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CERN Document Server 115 εγγραφές βρέθηκαν  1 - 10επόμενοτέλος  μετάβαση στην εγγραφή: Η έρευνα πήρε 0.67 δευτερόλεπτα. 
1.
Measurement of the quark to photon fragmentation function through the inclusive production of prompt photons in hadronic $Z^0$ decays / OPAL Collaboration
The inclusive production of prompt photons with energy above 10 GeV is measured using the OPAL detector in hadronic Z^0 decays at LEP. In contrast to previous measurements, the prompt photons were not required to be isolated. [...]
hep-ex/9708020; CERN-PPE-97-086; CERN-PPE-97-86; CERN-PPE-97-086.- Geneva : CERN, 1998 - 24 p. - Published in : Eur. Phys. J. C 2 (1998) 39-48 Fulltext: PDF; External links: Fulltext; Fulltext
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2.
Multi-Photon Events with Large Missing Energy in $e^{+}e^{-}$ Collisions at $\sqrt{s}=192-209 GeV$ / OPAL Collaboration
Events with a final state consisting of two or more photons and large missing transverse energy have been observed in e+e- collisions at centre-of-mass energies in the range 192 - 209 GeV using the OPAL detector at LEP. Cross-section measurements are performed within the kinematic acceptance of the selection and compared with the expectation from the Standard Model process e+e- -> nu nu gamma gamma(gamma). [...]
hep-ex/0412011; CERN-PH-EP-2004-035.- Geneva : CERN, 2004-10-12 - 13 p. - Published in : Phys. Lett. B 602 (2004) 167-179 Fulltext: 0412011 - PDF; arXiv:hep-ex_0412011 - PDF; S037026930401370X - XML; External link: hep-ex/0412011 PDF - Please contact the library if you need to access this document.
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3.
Measurement of the Charm structure Function $F_{2}^{\gamma},c$ of the Photon at LEP / OPAL Collaboration
The production of charm quarks is studied in deep-inelastic electron-photon scattering using data recorded by the OPAL detector at LEP at normal e+e- centre-of-mass energies from 183 to 209 GeV. The charm quarks have been identified by full reconstruction of charged D* mesons using their decays into D0pi with the D0 observed in two decay modes with charged particle final states, Kpi and K3pi. [...]
hep-ex/0206021; CERN-EP-2002-031; CERN-EP-2002-031.- Geneva : CERN, 2002 - 19 p. - Published in : Phys. Lett. B 539 (2002) 13-24 Fulltext: arXiv:hep-ex_0206021 - PDF; ep-2002-031 - PDF; ep-2002-031_pr354 - PS.GZ; External link: Preprint - Please contact the library if you need to access this document.
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4.
Measurement of $Z/\gamma^{*}$ production in Compton scattering of quasi-real photons / OPAL Collaboration
The process e+ e- -> e+ e- Z/gamma* is studied with the OPAL detector at LEP at a centre of mass energy of sqrt(s) = 189 GeV. The cross-section times the branching ratio of the Z/gamma* decaying into hadrons is measured within Lorentz invariant kinematic limits to be (1.2 +/- 0.3 +/- 0.1) pb for invariant masses of the hadronic system between 5 GeV and 60 GeV and (0.7 +/- 0.2 +/- 0.1) pb for hadronic masses above 60 GeV. [...]
hep-ex/0107047; CERN-EP-2001-053; CERN-EP-2001-053.- Geneva : CERN, 2002 - 35 p. - Published in : Eur. Phys. J. C 24 (2002) 1-15 Fulltext: arXiv:hep-ex_0107047 - PDF; 0107047 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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5.
Determination of the b Quark Mass at the Z Mass Scale / OPAL Collaboration
In hadronic decays of Z bosons recorded with the OPAL detector at LEP, events containing b quarks were selected using the long lifetime of b flavoured hadrons. Comparing the 3-jet rate in b events with that in d u,s and c quark events, a significant difference was observed. [...]
hep-ex/0105046; CERN-EP-2001-034; CERN-EP-2001-034.- Geneva : CERN, 2001 - 27 p. - Published in : Eur. Phys. J. C 21 (2001) 411-422 Fulltext: 0105046 - PDF; arXiv:hep-ex_0105046 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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6.
