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CERN Document Server 2,041 záznamov nájdených  1 - 10ďalšíkoniec  skoč na záznam: Hľadanie trvalo 1.37 sekúnd. 
1.
(100)
An upper limit on the anomalous magnetic moment of the $\tau$ lepton / OPAL Collaboration
Using radiative Z^0 -> \tau^+ \tau^- \gamma events collected with the OPAL detector at LEP at \sqrt{s}= M_Z during 1990-95, a direct study of the electromagnetic current at the \tau\gamma vertex has been performed in terms of the anomalous magnetic form factor F_2 of the \tau lepton. The analysis is based on a data sample of 1429 e^+ e^- -> \tau^+ \tau^- \gamma events which are examined for a deviation from the expectation with F_2 = 0. [...]
hep-ex/9803020; CERN-EP-98-033; CERN-EP-98-033.- Geneva : CERN, 1998 - 19 p. - Published in : Phys. Lett. B 431 (1998) 188 Fulltext: arXiv:hep-ex_9803020 - PDF; 9803020 - PDF; ep-98-033 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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2.
(91)
Muon-Pair and Tau-Pair Production in Two-Photon Collisions at LEP / L3 Collaboration
The QED processes e^+ e^- -> e^+ e^- \mu^+ \mu^- and e^+ e^- -> e^+ e^- \tau^+ \tau^- are studied with the L3 detector at LEP using an untagged data sample collected at centre-of-mass energies 161 GeV < sqrt{s} < 209 GeV. The tau-pairs are observed through the associated decay of one tau into e\nu\nu and the other into \pi\pi\nu . [...]
hep-ex/0402037; CERN-EP-2003-080; CERN-EP-2003-080; CERN-L3-281.- Geneva : CERN, 2004 - 10 p. - Published in : Phys. Lett. B 585 (2004) 53-62 Fulltext: arXiv:hep-ex_0402037 - PDF; 0402037 - PDF; External links: Fulltext; Rivet analyses reference - Please contact the library if you need to access this document.
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3.
(81)
Measurement of the one-prong hadronic $\tau$ branching ratios at LEP / OPAL Collaboration
The branching ratios of the \tau^- -> h^- \nu_\tau, \tau^- -> h^- \pi^0 \nu_\tau, \tau^- -> h^- >=2 \pi^0 \nu_\tau decays have been measured using the 1991-1995 data recorded with the OPAL detector at LEP. These branching ratios are measured simultaneously using three selection criteria and are found to be BR(\tau^- -> h^- \nu_\tau) = (11.98 +/- 0.13 +/- 0.16)% BR(\tau^- -> h^- \pi^0 \nu_\tau) = (25.89 +/- 0.17 +/- 0.29)% BR(\tau^- -> h^- >=2 \pi^0 \nu_\tau) = ( 9.91 +/- 0.31 +/- 0.27)% where the first error is statistical and the second is systematic..
hep-ex/9801029; CERN-PPE-97-152; CERN-PPE-97-152.- Geneva : CERN, 1998 - 23 p. - Published in : Eur. Phys. J. C 4 (1998) 193-206 Fulltext: arXiv:hep-ex_9801029 - PDF; 9801029 - PDF; ppe-97-152 - PDF; External link: hep-ex/9801029 PDF - Please contact the library if you need to access this document.
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4.
(77)
Study of Tau-pair Production in Photon-Photon Collisions at LEP and Limits on the Anomalous Electromagnetic Moments of the Tau Lepton / DELPHI Collaboration
Tau-pair production in the process e+e- -> e+e-tau+tau- was studied using data collected by the DELPHI experiment at LEP2 during the years 1997 - 2000. The corresponding integrated luminosity is 650 pb^{-1}. [...]
hep-ex/0406010; CERN-EP-2003-058; CERN-EP-2003-058.- Geneva : CERN, 2004 - 20 p. - Published in : Eur. Phys. J. C 35 (2004) 159-170 Fulltext: 0406010 - PDF; arXiv:hep-ex_0406010 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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5.
(76)
Determination of the $e^+ e^- \to \gamma \gamma (\gamma)$ cross-section at LEP 2 / DELPHI Collaboration
A test of the benchmark QED process e+e- -> gamma gamma (gamma) is reported, using the data collected with the DELPHI detector at LEP 2. The data analysed were recorded at centre-of-mass energies ranging from 161 GeV to 208 GeV and correspond to a total integrated luminosity of 656.4 pb^{-1}. [...]
hep-ex/0409058; CERN-PH-EP-2004-017; CERN-PH-EP-2004-017.- Geneva : CERN, 2004 - 24 p. - Published in : Eur. Phys. J. C 37 (2004) 405-419 Fulltext: arXiv:hep-ex_0409058 - PDF; 0409058 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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6.
