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CERN Document Server	37 のレコードが見つかりました。 1 - 10 レコードへジャンプ：	検索にかかった時間： 0.71 秒

Measurement of the $e^+ e^- \to W^+ W^-$ cross section and W decay branching fractions at LEP / OPAL Collaboration
From a total data sample of 701.1 pb^-1 recorded with e+e- centre-of-mass energies of sqrt = 161-209 GeV with the OPAL detector at LEP, 11693 W-pair candidate events are selected. These data are used to obtain measurements of the W-pair production cross sections at 10 different centre-of-mass energies. [...]
arXiv:0708.1311; CERN-PH-EP-2007-027; OPAL-PR-424; CERN-PH-EP-2007-027.- Geneva : CERN, 2007 - 33 p. - Published in : Eur. Phys. J. C 52 (2007) 767-785 Fulltext: arXiv:0708.1311 - PDF; phep-2007-027 - PDF; External link: DURHAM

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Bose-Einstein study of position-momentum correlations of charged pions in hadronic $Z^{0}$ decays / OPAL Collaboration
A study of Bose-Einstein correlations in pairs of identically charged pions produced in e+e- annihilations at the Z0 peak has been performed for the first time assuming a non-static emitting source. The results are based on the high statistics data obtained with the OPAL detector at LEP. [...]
arXiv:0708.1122; CERN-PH-EP-2007-025; OPAL-PR423; CERN-PH-EP-2007-025.- Geneva : CERN, 2007 - 25 p. - Published in : Eur. Phys. J. C 52 (2007) 787-803 Fulltext: phep-2007-025 - PDF; arXiv:0708.1122 - PDF; External link: Preprint

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Inclusive Production of Charged Hadrons in Photon-Photon Collisions / OPAL Collaboration
The inclusive production of charged hadrons in the collisions of quasi-real photons e+e- -> e+e- +X has been measured using the OPAL detector at LEP. The data were taken at e+e- centre-of-mass energies from 183 to 209 GeV. [...]
hep-ex/0612045; CERN-PH-EP-2006-038; CERN-PH-EP-2006-038.- Geneva : CERN, 2007 - 21 p. - Published in : Phys. Lett. B 651 (2007) 92-101 Fulltext: arXiv:hep-ex_0612045 - PDF; 0612045 - PDF; phep-2006-038 - PDF; External link: Preprint

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Measurement of the strong coupling $\alpha^{s}$ from four-jet observables in $e^{+}e^{-}$ annihilation / OPAL Collaboration
Data from e+e- annihilation into hadrons at centre-of-mass energies between 91 GeV and 209 GeV collected with the OPAL detector at LEP, are used to study the four-jet rate as a function of the Durham algorithm resolution parameter ycut. The four-jet rate is compared to next-to-leading order calculations that include the resummation of large logarithms. [...]
hep-ex/0601048; CERN-PH-EP-2005-057; CERN-PH-EP-2005-057.- Geneva : CERN, 2006 - 25 p. - Published in : Eur. Phys. J. C 47 (2006) 295-307 Fulltext: phep-2005-057 - PDF; 0601048 - PDF; arXiv:hep-ex_0601048 - PDF; External link: Preprint

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Determination of $\alpha_{s}$ using Jet Rates at LEP with the OPAL detector / OPAL Collaboration
Hadronic events produced in e+e- collisions by the LEP collider and recorded by the OPAL detector were used to form distributions based on the number of reconstructed jets. The data were collected between 1995 and 2000 and correspond to energies of 91 GeV, 130-136 GeV and 161-209 GeV. [...]
hep-ex/0507047; CERN-PH-EP-2005-024; CERN-PH-EP-2005-024.- Geneva : CERN, 2006 - 40 p. - Published in : Eur. Phys. J. C 45 (2006) 547-568 Fulltext: 0507047 - PDF; phep-2005-024 - PDF; arXiv:hep-ex_0507047 - PDF; External link: Preprint

