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CERN Document Server 176 registres trobats  1 - 10següentfinal  anar al registre: La cerca s'ha fet en 0.59 segons. 
1.
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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2.
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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3.
Measurements of Cross Sections and Forward-Backward Asymmetries at the Z Resonance and Determination of Electroweak Parameters / L3 collaboration
We report on measurements of hadronic and leptonic cross sections and leptonic forward-backward asymmetries performed with the L3 detector in the years $1993-95$.A total luminosity of 103 pb$^{-1}$ was collected at centre-of-mass energies $\sqrt{s} \approx m_\mathrm{Z}$ and $\sqrt{s} \approx m_\mathrm{Z} \pm 1.8$ GeVwhich corresponds to 2.5 million hadronic and 245 thousand leptonic events selected.These data lead to a significantly improved determination of Z parameters.From the total cross sections, combined with our measurements in $1990-92$,we obtain the final results:%%%\begin{eqnarr ay*} m_\mathrm{Z} = 91189.8 \pm 3.1\ \mathrm{MeV} \, , & & \Gamma_\mathrm{Z} = 2502.4 \pm 4.2\ \mathrm{MeV} \, , \\ \Gamma_\mathrm{had} = 1741.1 \pm 3.8\ \mathrm{MeV} \, , & & \Gamma_\ell = 84.14 \pm 0.17\ \mathrm{MeV} \,. \label{eq:Zpara_abstract}\end{eqnarray*}%%%An invisible width of $\Gamma_\mathrm{inv} = 499.1 \pm 2.9$ MeV is derived which in the Standard Model yields for the numberof light neutrino species $N_\nu = 2.978 \pm 0.014$.Adding our results on the leptonic forward-backward asymmetries and thetau polarisation, the effective vector and axial-vector coupling constants of the neutral weak current to charged leptons are determined to be $\bar{g}_{\mathrm{V}}^\ell = -0.0397\pm 0.0017$ and $\bar{g}_{\mathrm{A}}^\ell = -0.50153 \pm 0.00053$.Including our measurements of the Z $\rightarrow \mathrm{b}\bar{\mathrm{b}}$ forward-backward and quark charge asymmetries a value for the effective electroweakmixing angle of $\sin^2\!\overline{\theta}_{\mathrm{W}} = 0.23093 \pm 0.00066$ is derived. [...]
hep-ex/0002046; CERN-EP-2000-022; CERN-EP-2000-022; CERN-L3-202.- Geneva : CERN, 2000 - 97 p. - Published in : Eur. Phys. J. C 16 (2000) 1-40 Fulltext: ep-2000-022 - PDF; arXiv:hep-ex_0002046 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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4.
Search for Charginos with a Small Mass Difference to the Lightest Supersymmetric Particle at $\sqrt{s} = 189 GeV$ / L3 collaboration
A search for charginos nearly mass-degenerate with the lightestsupersymmetric particle isperformed using the 176 {pb$^{-1}$ of data collected at 189 {Ge\kern -0.1em V} in 1998 with the L3detector. Mass differences between the chargino and the lightest supersymmetric particlebelow 4 {Ge\kern -0.1em V} are considered.The presence of a high transverse momentum photon is required to single out the signal from the photon-photon interaction background. [...]
hep-ex/0002043; CERN-EP-2000-018; CERN-EP-2000-018; CERN-L3-201.- Geneva : CERN, 2000 - 19 p. - Published in : Phys. Lett. B 482 (2000) 31-42 Fulltext: ep-2000-018 - PDF; arXiv:hep-ex_0002043 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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5.
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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6.
Measurement of the Running of the Fine-Structure Constant / L3 Collaboration
Small-angle Bhabha scattering data recorded at the Z resonance and large-angleBhabha scattering data recorded at $\sqrt{s} = 189$ \textrm{Ge\kern -0.1em V} bythe L3 detector at LEP are used to measure the running of the effective fine-structure constant for spacelike momentum transfers. The results are\begin{eqnarray*} \alpha^{-1}(-2.1 \mathrm{Ge\kern -0.1em V}^{2}) - \alpha^{-1}(-6.25 \mathrm{Ge\kern -0.1em V}^{2}) & = & 0.78 \pm 0.26 \\ \alpha^{-1}(-12.25 \mathrm{Ge\kern -0.1em V}^{2}) - \alpha^{-1}(-3434 \mathrm{Ge\kern -0.1em V}^{2}) & = & 3.80 \pm 1.29, \\\end{eqnarray*}in agreement with theoretical predictions..
hep-ex/0002035; CERN-EP-2000-005; CERN-EP-2000-005; CERN-L3-197.- Geneva : CERN, 2000 - 13 p. - Published in : Phys. Lett. B 476 (2000) 40-8 Fulltext: arXiv:hep-ex_0002035 - PDF; ep-2000-005 - PS.GZ; External link: Preprint - Please contact the library if you need to access this document.
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7.
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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8.
Measurement of Hadron and Lepton-Pair Production at 130 GeV $ < \sqrt{s} < $ 189 GeV at LEP / L3 Collaboration
We report on measurements of $\mathrm{e^{+}e^{-}}$ annihilation into hadronsand lepton pairs.The data have been collected with the L3 detector at LEP at centre-of-massenergies between 130 and 189~\textrm{Ge\kern -0.1em V}.Using a total integrated luminosity of 243.7~pb$^{-1}$, 25864 hadronic and 8573lepton-pair events are selected for the measurement of cross sections and leptonicforward-backward asymmetries. The results are in good agreement with Standard Model predictions..
hep-ex/0002034; CERN-EP-99-181; CERN-EP-99-181; CERN-L3-196.- Geneva : CERN, 2000 - 24 p. - Published in : Phys. Lett. B 479 (2000) 101-117 Fulltext: ep-1999-181 - PS.GZ; arXiv:hep-ex_0002034 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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9.
Direct Observation of Longitudinally Polarised $W^{\pm}$ Bosons / L3 Collaboration
The three different helicity states of W bosons, produced in the reaction $e^+e^- \rightarrow W^+W^- \rightarrow \ell \nu q \overline{q}$are studied using leptonic and hadronic W decaysat $\sqrt{s}$ = 183 GeV and 189 GeV. The W polarisation is also measured as a function of the scattering angle between the $W^-$ and the direction of the $e^-$ beam. [...]
hep-ex/0001016; CERN-EP-99-176; CERN-EP-99-176; CERN-L3-195.- Geneva : CERN, 2000 - 17 p. - Published in : Phys. Lett. B 474 (2000) 194-204 Fulltext: ep-99-176 - PDF; arXiv:hep-ex_0001016 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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10.
Measurement of the Probability of Gluon Splitting into Charmed Quarks in Hadronic Z Decays / L3 Collaboration
We have measured the probability, $\overline{n}_{\rm{g} \rightarrow c\overline{c}}$, of a gluon splitting into a charm-quark pair using 1.7 million hadronic Z decays collected by the L3 detector. Two independent methods have been applied to events with a three-jet topology. [...]
hep-ex/9911016; CERN-EP-99-156; CERN-EP-99-156; CERN-L3-194.- Geneva : CERN, 2000 - 19 p. - Published in : Phys. Lett. B 476 (2000) 243-55 Fulltext: ep-99-156 - PDF; arXiv:hep-ex_9911016 - PDF; External link: DURHAM - Please contact the library if you need to access this document.
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CERN Document Server : 176 registres trobats   1 - 10següentfinal  anar al registre:
Vegeu també: autors amb noms similars
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8 Ball, Robert
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1 Ball, Rudi
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