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CERN Document Server Намерени са 2,047 записа  1 - 10следващкрай  отиване на запис: Търсенето отне 1.20 секунди. 
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Search for Yukawa Production of a Light Neutral Higgs Boson at LEP / OPAL Collaboration
Within a Two-Higgs-Doublet Model (2HDM) a search for a light Higgs boson in the mass range of 4-12 GeV has been performed in the Yukawa process e+e- -> b bbar A/h -> b bbar tau+tau-, using the data collected by the OPAL detector at LEP between 1992 and 1995 in e+e- collisions at about 91 GeV centre-of-mass energy. A likelihood selection is applied to separate background and signal. [...]
hep-ex/0111010; CERN-EP-2001-077; CERN-EP-2001-077.- Geneva : CERN, 2002 - 25 p. - Published in : Eur. Phys. J. C 23 (2002) 397-407 Fulltext: ep-2001-077 - PDF; arXiv:hep-ex_0111010 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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2.
(91)
Two Higgs Doublet Model and Model Independent Interpretation of Neutral Higgs Boson Searches / OPAL Collaboration
Searches for the neutral Higgs bosons h0 and A0, are used to obtain limits on the Type II Two Higgs Doublet Model (2HDM(II)) with no CP-violation in the Higgs sector and no additional particles besides the five Higgs bosons. The analysis combines approximately 170 pb-1 of data collected with the OPAL detector at sqrt{s} ~ 189 GeV with previous runs at sqrt{s} ~ mZ and sqrt{s} ~ 183 GeV. [...]
hep-ex/0007040; CERN-EP-2000-092; CERN-EP-2000-092.- Geneva : CERN, 2001 - 37 p. - Published in : Eur. Phys. J. C 18 (2001) 425-445 Fulltext: 0007040 - PDF; arXiv:hep-ex_0007040 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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3.
(85)
Flavour Independent $h^{0}A^{0}$ Search and Two Higgs Doublet Model Interpretation of Neutral Higgs Boson Searches at LEP / OPAL Collaboration
Upper limits on the cross-section of the pair-production process e+e- -> h0A0 assuming 100% decays into hadrons, are derived from a new search for the h0A0 -> hadrons topology, independent of the hadronic flavour of the decay products. Searches for the neutral Higgs bosons h0 and A0, are used to obtain constraints on the Type II Two Higgs Doublet Model (2HDM(11)) with no CP violation in the Higgs sector and no additional non Standard Model particles besides the five Higgs bosons. [...]
hep-ex/0408097; CERN-PH-EP-2004-039; CERN-PH-EP-2004-039.- Geneva : CERN, 2005 - 37 p. - Published in : Eur. Phys. J. C 40 (2005) 317-332 Fulltext: phep-2004-039 - PDF; arXiv:hep-ex_0408097 - PDF; 0408097 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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4.
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Search for Charged Higgs Bosos in $e^{+}e^{-}$ Collisions at $\sqrt{s}$ = 189-209 GeV / OPAL collaboration
A search is made for charged Higgs bosons predicted by Two-Higgs-Doublet extensions of the Standard Model (2HDM) using electron-positron collision data collected by the OPAL experiment at sqrts=189-209 GeV, corresponding to an integrated luminosity of approximately 600pb-1. Charged Higgs bosons are assumed to be pair-produced and to decay into qq, tnt or AWpm. [...]
arXiv:0812.0267; CERN-PH-EP-2008-016; CERN-PH-EP-2008-016.- Geneva : CERN, 2012-07-24 - 32 p. - Published in : Eur. Phys. J. C 72 (2012) 2076 Fulltext: PDF; External links: Fulltext; Fulltext
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5.
(77)
A Measurement of the $\tau^{-}\to \mu^{-}\overline{\nu}_{\mu}\nu_{\tau}$ Branching Ratio / OPAL Collaboration
The tau -> mu nu nu branching ratio has been measured using data collected from 1990 to 1995 by the OPAL detector at the LEP collider. The resulting value of B(tau -> mu nu nu) = 0.1734 +- 0.0009(stat) +- 0.0006(syst) has been used in conjunction with other OPAL measurements to test lepton universality, yielding the coupling constant ratios gmu/ge=1.0005+-0.0044 and gt/ge=1.0031+-0.0048, in good agreement with the Standard Model prediction of unity. [...]
hep-ex/0211066; CERN-EP-2002-085; CERN-EP-2002-085.- Geneva : CERN, 2003 - 20 p. - Published in : Phys. Lett. B 551 (2003) 35-48 Fulltext: S0370269302030204 - XML; ep-2002-085 - PDF; arXiv:hep-ex_0211066 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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6.
(75)
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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7.
(74)
Search for the Standard Model Higgs Boson in $e^{+}e^{-}$ Collisions at $\sqrt{s}$ = 192-209 GeV / OPAL Collaboration
A search for the Standard Model Higgs boson has been performed with the OPAL detector at LEP based on the full data sample collected at sqrt(s) = 192-209 GeV in 1999 and 2000, corresponding to an integrated luminosity of approximately 426 pb-1. The data are examined for their consistency with the background-only hypothesis and various Higgs boson mass hypotheses. [...]
hep-ex/0101014; CERN-EP-2000-156; CERN-EP-2000-156.- Geneva : CERN, 2001 - 20 p. - Published in : Phys. Lett. B 499 (2001) 38-52 Fulltext: 0101014 - PDF; arXiv:hep-ex_0101014 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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8.
(74)
Search for Doubly Charged Higgs Bosons with the OPAL detector at LEP / OPAL Collaboration
A search for pair-produced doubly charged Higgs bosons has been performed using data samples corresponding to an integrated luminosity of about 614 pb-1 collected with the OPAL detector at LEP at centre-of-mass energies between 189GeV and 209GeV. No evidence for a signal has been observed. [...]
hep-ex/0111059; CERN-EP-2001-082; CERN-EP-2001-082.- Geneva : CERN, 2002 - 19 p. - Published in : Phys. Lett. B 526 (2002) 221-232 Fulltext: arXiv:hep-ex_0111059 - PDF; ep-2001-082 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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9.
(73)
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.
(72)
Search for charged Higgs bosons in $e^+ e^-$ collisions at $\sqrt{s}$ = 130-172 GeV / OPAL Collaboration
A search is described to detect charged Higgs bosons via the process e^+e^- -> H^+H^-, using data collected by the OPAL detector at center-of-mass energies of 130-172 GeV with a total integrated luminosity of 25 pb^-1. The decay channels are assumed to be H^+ -> qq'(bar) and H^+ -> \tau^+ \nu_{\tau}. [...]
hep-ex/9802004; CERN-PPE-97-168; CERN-PPE-97-168.- Geneva : CERN, 1998 - 18 p. - Published in : Phys. Lett. B 426 (1998) 180-192 Fulltext: 9802004 - PDF; ppe-97-168 - PDF; arXiv:hep-ex_9802004 - PDF; External link: hep-ex/9802004 PDF - Please contact the library if you need to access this document.
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