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CERN Document Server Sök i 2,048 journaler efter:  1 - 10nästaslut  gå till journal: Sökningen tog 1.44 sekunder. 
1.
(100)
Hard-Photon Production and Tests of QED at LEP / L3 Collaboration
The total and differential cross sections of the process $\epem \ra n \gamma$ with $n \geq 2$ are measuredusing data collected by the L3 experiment at centre--of--mass energies of $\sqrt{s}=183$ and $189$\GeV{}. The results are in agreement with the Standard Model expectations. [...]
hep-ex/0002036; CERN-EP-99-180; CERN-EP-99-180; CERN-L3-198.- Geneva : CERN, 2000 - 12 p. - Published in : Phys. Lett. B 475 (2000) 198-205 Fulltext: ep-1999-180 - PS.GZ; arXiv:hep-ex_0002036 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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2.
(91)
Measurement of Bose-Einstein Correlations in $e^{+}e^{-}\to W^{+}W^{-}$ Events at LEP / L3 Collaboration
Bose-Einstein correlations in W-pair production at LEP are investigated in a data sample of 629 pb$^{-1}$ collected by the L3 detector at $\sqrt{s}=$ 189--209\,GeV. Bose-Einstein correlations between pions within a W decay are observed and found to be in good agreement with those in light-quark Z decay. [...]
hep-ex/0209016; CERN-EP-2002-062; CERN-EP-2002-062; CERN-L3-257.- Geneva : CERN, 2002 - 16 p. - Published in : Phys. Lett. B 547 (2002) 139-150 Fulltext: arXiv:hep-ex_0209016 - PDF; ep-2002-062 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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3.
(91)
Search for Heavy Neutral and Charged Leptons in $e^+ e^-$ Annihilation at $\sqrt{s}$= 183 GeV and 189 GeV / L3 Collaboration
A search for unstable neutral and charged heavy leptons as well as for stable charged heavy leptons is performed at center-of-mass energies $\sqrt{s}$ = 183 and 189 GeV with the L3 detector at LEP. No evidence for their existence is found. [...]
hep-ex/9909007; CERN-EP-99-075; CERN-EP-99-75; CERN-EP-99-075; CERN-L3-177.- Geneva : CERN, 1999 - 15 p. - Published in : Phys. Lett. B 462 (1999) 354-64 Fulltext: ep-99-075 - PDF; arXiv:hep-ex_9909007 - PDF; - Please contact the library if you need to access this document.
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4.
(90)
Search for an invisibly decaying Higgs boson in $e^{+} e^{-}$ collisions at $\sqrt{s}$ = 183-189 GeV / L3 Collaboration
A search for a Higgs boson decaying into invisible particles is performed using the datacollected at LEP by the L3 experiment at centre-of-mass energies of$183\gev{}$ and $189\gev{}$. The integrated luminosities are respectively 55.3~\pb{} and 176.4~\pb{}.The observed candidates are consistent with the expectations from StandardModel processes.In the hypothesis that the production cross section of this Higgs bosonequals the Standard Model one and the branching ratio into invisibleparticles is $100\%$, a lower masslimit of $89.2\gev{}$ is set at $95\%$ confidence level..
hep-ex/0004006; CERN-EP-2000-047; CERN-EP-2000-047; CERN-L3-206.- Geneva : CERN, 2000 - 15 p. - Published in : Phys. Lett. B 485 (2000) 85-94 Fulltext: arXiv:hep-ex_0004006 - PDF; ep-2000-047 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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5.
(90)
Study of the $e^{+}e^{-}\to Ze^{+}e^{-}$ Process at LEP / L3 Collaboration
The cross section of the process $\rm e^+e^-\rightarrow Ze^+e^-$ is measured with ~0.7\,fb$^{-1}$ of data collected with the L3 detector at LEP. Decays of the Z boson into quarks and muons are considered at centre-of-mass energies ranging from $183$ GeV up to $209$ GeV. [...]
hep-ex/0303041; CERN-EP-2002-103; CERN-EP-2002-103; CERN-L3-263.- Geneva : CERN, 2003 - 12 p. - Published in : Phys. Lett. B 561 (2003) 73-81 Fulltext: ep-2002-103 - PDF; S0370269303004064 - XML; arXiv:hep-ex_0303041 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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6.
