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CERN Document Server 2,051 records found  1 - 10próximoend  jump to record: Search took 0.92 seconds. 
1.
(100)
W Boson Polarisation at LEP2 / OPAL Collaboration
Elements of the spin density matrix for W bosons in e+e- -> W+W- -> qqln events are measured from data recorded by the OPAL detector at LEP. This information is used calculate polarised differential cross-sections and to search for CP-violating effects. [...]
hep-ex/0312047; CERN-EP-2003-088; CERN-EP-2003-088.- Geneva : CERN, 2004 - 20 p. - Published in : Phys. Lett. B 585 (2004) 223-36 Fulltext: arXiv:hep-ex_0312047 - PDF; ep-2003-088 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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2.
(91)
Measurement of the Mass and Width of the W Boson in $e^{+}e^{-}$ Collisions at 189 GeV / OPAL Collaboration
The mass and width of the W boson are determined in e+e- collisions at LEP using 183 pb^-1 of data recorded at a centre-of-mass energy roots=189 GeV with the OPAL detector. The invariant mass distributions from 970 WW->qqqq and 1118 WW->qqln candidate events are used to measure the mass of the W boson, Mw = 80.451 +- 0.076(stat.) +- 0.049(syst.) GeV. [...]
hep-ex/0009018; CERN-EP-2000-099; CERN-EP-2000-099.- Geneva : CERN, 2001 - 24 p. - Published in : Phys. Lett. B 507 (2001) 29-46 Fulltext: arXiv:hep-ex_0009018 - PDF; 0009018 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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3.
(84)
Measurement of W boson polarisations and CP-violating triple gauge couplings from $W^{+}W^{-}$ production at LEP / OPAL Collaboration
Measurements are presented of the polarisation of W+W- boson pairs produced in e+e- collisions, and of CP-violating WWZ and WWGamma trilinear gauge couplings. The data were recorded by the OPAL experiment at LEP during 1998, where a total integrated luminosity of 183 pb^-1 was obtained at a centre-of-mass energy of 189 GeV. [...]
hep-ex/0009021; CERN-EP-2000-113; CERN-EP-2000-113.- Geneva : CERN, 2001 - 24 p. - Published in : Eur. Phys. J. C 19 (2001) 229-240 Fulltext: arXiv:hep-ex_0009021 - PDF; 0009021 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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4.
(83)
Constraints on Anomalous Quartic Gauge Boson Couplings from $\nu\overline{\nu}\gamma\gamma$ and $q\overline{q}\gamma\gamma$ events at LEP 2 / OPAL Collaboration
Anomalous quartic couplings between the electroweak gauge bosons may contribute to the vv gamma gamma and qq gamma gamma final states produced in e+e- collisions. This analysis uses the LEP2 OPAL data sample at centre-of-mass energies up to 209 GeV. [...]
hep-ex/0402021; CERN-PH-EP-2004-003; CERN-PH-EP-2004-003.- Geneva : CERN, 2004 - 23 p. - Published in : Phys. Rev. D 70 (2004) 032005 APS Published version, local copy: PDF; Fulltext: phep-2004-003 - PDF; arXiv:hep-ex_0402021 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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5.
(82)
Tests of the Standard Model and Constraints on New Physics from Measurements of Fermion-Pair Production at 189-209 GeV at LEP / OPAL Collaboration
Cross-section and angular distributions for hadronic and lepton-pair final states in e+e- collisions at centre-of-mass energies between 189 GeV and 209 GeV, measured with the OPAL detector at LEP, are presented and compared with the predictions of the Standard Model. The measurements are used to determine the electromagnetic coupling constant alphaem at LEP2 energies. [...]
hep-ex/0309053; CERN-EP-2003-053; CERN-EP-2003-053.- Geneva : CERN, 2004 - 80 p. - Published in : Eur. Phys. J. C 33 (2004) 173-212 Fulltext: arXiv:hep-ex_0309053 - PDF; ep-2003-053 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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6.
(80)
The W Boson Spin Density Matrix at OPAL / Bailey, I R
The spin states of W bosons in e<super>+</super>e<super>&minus;</super> &rarr; W<super>+</super>W<super>&minus;</super> &rarr; qq&macr;<super>&prime;</super>&ell;&nu;<sub> &ell;</sub> events r [...]
Victoria, BC : Victoria U., 2007. - 231 p.

Full text
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7.
(77)
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: phep-2007-027 - PDF; arXiv:0708.1311 - PDF; External link: DURHAM
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8.
(76)
Measurement of the mass and width of the W boson / OPAL Collaboration
The mass and width of the W boson are measured using e+e- -> W+W- events from the data sample collected by the OPAL experiment at LEP at centre-of-mass energies between 170 GeV and 209 GeV. The mass (mw) and width (gw) are determined using direct reconstruction of the kinematics of W+W- -> qqbarlv and W+W- -> qqbarqqbar events [...]
hep-ex/0508060; OPAL-PR-410; CERN-PH-EP-2005-038; CERN-PH-EP-2005-038.- Geneva : CERN, 2006 - 49 p. - Published in : Eur. Phys. J. C 45 (2006) 307-335 Fulltext: phep-2005-038 - PDF; 0508060 - PDF; arXiv:hep-ex_0508060 - PDF; External link: Preprint
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9.
(75)
Search for Single Top Quark Production at LEP2 / OPAL Collaboration
A search for single top quark production via flavour changing neutral currents (FCNC) was performed with data collected by the OPAL detector at the e+e- collider LEP. Approximately 600 pb-1 of data collected at sqrt(s) = 189 - 209 GeV were used to search for the FCNC process e+ e- -> tc(u) -> bWc(u). [...]
hep-ex/0110009; CERN-EP-2001-066; CERN-EP-2001-066.- Geneva : CERN, 2001 - 22 p. - Published in : Phys. Lett. B 521 (2001) 181-194 Fulltext: S0370269301011959 - XML; arXiv:hep-ex_0110009 - PDF; ep-2001-066 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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10.
(75)
$W^{+}W^{-}$ Production Cross Section and W Branching Fractions in $e^{+}e^{-}$ Collisions at 189 GeV / OPAL Collaboration
From a data sample of 183 pb^-1 recorded at a center-of-mass energy of roots = 189 GeV with the OPAL detector at LEP, 3068 W-pair candidate events are selected. Assuming Standard Model W boson decay branching fractions, the W-pair production cross section is measured to be sigmaWW = 16.30 +- 0.34(stat.) +- 0.18(syst.) pb. [...]
hep-ex/0009019; CERN-EP-2000-101; CERN-EP-2000-101.- Geneva : CERN, 2000 - 19 p. - Published in : Phys. Lett. B 493 (2000) 249-265 Fulltext: arXiv:hep-ex_0009019 - PDF; 0009019 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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