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CERN Document Server 2,049 records found  1 - 10nextend  jump to record: Search took 0.99 seconds. 
1.
(100)
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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2.
(91)
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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3.
(77)
Search for associated production of massive states decaying into two photons in $e^{+}e^{-}$ annihilations at $\sqrt{s}$ = 88 - 209 GeV / OPAL Collaboration
A search is performed for production of short-lived particles in e+e- -> XY, with X -> gamma gamma and Y -> ffbar, for scalar X and scalar or vector Y. Model-independent limits in the range of 25-60 femtobarns are presented on sigma (e+e- -> XY) x B(X -> ffbar) for centre-of-mass energies in the range 205-207 GeV. [...]
hep-ex/0207027; CERN-EP-2002-045; CERN-EP-2002-045.- Geneva : CERN, 2002 - 17 p. - Published in : Phys. Lett. B 544 (2002) 44-56 Fulltext: ep-2002-045 - PDF; arXiv:hep-ex_0207027 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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4.
(76)
A Study of One-Prong Tau Decays with a Charged Kaon / OPAL Collaboration
From an analysis of the ionisation energy loss of charged particles selected from 110326 e+e- -> tau+tau- candidates recorded by the OPAL detector at e+e- centre-of-mass energies near the Z0 resonance, we determine the one-prong tau decay branching ratios: Br(tau- -> nu_tau K- >=0h0) = 1.528 +- 0.039 +- 0.040 % Br(tau- -> nu_tau K-) = 0.658 +- 0.024 +- 0.029 % where the h0 notation refers to a pi0, an eta, a K^0_S, or a K^0_L, and where the first uncertainty is statistical and the second is systematic..
hep-ex/0009017; CERN-EP-2000-091; OPAL-PR-315; CERN-EP-2000-091.- Geneva : CERN, 2001 - 31 p. - Published in : Eur. Phys. J. C 19 (2001) 653-665 Fulltext: 0009017 - PDF; arXiv:hep-ex_0009017 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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5.
(76)
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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6.
(75)
Search for Chargino and Neutralino Production at $\sqrt{s}$ = 192-209 GeV at LEP / OPAL Collaboration
Approximately 438 pb-1 of e+e- data from the OPAL detector, taken with the LEP collider running at centre-of-mass energies of 192-209 Gev, are analyzed to search for evidence of chargino pair production, e+e- -> tilde chi^+_1 tilde chi^-_1, or neutralino associated production, e+e- -> tilde chi^0_2 tilde chi^0_1. Limits are set at the 95% confidence level on the product of the cross-section for the process e+e- -> tilde chi^+_1 tilde chi^-_1 and its branching ratios to topologies containing jets and missing energy, of jest with a lepton and missing energy, and on the product of the cross-section for e+e- -> tilde chi^0_2 tilde chi^0_1 and its branching ratio to jets. [...]
hep-ex/0401026; CERN-EP-2003-090; CERN-EP-2003-090.- Geneva : CERN, 2004 - 34 p. - Published in : Eur. Phys. J. C 35 (2004) 1-20 Fulltext: 0401026 - PDF; arXiv:hep-ex_0401026 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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7.
(75)
A determination of the centre-of-mass energy at LEP2 using radiative two-fermion events / DELPHI Collaboration
Using e+e- -> mu+mu-(gamma) and e+e- -> qqbar(gamma) events radiative to the Z pole, DELPHI has determined the centre-of-mass energy, sqrt{s}, using energy and momentum constraint methods. The results are expressed as deviations from the nominal LEP centre-of-mass energy, measured using other techniques. [...]
hep-ex/0602016; CERN-PH-EP-2005-050; CERN-PH-EP-2005-050.- Geneva : CERN, 2006 - 20 p. - Published in : Eur. Phys. J. C 46 (2006) 295-305 Fulltext: 0602016 - PDF; arXiv:hep-ex_0602016 - PDF; External link: Preprint
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8.
(75)
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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9.
(75)
An upper limit for the $\tau$-neutrino mass from $\tau \to 5\pi^{\pm} \nu_{\tau}$ decays / OPAL Collaboration
An upper limit for the tau-neutrino mass has been determined from the decay tau -> 5pi+- \nu_tau using data collected with the OPAL detector from 1991 to 1995 in e+e- collisions at \sqrt{s} ~ M_Z. A limit of 43.2 MeV at 95% CL is obtained using a two-dimensional method in the 5pi invariant mass and energy distribution from 22 selected events. [...]
hep-ex/9806035; CERN-EP-98-055; CERN-EP-98-55; CERN-EP-98-055.- Geneva : CERN, 1998 - 17 p. - Published in : Eur. Phys. J. C 5 (1998) 229-237 Fulltext: 9806035 - PDF; arXiv:hep-ex_9806035 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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10.
(74)
Measurement of the Branching Ratio for $D_{s} \to \tau\nu_{\tau}$ Decays / OPAL Collaboration
Using about 3.9 million hadronic Z decays from e+e- collisions recorded by the OPAL detector at LEP at centre-of-mass energies near MZ the branching ratio for the decay D_s -> tau nu_tau has been measured to be (7.0 +/- 2.1(stat) +/- 2.0 (syst))%. This result can be used to derive the decay constant of the D_s meson: f(D_s) = 286 +/- 44(stat) +/- 41(syst) MeV..
hep-ex/0103012; CERN-EP-2001-019; CERN-EP-2001-019.- Geneva : CERN, 2001 - 23 p. - Published in : Phys. Lett. B 516 (2001) 236-248 Fulltext: 0103012 - PDF; arXiv:hep-ex_0103012 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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