(87)
Measurement of the $e^{+}e^{-} \to Z\gamma\gamma$ Cross Section and Determination of Quartic Gauge Boson Couplings at LEP / L3 Collaboration
A first measurement of the cross section of the process$\rm e^+e^-\rightarrow Z\gamma\gamma$ is reported using a total integrated luminosity of 231\,pb$^{-1}$collected with the L3 detector at centre-of-mass energiesof 182.7\,GeV and 188.7\,GeV. By selectinghadronic events with two isolated photonsthe $\rm e^+e^-\rightarrow Z\gamma\gamma$cross section is measured to be$ 0.49^{+0.20}_{-0.17}\pm0.04\,{\mathrm{pb}}$ at 182.7\,GeV and $0.47 \pm 0.10\pm0.04\,{\mathrm{pb}}$ at 188.7\,GeV. [...]
hep-ex/0002037; CERN-EP-2000-006; CERN-EP-2000-006; CERN-L3-199.- Geneva : CERN, 2000 - 14 p. - Published in : Phys. Lett. B 478 (2000) 39-49 Fulltext: ep-2000-006 - PS.GZ; arXiv:hep-ex_0002037 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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7.
(86)
Search for Excited Leptons at $\sqrt{s}$= 189 GeV / L3 Collaboration
A search for excited leptons, $\rm e^*,~\mu^*, ~\tau^*, ~\nu_e^*, ~\nu_{\mu}^*$ and $\nu_{\tau}^*$, was performed with the L3 detector at LEP using data collected at a centre--of--mass energy of 189 GeV, corresponding to an integrated luminosity of $\rm 176~pb^{-1}$. No evidence of their production is observed. [...]
hep-ex/9910021; CERN-EP-99-138; CERN-EP-99-138; CERN-L3-191.- Geneva : CERN, 2000 - 14 p. - Published in : Phys. Lett. B 473 (2000) 177-185 Fulltext: ep-99-138 - PDF; arXiv:hep-ex_9910021 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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8.
(86)
Higgs Candidates in $e^{+}e^{-}$ Interactions at $\sqrt{s}$ = 206.6 GeV / L3 Collaboration
In a search for the Standard Model Higgs boson, carried out on 212.5 pb-1 of data collected by the L3 detector at the highest LEP centre-of-mass energies, including 116.5 pb-1 above root(s) = 206GeV, an excess of candidates for the process e+e- -> Z* -> HZ is found for Higgs masses near 114.5GeV. We present an analysis of our data and the characteristics of our strongest candidates..
hep-ex/0011043.- Geneva : CERN, 2000 - Published in : Phys. Lett. B 495 (2000) 18-25 Access to fulltext document: PDF; External link: hep-ex/0011043 PDF
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9.
(85)
ZZ production in $e^{+}e^{-}$ interactions at $\sqrt{s}$ = 183 - 209 GeV / DELPHI Collaboration
Measurements of on-shell ZZ production are described, using data from the DELPHI experiment at LEP in e+e- collisions at centre-of-mass energies between 183 and 209 GeV, corresponding to an integrated luminosity of about 665 pb^{-1}. Results obtained in each of the final states q anti-q q anti-q, nu anti-nu q anti-q, mu+ mu- q anti-q, e+ e- q anti-q, tau+ tau- q anti-q, l+ l- l+ l-, and nu anti-nu l+ l- (with l=e,mu) are presented. [...]
hep-ex/0307050; CERN-EP-2003-009; CERN-EP-2003-009.- Geneva : CERN, 2003 - 35 p. - Published in : Eur. Phys. J. C 30 (2003) 447-466 Fulltext: 0307050 - PDF; arXiv:hep-ex_0307050 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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10.
(85)
Compton Scattering of Quasi-Real Virtual Photons at LEP / L3 Collaboration
Compton scattering of quasi-real virtual photons, gamma e+- -> gamma e+-, is studied with 0.6fb-1 of data collected by the L3 detector at the LEP e+e- collider at centre-of-mass energies root(s')=189-209GeV. About 4500 events produced by the interaction of virtual photons emitted by e+- of one beam with e-+ of the opposite beam are collected for effective centre-of-mass energies of the photon-electron and photon-positron systems in the range from root(s')= 35GeV up to root(s')=175GeV, the highest energy at which Compton scattering was ever probed. [...]
hep-ex/0504012; CERN-PH-EP-2005-011; CERN-L3-298; CERN-PH-EP-2005-011.- Geneva : CERN, 2005 - 19 p. - Published in : Phys. Lett. B 616 (2005) 145-158 Fulltext: arXiv:hep-ex_0504012 - PDF; cer-002518146 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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