Angular Analysis of the Muon Pair Asymmetry at LEP 1 / OPAL Collaboration
Data on muon pair production obtained by the OPAL collaboration at centre of mass energies near the Z peak are analysed. Small angular mismatches between the directions of the two muons are used to assess the effects of initial state photon radiation and initial-final-state radiation interference on the forward-backward asymmetry of muon pairs. [...]
hep-ex/0107046; CERN-EP-2001-052; CERN-EP-2001-052.- Geneva : CERN, 2001 - 31 p. - Published in : Phys. Lett. B 516 (2001) 1-20 Fulltext: arXiv:hep-ex_0107046 - PDF; 0107046 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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7.
Precision Neutral Current Asymmetry Parameter Measurements from the Tau Polarization at LEP / OPAL Collaboration
Measurements of the tau lepton polarization and forward-backward polarization asymmetry near the Z resonance using the OPAL detector are described. The measurements are based on analyses of tau -> e nu_e nu_tau, tau -> mu nu_mu nu_tau, tau -> pi nu_tau, tau -> rho nu_tau and tau -> a1 nu_tau decays from a sample of 144810 e+e- -> tau+ tau- candidates corresponding to an integrated luminosity of 151 pb-1. [...]
hep-ex/0103045; CERN-EP-2001-023; CERN-EP-2001-023.- Geneva : CERN, 2001 - 36 p. - Published in : Eur. Phys. J. C 21 (2001) 1-21 Fulltext: 0103045 - PDF; arXiv:hep-ex_0103045 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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8.
Measurement of the Branching Ratio for $D_{s} \to \tau\nu_{\tau}$ Decays / OPAL Collaboration
Using about 3.9 million hadronic Z decays from e+e- collisions recorded by the OPAL detector at LEP at centre-of-mass energies near MZ the branching ratio for the decay D_s -> tau nu_tau has been measured to be (7.0 +/- 2.1(stat) +/- 2.0 (syst))%. This result can be used to derive the decay constant of the D_s meson: f(D_s) = 286 +/- 44(stat) +/- 41(syst) MeV..
hep-ex/0103012; CERN-EP-2001-019; CERN-EP-2001-019.- Geneva : CERN, 2001 - 23 p. - Published in : Phys. Lett. B 516 (2001) 236-248 Fulltext: 0103012 - PDF; arXiv:hep-ex_0103012 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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9.
A Search for a Narrow Radial Excitation of the $D^{*\pm}$ Meson / OPAL Collaboration
A sample of 3.73 million hadronic Z decays, recorded with the OPAL detector at LEP in the years 1991-95, has been used to search for a narrow resonance corresponding to the decay of the D*'+/-(2629) meson into D*+/- pi+ pi-. The D*+ mesons are reconstructed in the decay channel D*+ -> D0 pi+ with D0 -> K- pi+ [...]
hep-ex/0101045; CERN-EP-2001-003; CERN-EP-2001-003.- Geneva : CERN, 2001 - 21 p. - Published in : Eur. Phys. J. C 20 (2001) 445-454 Fulltext: arXiv:hep-ex_0101045 - PDF; 0101045 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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10.
A Simultaneous Measurement of the QCD Colour Factors and the Strong Coupling / OPAL Collaboration
Using data from e+e- annihilation into hadrons, taken with the OPAL detector at LEP at the Z pole between 1991 and 1995, we performed a simultaneous measurement of the colour factors of the underlying gauge group of the strong interaction, CF and CA, and the strong coupling, alpha(s). The measurement was carried out by fitting next-to-leading order perturbative predictions to measured angular correlations of 4-jet events together with multi-jet related variables. [...]
hep-ex/0101044; CERN-EP-2001-001; CERN-EP-2001-001.- Geneva : CERN, 2001 - 29 p. - Published in : Eur. Phys. J. C 20 (2001) 601-615 Fulltext: arXiv:hep-ex_0101044 - PDF; 0101044 - PDF; External links: Fulltext; Rivet analyses reference - Please contact the library if you need to access this document.
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CERN Document Server : 115 εγγραφές βρέθηκαν   1 - 10επόμενοτέλος  μετάβαση στην εγγραφή:
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