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Measurement of the running of the QED coupling in small-angle Bhabha scattering at LEP / OPAL Collaboration
Using the OPAL detector at LEP, the running of the effective QED coupling alpha(t) is measured for space-like momentum transfer from the angular distribution of small-angle Bhabha scattering. In an almost ideal QED framework, with very favourable experimental conditions, we obtain: Delta alpha(-6.07GeV^2) - Delta alpha(-1.81GeV^2) = (440 pm 58 pm 43 pm 30) X 10^-5, where the first error is statistical, the second is the experimental systematic and the third is the theoretical uncertainty. [...]
hep-ex/0505072; CERN-PH-EP-2005-014; CERN-PH-EP-2005-014.- Geneva : CERN, 2006 - 44 p. - Published in : Eur. Phys. J. C 45 (2006) 1-21 Fulltext: arXiv:hep-ex_0505072 - PDF; phep-2005-014 - PDF; External link: Preprint - Please contact the library if you need to access this document.

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Study of Z Pair Production and Anomalous Couplings in $e^+ e^-$ Collisions at $\sqrt{s}$ between 190 GeV and 209 GeV / OPAL Collaboration
A study of Z-boson pair production in e+e- annihilation at center-of-mass energies between 190 GeV and 209 GeV is reported. Final states containing only leptons, (l+l-l+l- and l+l-nn), quark and lepton pairs, (qql+l-, qqnn) and only hadrons (qqqq) are considered. [...]
hep-ex/0310013; CERN-EP-2003-049; CERN-EP-2003-049.- Geneva : CERN, 2003 - 35 p. - Published in : Eur. Phys. J. C 32 (2003) 303-322 Fulltext: arXiv:hep-ex_0310013 - PDF; 0310013 - PDF; ep-2003-049 - PDF; External link: Preprint - Please contact the library if you need to access this document.

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Measurement of event shape distributions and moments in $e^{+}e^{-} \to$ hadrons at 91-209 GeV and a determination of $\alpha_{s}$ / OPAL Collaboration
We have studied hadronic events from e+e- annihilation data at centre-of-mass energies from 91 to 209 GeV. We present distributions of event shape observables and their moments at each energy and compare with QCD Monte Carlo models. [...]
hep-ex/0503051; CERN-PH-EP-2004-044; CERN-PH-EP-2004-044.- Geneva : CERN, 2005 - 63 p. - Published in : Eur. Phys. J. C 40 (2005) 287-316 Fulltext: phep-2004-044 - PDF; arXiv:hep-ex_0503051 - PDF; 0503051 - PDF; External links: Fulltext; Rivet analyses reference - Please contact the library if you need to access this document.

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Measurement of $R_b$ in $e^+ e^-$ Collisions at 182 - 209 GeV / OPAL Collaboration
Measurements of Rb, the ratio of the bbbar cross-section to the qqbar cross- section in e+e- collisions, are presented. The data were collected by the OPAL experiment at LEP at centre-of-mass energies between 182 GeV and 209 GeV. [...]
hep-ex/0410034; CERN-PH-EP-2004-051; CERN-PH-EP-2004-051.- Geneva : CERN, 2005 - 21 p. - Published in : Phys. Lett. B 609 (2005) 212-225 Fulltext: phep-2004-051 - PDF; arXiv:hep-ex_0410034 - PDF; 0410034 - PDF; External link: Preprint - Please contact the library if you need to access this document.

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10.

Determination of the LEP Beam Energy using Radiative Fermion-pair Events, 2004 / OPAL Collaboration
We present a determination of the LEP beam energy using radiative return fermion-pair events recorded at centre-of-mass energies from 183 GeV to 209 GeV. We find no evidence of a disagreement between the OPAL data and the LEP Energy Workings Group's standard calibration [...]
hep-ex/0408130; CERN-PH-EP-2004-042; CERN-PH-EP-2004-042.- Geneva : CERN, 2004 - 24 p. - Published in : Phys. Lett. B 604 (2004) 31-47 Fulltext: arXiv:hep-ex_0408130 - PDF; 0408130 - PDF; S0370269304015151 - XML; phep-2004-042 - PDF; External link: Preprint - Please contact the library if you need to access this document.

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