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CERN Document Server 2,042 records found  1 - 10nextend  jump to record: Search took 1.20 seconds. 
1.
(100)
Determination of the b Quark Mass at the Z Mass Scale / OPAL Collaboration
In hadronic decays of Z bosons recorded with the OPAL detector at LEP, events containing b quarks were selected using the long lifetime of b flavoured hadrons. Comparing the 3-jet rate in b events with that in d u,s and c quark events, a significant difference was observed. [...]
hep-ex/0105046; CERN-EP-2001-034; CERN-EP-2001-034.- Geneva : CERN, 2001 - 27 p. - Published in : Eur. Phys. J. C 21 (2001) 411-422 Fulltext: 0105046 - PDF; arXiv:hep-ex_0105046 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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2.
(82)
Charged Multiplicities in Z Decays into u, d, and s Quarks / OPAL Collaboration
About 4.4 million hadronic decays of Z bosons, recorded by the OPAL detector at LEP at a centre-of-mass energy of around sqrt(s) = 91.2 GeV, are used to determine the mean charged particle multiplicities for the three light quark flavours. Events from primary u, d, and s quarks are tagged by selecting characteristic particles which carry a large fraction of the beam energy. [...]
hep-ex/0011022; CERN-EP-2000-128; CERN-EP-2000-128.- Geneva : CERN, 2001 - 24 p. - Published in : Eur. Phys. J. C 19 (2001) 257-268 Fulltext: arXiv:hep-ex_0011022 - PDF; 0011022 - PDF; External links: Fulltext; Rivet analyses reference - Please contact the library if you need to access this document.
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3.
(82)
A Measurement of the Rate of Charm Production in W Decays / OPAL Collaboration
Using data recorded at centre-of-mass energies around 183 GeV and 189 GeV with the OPAL detector at LEP, the fundamental coupling of the charm quark to the W boson has been studied. The ratio Rc^W = Gamma(W -> cX)/Gamma(W -> hadrons) has been measured from jet properties, lifetime information, and leptons produced in charm decays. [...]
hep-ex/0009020; CERN-EP-2000-100; CERN-EP-2000-100.- Geneva : CERN, 2000 - 19 p. - Published in : Phys. Lett. B 490 (2000) 71-86 Fulltext: 0009020 - PDF; arXiv:hep-ex_0009020 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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4.
(82)
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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5.
(82)
Leading Particle Production in Light Flavour Jets / OPAL Collaboration
The energy distribution and type of the particle with the highest momentum in quark jets are determined for each of the five quark flavours making only minimal model assumptions. The analysis is based on a large statistics sample of hadronic Z0 decays collected with the OPAL detector at the LEP e+e- collider. [...]
hep-ex/0001054; CERN-EP-99-164; CERN-EP-99-164.- Geneva : CERN, 2000 - 34 p. - Published in : Eur. Phys. J. C 16 (2000) 407-421 Fulltext: arXiv:hep-ex_0001054 - PDF; 0001054 - PDF; External link: hep-ex/0001054 PDF - Please contact the library if you need to access this document.
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6.
(82)
Search for Leptoquarks in Electron-Photon Scattering at $\sqrt{s_{ee}}$ up to 209 GeV at LEP / OPAL Collaboration
Searches for first generation scalar and vector leptoquarks, and for squarks in R-parity violating SUSY models with the direct decay of the squark into Standard Model particles, have been performed using e+e- collisions collected with the OPAL detector at LEP at e+e- centre-of-mass energies between 189 and 209 GeV. No excess of events is found over the expectation from Standard Model background processes. [...]
hep-ex/0112024; CERN-EP-2001-093; CERN-EP-2001-093.- Geneva : CERN, 2002 - 23 p. - Published in : Phys. Lett. B 526 (2002) 233-246 Fulltext: arXiv:hep-ex_0112024 - PDF; ep-2001-093 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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7.
(81)
Measurement of the Hadronic Cross-Section for the Scattering of Two Virtual Photons at LEP / OPAL Collaboration
The interaction of virtual photons is investigated using the reaction e+e- -> e+e- hadrons based on data taken by the OPAL experiment at e+e- centre-of-mass energies sqrt(s_ee)=189-209 GeV, for W>5 GeV and at an average Q^2 of 17.9 GeV^2. The measured cross-sections are compared to predictions of the Quark Parton Model (QPM), to the Leading Order QCD Monte Carlo model PHOJET to the NLO prediction for the reaction e+e- -> e+e-qqbar, and to BFKL calculations. [...]
hep-ex/0110006; CERN-EP-2001-064; CERN-EP-2001-064.- Geneva : CERN, 2001 - 30 p. - Published in : Eur. Phys. J. C 24 (2002) 17-31
- Published in : PoS: hep2001 (2001) , pp. 044 Fulltext: arXiv:hep-ex_0110006 - PDF; ep-2001-064 - PDF; Published version from PoS: hep2001-044 - PDF; hep2001-044_2 - PDF; External link: Preprint
In : International Europhysics Conference on High-Energy Physics, Budapest, Hungary, 12 - 18 Jul 2001, pp.044 - Please contact the library if you need to access this document.
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8.
(81)
Search for pair-produced leptoquarks in $e^{+}e^{-}$ interactions at $\sqrt{s} \simeq$ 183 GeV / OPAL Collaboration
A search for pair-produced leptoquarks has been performed using a sample of e+e- collision events collected by the OPAL detector at LEP at e+e- centre-of-mass energies of about 183 GeV. The data sample corresponds to an integrated luminosity of 55.9 pb-1. [...]
hep-ex/9908007; CERN-EP-99-091; CERN-EP-99-091.- Geneva : CERN, 2000 - 27 p. - Published in : Eur. Phys. J. C 13 (2000) 15-27 Fulltext: 9908007 - PDF; arXiv:hep-ex_9908007 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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9.
(81)
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.
(80)
Final results from DELPHI on the searches for SM and MSSM Neutral Higgs bosons / DELPHI Collaboration
These final results from DELPHI searches for the Standard Model (SM) Higgs boson, together with benchmark scans of the Minimal Supersymmetric Standard Model (MSSM) neutral Higgs bosons, used data taken at centre-of-mass energies between 200 and 209 GeV with a total integrated luminosity of 224 pb^-1. The data from 192 to 202 GeV are reanalysed with improved b-tagging for MSSM final states decaying to four b-quarks. [...]
hep-ex/0303013; CERN-EP-2003-008; CERN-EP-2003-008.- Geneva : CERN, 2004 - 66 p. - Published in : Eur. Phys. J. C 32 (2004) 145-183 Fulltext: arXiv:hep-ex_0303013 - PDF; 0303013 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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