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CERN Document Server Encontrados 2,046 registros  1 - 10siguientefinal  ir al registro: La búsqueda tardó 0.91 segundos. 
1.
(100)
Search for Lepton Flavour Violation in $e^+e^-$ Collisions at $\sqrt{s}$ = 189 - 209 GeV / OPAL Collaboration
We search for lepton flavour violating events (e mu, e tau and mu tau) that could be directly produced in e+e- annihilations, using the full available data sample collected with the OPAL detector at centre-of-mass energies between 189 GeV and 209 GeV. In general, the Standard Model expectations describe the data well for all the channels and at each sqrt(s). [...]
hep-ex/0109011; CERN-EP-2001-061; CERN-EP-2001-061.- Geneva : CERN, 2001 - 16 p. - Published in : Phys. Lett. B 519 (2001) 23-32 Fulltext: S0370269301010863 - XML; arXiv:hep-ex_0109011 - PDF; 0109011 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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2.
(91)
Measurement of the Low-x Behaviour of the Photon Structure Function $F2-\gamma$ / OPAL Collaboration
The photon structure function F2-gamma(x,Q**2) has been measured using data taken by the OPAL detector at centre-of-mass energies of 91Gev, 183Gev and 189Gev, in Q**2 ranges of 1.5 to 30.0 GeV**2 (LEP1), and 7.0 to 30.0 GeV**2 (LEP2), probing lower values of x than ever before. Since previous OPAL analyses, new Monte Carlo models and new methods, such as multi-variable unfolding, have been introduced, reducing significantly the model dependent systematic errors in the measurement..
hep-ex/0007018; CERN-EP-2000-082; CERN-EP-2000-082.- Geneva : CERN, 2000 - 50 p. - Published in : Eur. Phys. J. C 18 (2000) 15-39 Fulltext: arXiv:hep-ex_0007018 - PDF; 0007018 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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3.
(90)
Measurement of Neutral-Current Four-Fermion Production at LEP2 / OPAL Collaboration
Four-fermion final states qqbar e+e- and qqbar mu+mu- from neutral-current interactions in e+e- collisions are studied in the OPAL detector at LEP at centre-of-mass energies from 183 GeV to 209 GeV. The data analysed correspond to a total integrated luminosity of about 650 pb-1 recorded from 1997 to 2000. [...]
hep-ex/0210026; CERN-EP-2002-052; CERN-EP-2002-052.- Geneva : CERN, 2002 - 21 p. - Published in : Phys. Lett. B 544 (2002) 259-273 Fulltext: arXiv:hep-ex_0210026 - PDF; ep-2002-052 - PDF; S0370269302024681 - XML; External link: Preprint - Please contact the library if you need to access this document.
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4.
(87)
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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5.
(87)
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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6.
(87)
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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7.
(86)
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: ep-2003-049 - PDF; arXiv:hep-ex_0310013 - PDF; 0310013 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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8.
(85)
Search for a low mass CP-odd Higgs boson in $e^{+}e^{-}$ collisions with the OPAL detector at LEP2 / OPAL Collaboration
We have analysed the data collected by OPAL at centre-of-mass energies between 189 and 209 GeV searching for Higgs boson candidates from the process e+e- -> h0Z0 followed by the decay of h0 -> A0A0 where A0 is the CP-odd Higgs boson. The search is done in the region where the A0 mass, mA, is below the production threshold for bbbar, and the CP-even Higgs boson mass mh is within the range 45-86 GeV/c^2. [...]
hep-ex/0209068; CERN-EP-2002-058; CERN-EP-2002-058.- Geneva : CERN, 2003 - 26 p. - Published in : Eur. Phys. J. C 27 (2003) 483-95 Fulltext: arXiv:hep-ex_0209068 - PDF; ep-2002-058 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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9.
(84)
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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10.
(84)
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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