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CERN Document Server 143 records found  1 - 10nextend  jump to record: Search took 0.60 seconds. 
1.
Measurement of muon-pair production with the L3 experiment / Robohm, Arne
This thesis reports on measurements of $\rm e\sp+e\sp-$ annihilation into muon pairs with the L3 detector at LEP [...]
Zürich : Zurich, ETH, 1998. - 120 p.

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2.
Precision electroweak measurements on the $Z$ resonance / ALEPH Collaboration
We report on the final electroweak measurements performed with data taken at the Z resonance by the experiments operating at the electron-positron colliders SLC and LEP. The data consist of 17 million Z decays accumulated by the ALEPH, DELPHI, L3 and OPAL experiments at LEP, and 600 thousand Z decays by the SLD experiment using a polarised beam at SLC. [...]
hep-ex/0509008; SLAC-R-774; CERN-PH-EP-2005-041; SLAC-R-774; CERN-L3-304.- Geneva : CERN, 2006 - 302 p. ALEPH Papers - Published in : Phys. Rep. 427 (2006) 257 Fulltext: phep-2005-041 - PDF; arXiv:hep-ex_0509008 - PDF; External link: SLAC Document Server
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3.
Measurements of the $b\overline{b}$ production cross section and forward-backward asymmetry at centre-of-mass energies above the Z pole at LEP / L3 Collaboration
The measurements of R/sub b/= sigma (e/sup +/e/sup -/ to bb)/ sigma (e/sup +/e/sup -/ to qq) and of the b quark forward-backward charge asymmetry, A/sub fb//sup b/, at centre-of-mass energies above the Z pole are described. The measurement of R/sub b/ is performed at square root (s) between 130 and 189 GeV using a b-tagging method that exploits the relatively large decay length of b-hadrons. [...]
Geneva : CERN, 2000 - Published in : Phys. Lett. B 485 (2000) 71-84
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4.
Production of Single W Bosons at $\sqrt{s}$ = 189 GeV and Measurement of WW$\gamma$ Gauge Couplings / L3 Collaboration
Single W boson production in electron-positron collisions is studied with the L3 detector at LEP. The data sample collected at a centre-of-mass energy of $\sqrt{s} = 188.7 \mathrm{\ Ge\kern -0.1em V}{}$ corresponds to an integrated luminosity of $176.4\,\mbox{pb$^{-1}$}$. [...]
hep-ex/0007005; CERN-EP-2000-066; CERN-EP-2000-066; CERN-L3-212.- Geneva : CERN, 2000 - 17 p. - Published in : Phys. Lett. B 487 (2000) 229-240 Fulltext: ep-2000-066 - PDF; arXiv:hep-ex_0007005 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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5.
Search for Manifestations of New Physics in Fermion-Pair Production at LEP / L3 Collaboration
The measurements of hadron and lepton-pair production cross sections and leptonic forward-backward asymmetries performed with the L3 detector at centre-of-mass energies between 130 GeV and 189 GeV are used to search for new physics phenomena such as: contact interactions, exchange of virtual leptoquarks, scalar quarks and scalar neutrinos, effects of TeV strings in models of quantum gravity with large extra dimensions and non-zero sizes of the fermions. No evidence for these phenomena is found and new limits on their parameters are set..
hep-ex/0005028; CERN-EP-2000-061; CERN-EP-2000-061; CERN-L3-211.- Geneva : CERN, 2000 - 18 p. - Published in : Phys. Lett. B 489 (2000) 81-92 Fulltext: 0005028 - PDF; arXiv:hep-ex_0005028 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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6.
QCD studies in $e^{+}e^{-}$ annihilation from 30 GeV to 189 GeV / L3 Collaboration
We present results obtained from a study of the structure of hadronic events recorded by the L3 detector at various centre-of-mass energies.The distributions of event shape variables and the energy dependence of their mean values are measured from 30 GeV to 189 GeV and compared with various QCD models. The energy dependence of the moments of event shape variables is used to test a power law ansatz for the non-perturbativecomponent [...]
hep-ex/0005045; CERN-EP-2000-064; CERN-EP-2000-064; CERN-L3-210.- Geneva : CERN, 2000 - 23 p. - Published in : Phys. Lett. B 489 (2000) 65-80 Fulltext: arXiv:hep-ex_0005045 - PDF; ep-2000-064 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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7.
Search for Anomalous $ZZ\gamma$ and $Z\gamma\gamma$ couplings in the process $e^{+}e^{-} \to Z\gamma$ at LEP / L3 Collaboration
We search for anomalous trilinear gauge couplings in the ${\rm ZZ}\gamma$ and ${\rm Z}\gamma\gamma$ vertices using data collected with the L3 detectorat LEP at a centre--of--mass energy $\sqrt{s}=189$ GeV. No evidence is found and limits on these couplings and on new physics scales are derived from the analysis of the process ${\rm e}^{+}{\rm e}^{-} \rightarrow {\rm Z} \gamma$..
hep-ex/0005024; CERN-EP-2000-057; CERN-EP-2000-057; CERN-L3-208.- Geneva : CERN, 2000 - 17 p. - Published in : Phys. Lett. B 489 (2000) 55-64 Fulltext: ep-2000-057 - PDF; arXiv:hep-ex_0005024 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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8.
Measurements of the $b\overline{b}$ production cross section and forward- backward asymmetry at centre-of-mass energies above the Z pole at LEP / L3 Collaboration
The measurements of $R_{b} = \sigma(e^+e^-} \to b\overline{b})/\sigma( e^+e^-} \to{m q\overline{q})$ and of the b quarkforward--backward charge asymmetry,$A_fb}^{b}$, at centre--of--mass energies above the Z pole are described. The measurement of $R_{b}$ is performed at $\sqrt{s}$ between 130 and 189 GeV using a b--tagging method thatexploits the relatively large decay length ofb--hadrons [...]
hep-ex/0005023; CERN-EP-2000-054; CERN-EP-2000-054; CERN-L3-207.- Geneva : CERN, 2000 - 22 p. - Published in : Phys. Lett. B 485 (2000) 71-84 Fulltext: arXiv:hep-ex_0005023 - PDF; ep-2000-054 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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9.
Photon structure functions and azimuthal correlations of lepton pairs in tagged $\gamma\gamma$ collisions / L3 Collaboration
Measurements of the QED structure of the photon based on the reaction ee to ee gamma /sup (*)/(P/sup 2/) gamma *(Q/sup 2/) to ee mu mu are discussed. This review is an update of the discussion of the results on the QED structure of the photon and covers the published measurements of the photon structure functions F/sub 2//sup gamma /, F/sub A//sup gamma / and F/sub B//sup gamma / and of the differential cross-section d sigma /dx for the exchange of two virtual photons. [...]
CERN-EP-98-060; CERN-L3-147.- Geneva : CERN, 1998 - Published in : Phys. Lett. B 438 (1998) 363 Fulltext: PDF; - Please contact the library if you need to access this document.
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10.
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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