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CERN Document Server Encontrados 2,049 registros  1 - 10siguientefinal  ir al registro: La búsqueda tardó 1.26 segundos. 
1.
(100)
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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2.
(91)
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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3.
(81)
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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4.
(71)
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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5.
(71)
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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6.
(62)
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.
(62)
Study of Triple-Gauge-Boson Couplings ZZZ, ZZ$\gamma$ and Z$\gamma\gamma$ at LEP / DELPHI Collaboration
Neutral triple-gauge-boson couplings ZZZ, ZZgam and Zgamgam have been studied with the DELPHI detector using data at energies between 183 and 208 GeV. Limits are derived on these couplings from an analysis of the reactions e+e- -> Zgam, using data from the final states gamma f fbar, with f = q or neutrino, from e+e- -> ZZ, using data from the four-fermion final states q qbar q qbar, q qbar mu+ mu-, q qbar e+ e-, q qbar nu nubar, mu+ mu- nu nubar and e+ e- nu nubar, and from e+e- -> Zgam*, in which the final state gamma is off mass-shell, using data from the four-fermion final states q qbar e+ e- and q qbar mu+ mu-. [...]
arXiv:0706.2741; HEP-PH-EP-2006-008; CERN-PH-EP-2006-008.- Geneva : CERN, 2007 - 29 p. - Published in : Eur. Phys. J. C 51 (2007) 525-542 Fulltext: PDF; External link: Fulltext
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8.
(59)
Search for anomalous couplings in the Higgs sector at LEP / L3 Collaboration
We search for a Higgs particle with anomalous couplings in the $\mathrm{e}^+\mathrm{e}^-\rightarrow\mathrm{H}\gamma$, $\mathrm{e}^+\mathrm{e}^-\rightarrow\mathrm{H}\mathrm{Z}$ and $\mathrm{e}^+\mathrm{e}^-\rightarrow\mathrm{H}\mathrm{e}^+\mathrm{e }^-$ processes with the L3 detector at LEP. We explore the mass range $70~{\rm GeV} < m_\mathrm{H} < 170~{\rm GeV}$ using $176~{\rm pb}^{-1}$ of integrated luminosity at a center-of-mass energy of $\sqrt{s} = 189~{\rm GeV}$. [...]
hep-ex/0008023; CERN-EP-2000-098; CERN-EP-2000-098; CERN-L3-216.- Geneva : CERN, 2000 - 18 p. - Published in : Phys. Lett. B 489 (2000) 102-14 Fulltext: ep-2000-098 - PDF; arXiv:hep-ex_0008023 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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9.
(59)
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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10.
(58)
Photon Events with Missing Energy in $e^{+}e^{-}$ Collisions at $\sqrt{s}$ = 130 to 209 GeV / DELPHI Collaboration
The production of single- and multi-photon events has been studied in the reaction e+e- -> gamma (gamma) + invisible particles. The data collected with the DELPHI detector during the years 1999 and 2000 at centre-of-mass energies between 191 GeV and 209 GeV was combined with earlier data to search for phenomena beyond the Standard Model. [...]
hep-ex/0406019; CERN-EP-2003-093; CERN-EP-2003-093.- Geneva : CERN, 2005 - 33 p. - Published in : Eur. Phys. J. C 38 (2005) 395-411 Fulltext: arXiv:hep-ex_0406019 - PDF; 0406019 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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