(75)
Measurement of the $B^0_s$ Lifetime and Study of $B^0_s - \overline{B^0_s}$ Oscillations using $D_{s}l$ Events / DELPHI Collaboration
Lifetime and oscillations of $\Bs$ mesons have been studied in eventswith a large transverse momentum lepton and a $\Ds$ of opposite electric charge>the same hemisphere, selected from about 3.6 million hadronic $\Zz$decays accumulated by DELPHI between 1992 and 1995. \\The $\Bs$ lifetime and the fractional width difference between the two physical>
hep-ex/0107077; CERN-EP-2000-043; CERN-EP-2000-043.- Geneva : CERN, 2000 - 47 p. - Published in : Eur. Phys. J. C 16 (2000) 555-578 Fulltext: ep-2000-043 - PDF; arXiv:hep-ex_0107077 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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7.
(74)
Measurement of the $e^+ e^- \to W^+ W^-\gamma$ Cross-section and Limits on Anomalous Quartic Gauge Couplings with DELPHI / DELPHI Collaboration
W+W-gamma production at LEP2 is studied using data collected with the DELPHI detector at centre-of-mass energies between 189 GeV and 209 GeV, corresponding to an integrated luminosity of about 600 pb^-1. Cross-sections are measured for the production of W+W- with a hard, central and isolated photon in the final state, and are found to be compatible with the Standard Model prediction. [...]
hep-ex/0311004; CERN-EP-2003-045; CERN-EP-2003-045.- Geneva : CERN, 2003 - 14 p. - Published in : Eur. Phys. J. C 31 (2003) 139-147 Fulltext: 0311004 - PDF; arXiv:hep-ex_0311004 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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8.
(72)
The $e^+ e^- \to Z\gamma\gamma \to q\overline{q}\gamma\gamma$ Reaction at LEP and Constraints on Anomalous Quartic Gauge Boson Couplings / L3 Collaboration
The cross section of the process e^+ e^- -> Z \gamma\gamma -> qq~ \gamma \gamma is measured with 215 pb^-1 of data collected with the L3 detector during the final LEP run at centre-of-mass energies around 205 GeV and 207 GeV. No deviation from the Standard Model expectation is observed. [...]
hep-ex/0206050; CERN-EP-2002-034; CERN-EP-2002-034; CERN-L3-255.- Geneva : CERN, 2002 - 14 p. - Published in : Phys. Lett. B 540 (2002) 43-51 Fulltext: ep-2002-034_title - PS.GZ; ep-2002-034 - PDF; arXiv:hep-ex_0206050 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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9.
(71)
Search for sleptons in $e^+ e^-$ collisions at $\sqrt{s}$= 183 to 189 GeV / DELPHI Collaboration
Data taken by the {\tt DELPHI} experiment at centre-of-mass energies of 183~\GeV\ and 189~\GeV\ with a total integrated luminosity of 212 pb$^{-1} have been used to search for the supersymmetric partners of the electrons, muons, and taus in the context of the Minimal Supersymmetric Standard Model (MSSM). The decay topologies searched for were the direct decay ({\tilde \ell} -> \ell {\tilde\chi_1^0}), producing acoplanar lepton pairs plus missing energy, and the cascade decay ({\tilde \ell} -> \ell {\tilde \chi_2^0} -> \ell\gamma {\tilde \chi_1^0}), producing acoplanar lepton and photon pairs plus missing energy. [...]
hep-ex/0104007; CERN-EP-2000-134; CERN-EP-2000-134.- Geneva : CERN, 2001 - 25 p. - Published in : Eur. Phys. J. C 19 (2001) 29-42 Fulltext: cer-002267693 - PDF; ep-2000-134 - PS.GZ; arXiv:hep-ex_0104007 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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10.
(70)
A Precise Measurement of the Tau Lifetime / DELPHI Collaboration
The tau lepton lifetime has been measured with the e+e- -> tau+tau- events collected by the DELPHI detector at LEP in the years 1991-1995. Three different methods have been exploited, using both one-prong and three-prong tau decay channels. [...]
hep-ex/0410010; CERN-EP-2003-070; CERN-EP-2003-070.- Geneva : CERN, 2004 - 27 p. - Published in : Eur. Phys. J. C 36 (2004) 283-296 Fulltext: ep-2003-070 - PDF; arXiv:hep-ex_0410010 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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