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CERN Document Server 176 εγγραφές βρέθηκαν  1 - 10επόμενοτέλος  μετάβαση στην εγγραφή: Η έρευνα πήρε 0.49 δευτερόλεπτα. 
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
2.
Photon structure functions and azimuthal correlations of lepton pairs in tagged γγ 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.
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 199395.A total luminosity of 103 pb1 was collected at centre-of-mass energies smZ and smZ±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 199092,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 Γinv=499.1±2.9 MeV is derived which in the Standard Model yields for the numberof light neutrino species Nν=2.978±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 ˉgV=0.0397±0.0017 and ˉgA=0.50153±0.00053.Including our measurements of the Z bˉb forward-backward and quark charge asymmetries a value for the effective electroweakmixing angle of sin2¯θW=0.23093±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.
4.
Search for Charginos with a Small Mass Difference to the Lightest Supersymmetric Particle at s=189GeV / L3 collaboration
A search for charginos nearly mass-degenerate with the lightestsupersymmetric particle isperformed using the 176 {pb1 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.
5.
Measurement of the e+eZγγ Cross Section and Determination of Quartic Gauge Boson Couplings at LEP / L3 Collaboration
A first measurement of the cross section of the processe+eZγγ is reported using a total integrated luminosity of 231\,pb1collected with the L3 detector at centre-of-mass energiesof 182.7\,GeV and 188.7\,GeV. By selectinghadronic events with two isolated photonsthe e+eZγγcross section is measured to be0.49+0.200.17±0.04pb at 182.7\,GeV and 0.47±0.10±0.04pb 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.
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 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 areα1(2.1GeV2)α1(6.25GeV2)=0.78±0.26α1(12.25GeV2)α1(3434GeV2)=3.80±1.29,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.
7.
Hard-Photon Production and Tests of QED at LEP / L3 Collaboration
The total and differential cross sections of the process \epem\ranγ with n2 are measuredusing data collected by the L3 experiment at centre--of--mass energies of 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.
8.
Measurement of Hadron and Lepton-Pair Production at 130 GeV <s< 189 GeV at LEP / L3 Collaboration
We report on measurements of 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~pb1, 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.
9.
Direct Observation of Longitudinally Polarised W± Bosons / L3 Collaboration
The three different helicity states of W bosons, produced in the reaction e+eW+Wνq¯qare studied using leptonic and hadronic W decaysat 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.
10.
Measurement of the Probability of Gluon Splitting into Charmed Quarks in Hadronic Z Decays / L3 Collaboration
We have measured the probability, ¯ngc¯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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