{0} \to D^{*+}l^{-}\overline{\nu}$ decays / OPAL Collaboration
The magnitude of the Cabibbo-Kobayashi-Maskawa matrix element Vcb has been measured using B0 to D*l nu decays recorded on the Z0 peak using the OPAL detector at LEP. The D* to D0 pi+ decays were reconstructed both in the particular decay modes D0 to K- pi+ and D0 to K- pi+ pi- and via an inclusive technique [...]
hep-ex/0003013; CERN-EP-2000-032; OPAL-PR-305; CERN-EP-2000-032; OPAL-PR-305.- Geneva : CERN, 2000 - 21 p. - Published in : Phys. Lett. B 482 (2000) 15-30 Fulltext: 0003013 - PDF; arXiv:hep-ex_0003013 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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7.
Measurements of the QED structure of the photon / Abbiendi, G ; Ackerstaff, K ; Alexander, Gideon ; Allison, J ; Altekamp, N ; Anderson, K J ; Anderson, S ; Arcelli, S ; Asai, S ; Ashby, S F et al.
Geneva : CERN, 1999 - Published in : Eur. Phys. J. C 11 (1999) 409-25
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8.
Transverse and Longitudinal Bose Einstein Correlations in hadronic $Z^0$ Decays / OPAL Collaboration
Bose-Einstein correlations in pairs of identical charged pions produced in asample of 4.3 million Z0 hadronic decays are studied as a function of the threecomponents of the momentum difference, transverse ("out" and "side") andlongitudinal with respect to the thrust direction of the event. A significantdifference between the transverse, r_t_side, and longitudinal, r_l, dimensionsis observed, indicating that the emitting source of identical pions, asobserved in the Longitudinally CoMoving System, has an elongated shape. [...]
hep-ex/0002062; CERN-EP-2000-004; CERN-EP-2000-004.- Geneva : CERN, 2000 - 19 p. - Published in : Eur. Phys. J. C 16 (2000) 423-433 Fulltext: 0002062 - PDF; arXiv:hep-ex_0002062 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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9.
Measurements of $R_{b}$, $A_{FB}^{b}$ and $A_{FB}^{c}$ in $e^{+}e^{-}$ Collisions at 130-189 GeV / OPAL Collaboration
The cross-section ratio Rb=sigma(e+e- to b-antib)/sigma(e+e- to q-antiq) andthe bottom and charm forward-backward asymmetries AFB^b and AFB^c are measuredusing event samples collected by the OPAL detector at centre-of-mass energiesbetween 130 and 189 GeV. Events with bottom quark production are selected witha secondary vertex tag, and a hemisphere charge algorithm is used to extractAFB^b. [...]
hep-ex/0002024; CERN-EP-99-170; CERN-EP-99-170.- Geneva : CERN, 2000 - 36 p. - Published in : Eur. Phys. J. C 16 (2000) 41-60 Fulltext: 0002024 - PDF; arXiv:hep-ex_0002024 - PDF; External link: hep-ex/0002024 PDF - Please contact the library if you need to access this document.
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10.
QCD studies with $e^{+}e^{-}$ annihilation data at 172-189 GeV / OPAL Collaboration
We have studied hadronic events from e+e- annihilation data at centre-of-mass energies of sqrt{s}=172, 183 and 189 GeV. The total integrated luminosity of the three samples, measured with the OPAL detector, corresponds to 250 pb^-1. [...]
hep-ex/0002012; CERN-EP-99-178; CERN-EP-99-178.- Geneva : CERN, 2000 - 49 p. - Published in : Eur. Phys. J. C 16 (2000) 185-210 Fulltext: 0002012 - PDF; arXiv:hep-ex_0002012 - PDF; External link: Rivet analyses reference - Please contact the library if you need to access this document.
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