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CERN Document Server 2,043 záznamov nájdených  1 - 10ďalšíkoniec  skoč na záznam: Hľadanie trvalo 0.83 sekúnd. 
1.
(100)
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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2.
(79)
Search for anomalous production of photonic events with missing energy in $e^+ e^-$ collisions at $\sqrt{s}$ = 130-172 GeV / OPAL Collaboration
Photonic events with large missing energy have been observed in e+e- collisions at centre-of-mass energies of 130, 136, 161 and 172 GeV using the OPAL detector at LEP. Results are presented based on search topologies designed to select events with a single photon and missing transverse energy or events with a pair of acoplanar photons. [...]
hep-ex/9801024; CERN-PPE-97-132; CERN-PPE-97-132.- Geneva : CERN, 1998 - 40 p. - Published in : Eur. Phys. J. C 2 (1998) 607-625 Fulltext: arXiv:hep-ex_9801024 - PDF; 9801024 - PDF; External link: hep-ex/9801024 PDF - Please contact the library if you need to access this document.
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3.
(47)
Search for Anomalous Photonic Events with Missing Energy in $e^{+} e^{-}$ Collisions at $\sqrt{s}$ = 130, 136 and 183 GeV / OPAL Collaboration
Photonic events with large missing energy have been observed in $e^+ e^-$ collisions at centre-of-mass energies of 130, 136 and 183 GeV collected in 1997 using the OPAL detector at LEP. Results are presented for event topologies with a single photon and missing transverse energy or with an acoplanar photon pair. [...]
hep-ex/9810021; CERN-EP-98-143; CERN-EP-98-143.- Geneva : CERN, 1999-03-01 - 19 p. - Published in : Eur. Phys. J. C 8 (1999) 23-40 Fulltext: 9810021 - PDF; arXiv:hep-ex_9810021 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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4.
(45)
Measurements of the Cross Sections for Open Charm and Beauty Production in $\gamma\gamma$ Collisions at $\sqrt{s}$ = 189-202 GeV / L3 Collaboration
The production of c and b quarks in gamma-gamma collisions is studied with the L3 detector at LEP with 410 pb^-1 of data, collected at centre-of-mass energies from 189 GeV to 202 GeV. Hadronic final states containing c and b quarks are identified by detecting electrons or muons from their semileptonic decays. [...]
hep-ex/0011070; CERN-EP-2000-144; CERN-EP-2000-144; CERN-L3-226.- Geneva : CERN, 2001 - 17 p. - Published in : Phys. Lett. B 503 (2001) 10-20 Fulltext: 0011070 - PDF; arXiv:hep-ex_0011070 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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5.
(45)
Total Cross Section in $\gamma\gamma$ Collisions at LEP / L3 Collaboration
The reaction e+e- -> e+e- gamma* gamma* -> e+e- hadrons for quasi-real photons is studied using data from root(s) = 183 GeV up to 202 GeV. Results on the total cross sections sigma(e+e- -> e+e- hadrons) and sigma(+e- gamma* gamma* -> e+e- hadrons) are given for the two-photon centre-of-mass energies 5 GeV < Wgammagamma < 185 GeV. [...]
hep-ex/0102025; CERN-EP-2001-012; CERN-EP-2001-012; CERN-L3-235.- Geneva : CERN, 2001 - 17 p. - Published in : AIP Conf. Proc. 571 (2001) 154-159 Fulltext: arXiv:hep-ex_0102025 - PDF; 0102025 - PDF; S0370269301010723 - XML; External link: Preprint
In : Conference on Photon, Ambleside, UK, 26 - 31 Aug 2000, pp.154-159 - Please contact the library if you need to access this document.
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6.
(44)
Photonic events with missing energy in $e^{+}e^{-}$ collisions at $\sqrt{s}=189 GeV$ / OPAL Collaboration
Photonic events with large missing energy have been observed in e+e- collisions at a centre-of-mass energy of 189GeV using the OPAL detector at LEP. Results are presented for event topologies consistent with a single photon or with an acoplanar photon pair. [...]
hep-ex/0005002; CERN-EP-2000-050; CERN-EP-2000-050.- Geneva : CERN, 2000 - 42 p. - Published in : Eur. Phys. J. C 18 (2000) 253-272 Fulltext: 0005002 - PDF; arXiv:hep-ex_0005002 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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7.
(42)
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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8.
(41)
Search for SUSY with R-parity violating $LL\overline{E}$ couplings at $\sqrt{s}$=189 GeV / DELPHI Collaboration
Searches for pair production of supersymmetric particlesunder the assumption that $R$--parity is not conserved are presented,based on data recorded by the DELPHI detector in 1998from e$^{+}$e$^{-}$ collisions at a centre-of-mass energy of189~GeV. Only one $R$--parity violating $\rm{LL} \bar{\rm E}$term (i.e [...]
hep-ex/0103006; CERN-EP-2000-059; CERN-EP-2000-059.- Geneva : CERN, 2000 - 18 p. - Published in : Phys. Lett. B 487 (2000) 36-52 Fulltext: arXiv:hep-ex_0103006 - PDF; ep-2000-059 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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9.
(41)
Search for R-parity violation with a $\overline{U}\overline{D}\overlin e{D}$ coupling at $\sqrt{s}$=189 GeV / DELPHI Collaboration
Searches for pair production of gauginos and squarks in $e^{+} e^{-}$ collisions at a centre-of-mass energy of 189 GeV have been performed on data corresponding to an integrated luminosity of 158 pb$^{-1}$ collected by the DELPHI detector at LEP. The data were analyzed under the assumption of non-conservation of \mbox{$R$-parity} through a single dominant $\bar{U} \bar{D} \bar{D}$~coupling between squarks and quarks. [...]
hep-ex/0103015; CERN-EP-2000-127; CERN-EP-2000-127.- Geneva : CERN, 2001 - 20 p. - Published in : Phys. Lett. B 500 (2001) 22-36 Fulltext: arXiv:hep-ex_0103015 - PDF; cer-2234586 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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10.
(39)
Measurement of the Charm structure Function $F_{2}^{\gamma},c$ of the Photon at LEP / OPAL Collaboration
The production of charm quarks is studied in deep-inelastic electron-photon scattering using data recorded by the OPAL detector at LEP at normal e+e- centre-of-mass energies from 183 to 209 GeV. The charm quarks have been identified by full reconstruction of charged D* mesons using their decays into D0pi with the D0 observed in two decay modes with charged particle final states, Kpi and K3pi. [...]
hep-ex/0206021; CERN-EP-2002-031; CERN-EP-2002-031.- Geneva : CERN, 2002 - 19 p. - Published in : Phys. Lett. B 539 (2002) 13-24 Fulltext: arXiv:hep-ex_0206021 - PDF; ep-2002-031 - PDF; ep-2002-031_pr354 - PS.GZ; External link: Preprint - Please contact the library if you need to access this document.
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