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CERN Document Server Намерени са 133 записа  1 - 10следващкрай  отиване на запис: Търсенето отне 0.74 секунди. 
1.
Measurement of the quark to photon fragmentation function through the inclusive production of prompt photons in hadronic $Z^0$ decays / OPAL Collaboration
The inclusive production of prompt photons with energy above 10 GeV is measured using the OPAL detector in hadronic Z^0 decays at LEP. In contrast to previous measurements, the prompt photons were not required to be isolated. [...]
hep-ex/9708020; CERN-PPE-97-086; CERN-PPE-97-86; CERN-PPE-97-086.- Geneva : CERN, 1998 - 24 p. - Published in : Eur. Phys. J. C 2 (1998) 39-48 Fulltext: PDF; External links: Fulltext; Fulltext
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2.
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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3.
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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4.
Measurement of $Z/\gamma^{*}$ production in Compton scattering of quasi-real photons / OPAL Collaboration
The process e+ e- -> e+ e- Z/gamma* is studied with the OPAL detector at LEP at a centre of mass energy of sqrt(s) = 189 GeV. The cross-section times the branching ratio of the Z/gamma* decaying into hadrons is measured within Lorentz invariant kinematic limits to be (1.2 +/- 0.3 +/- 0.1) pb for invariant masses of the hadronic system between 5 GeV and 60 GeV and (0.7 +/- 0.2 +/- 0.1) pb for hadronic masses above 60 GeV. [...]
hep-ex/0107047; CERN-EP-2001-053; CERN-EP-2001-053.- Geneva : CERN, 2002 - 35 p. - Published in : Eur. Phys. J. C 24 (2002) 1-15 Fulltext: arXiv:hep-ex_0107047 - PDF; 0107047 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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5.
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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6.
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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7.
Angular Analysis of the Muon Pair Asymmetry at LEP 1 / OPAL Collaboration
Data on muon pair production obtained by the OPAL collaboration at centre of mass energies near the Z peak are analysed. Small angular mismatches between the directions of the two muons are used to assess the effects of initial state photon radiation and initial-final-state radiation interference on the forward-backward asymmetry of muon pairs. [...]
hep-ex/0107046; CERN-EP-2001-052; CERN-EP-2001-052.- Geneva : CERN, 2001 - 31 p. - Published in : Phys. Lett. B 516 (2001) 1-20 Fulltext: arXiv:hep-ex_0107046 - PDF; 0107046 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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8.
Measurement of |$V_{ub}$| using b hadron semileptonic decays / OPAL Collaboration
The magnitude of the CKM matrix element Vub is determined by measuring the inclusive charmless semileptonic branching fraction of beauty hadrons at OPAL based on b -> Xu l nu event topology and kinematics. This analysis uses OPAL data collected between 1991 and 1995, which correspond to about four million hadronic Z decays. [...]
hep-ex/0107016; CERN-EP-2001-044; CERN-EP-2001-044.- Geneva : CERN, 2001 - 22 p. - Published in : Eur. Phys. J. C 21 (2001) 399-410 Fulltext: 0107016 - PDF; arXiv:hep-ex_0107016 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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9.
Search for Single Leptoquark and Squark Production in Electron-Photon Scattering at $\sqrt{s_{ee}}$ = 189 GeV at LEP / OPAL Collaboration
A search for first generation scalar and vector leptoquarks (LQ) as well as for squarks in R-parity violating SUSY models has been performed using e+e- collisions collected with the OPAL detector at LEP at an e+e- centre-of-mass energy sqrt(s_ee) of 189 GeV. The data correspond to an integrated luminosity of about 160 pb-1. [...]
hep-ex/0106031; CERN-EP-2001-040; CERN-EP-2001-040.- Geneva : CERN, 2002 - 27 p. - Published in : Eur. Phys. J. C 23 (2002) 1-11 Fulltext: 0106031 - PDF; arXiv:hep-ex_0106031 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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10.
Precision Neutral Current Asymmetry Parameter Measurements from the Tau Polarization at LEP / OPAL Collaboration
Measurements of the tau lepton polarization and forward-backward polarization asymmetry near the Z resonance using the OPAL detector are described. The measurements are based on analyses of tau -> e nu_e nu_tau, tau -> mu nu_mu nu_tau, tau -> pi nu_tau, tau -> rho nu_tau and tau -> a1 nu_tau decays from a sample of 144810 e+e- -> tau+ tau- candidates corresponding to an integrated luminosity of 151 pb-1. [...]
hep-ex/0103045; CERN-EP-2001-023; CERN-EP-2001-023.- Geneva : CERN, 2001 - 36 p. - Published in : Eur. Phys. J. C 21 (2001) 1-21 Fulltext: 0103045 - PDF; arXiv:hep-ex_0103045 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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CERN Document Server : Намерени са 133 записа   1 - 10следващкрай  отиване на запис:
Виж също: автори с подобни имена
97 McDonald, W J
1 McDonald, W M
45 McDonald, W.J.
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