CERN Accelerating science

CERN Document Server 201 záznamov nájdených  1 - 10ďalšíkoniec  skoč na záznam: Hľadanie trvalo 0.89 sekúnd. 
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
2.
Inclusive Production of Charged Hadrons in Photon-Photon Collisions / OPAL Collaboration
The inclusive production of charged hadrons in the collisions of quasi-real photons e+e- -> e+e- +X has been measured using the OPAL detector at LEP. The data were taken at e+e- centre-of-mass energies from 183 to 209 GeV. [...]
hep-ex/0612045; CERN-PH-EP-2006-038; CERN-PH-EP-2006-038.- Geneva : CERN, 2007 - 21 p. - Published in : Phys. Lett. B 651 (2007) 92-101 Fulltext: arXiv:hep-ex_0612045 - PDF; 0612045 - PDF; phep-2006-038 - PDF; External link: Preprint
3.
QCD coherence and correlations of particles with restricted momenta in hadronic Z decays / OPAL Collaboration
QCD coherence effects are studied based on measurements of correlations of particles with either restricted transverse momenta, pT<pTcut, where pT is defined with respect to the thrust axis, or restricted absolute momenta, p equiv |p| < pcut, using about four million hadronic Z decays recorded at LEP with the OPAL detector. The correlations are analyzed in terms of normalized factorial and cumulant moments. [...]
hep-ex/0604003; CERN-PH-EP-2006-003; CERN-PH-EP-2006-003.- Geneva : CERN, 2006 - 17 p. - Published in : Phys. Lett. B 638 (2006) 30-38 Fulltext: S0370269306005703 - XML; 0604003 - PDF; phep-2006-003 - PDF; arXiv:hep-ex_0604003 - PDF; External link: Preprint
4.
Measurement of the strong coupling $\alpha^{s}$ from four-jet observables in $e^{+}e^{-}$ annihilation / OPAL Collaboration
Data from e+e- annihilation into hadrons at centre-of-mass energies between 91 GeV and 209 GeV collected with the OPAL detector at LEP, are used to study the four-jet rate as a function of the Durham algorithm resolution parameter ycut. The four-jet rate is compared to next-to-leading order calculations that include the resummation of large logarithms. [...]
hep-ex/0601048; CERN-PH-EP-2005-057; CERN-PH-EP-2005-057.- Geneva : CERN, 2006 - 25 p. - Published in : Eur. Phys. J. C 47 (2006) 295-307 Fulltext: phep-2005-057 - PDF; 0601048 - PDF; arXiv:hep-ex_0601048 - PDF; External link: Preprint
5.
Colour reconnection in $e^{+}e^{-} \rightarrow W^{+}W^{-}$ at $\sqrt{s}=189-209 GeV$ / OPAL Collaboration
The effects of the final state interaction phenomenon known as colour reconnection are investigated at centre-of-mass energies in the range sqrt(s) ~ 189-209 GeV using the OPAL detector at LEP. Colour reconnection is expected to affect observables based on charged particles in hadronic decays of W+W-. [...]
hep-ex/0508062; CERN-PH-EP-2005-035; CERN-PH-EP-2005-035.- Geneva : CERN, 2006 - 30 p. - Published in : Eur. Phys. J. C 45 (2006) 291-305 Fulltext: 0508062 - PDF; arXiv:hep-ex_0508062 - PDF; phep-2005-035 - PDF; External link: Preprint
6.
Measurement of the mass and width of the W boson / OPAL Collaboration
The mass and width of the W boson are measured using e+e- -> W+W- events from the data sample collected by the OPAL experiment at LEP at centre-of-mass energies between 170 GeV and 209 GeV. The mass (mw) and width (gw) are determined using direct reconstruction of the kinematics of W+W- -> qqbarlv and W+W- -> qqbarqqbar events [...]
hep-ex/0508060; OPAL-PR-410; CERN-PH-EP-2005-038; CERN-PH-EP-2005-038.- Geneva : CERN, 2006 - 49 p. - Published in : Eur. Phys. J. C 45 (2006) 307-335 Fulltext: phep-2005-038 - PDF; 0508060 - PDF; arXiv:hep-ex_0508060 - PDF; External link: Preprint
7.
Searches for Gauge-Mediated Supersymmetry Breaking Topologies in $e^{+}e^{-}$ collisions at LEP2 / OPAL Collaboration
Searches were performed for topologies predicted by gauge-mediated Supersymmetry breaking models (GMSB). All possible lifetimes of the next-to-lightest SUSY particle (NLSP), either the lightest neutralino or slepton, decaying into the lightest SUSY particle, the gravitino, were considered. [...]
hep-ex/0507048; CERN-PH-EP-2005-025; CERN-PH-EP-2005-025.- Geneva : CERN, 2006 - 61 p. - Published in : Eur. Phys. J. C 46 (2006) 307-341 Fulltext: arXiv:hep-ex_0507048 - PDF; phep-2005-025 - PDF; 0507048 - PDF; External link: Preprint
8.
Determination of $\alpha_{s}$ using Jet Rates at LEP with the OPAL detector / OPAL Collaboration
Hadronic events produced in e+e- collisions by the LEP collider and recorded by the OPAL detector were used to form distributions based on the number of reconstructed jets. The data were collected between 1995 and 2000 and correspond to energies of 91 GeV, 130-136 GeV and 161-209 GeV. [...]
hep-ex/0507047; CERN-PH-EP-2005-024; CERN-PH-EP-2005-024.- Geneva : CERN, 2006 - 40 p. - Published in : Eur. Phys. J. C 45 (2006) 547-568 Fulltext: 0507047 - PDF; phep-2005-024 - PDF; arXiv:hep-ex_0507047 - PDF; External link: Preprint
9.
Measurement of the running of the QED coupling in small-angle Bhabha scattering at LEP / OPAL Collaboration
Using the OPAL detector at LEP, the running of the effective QED coupling alpha(t) is measured for space-like momentum transfer from the angular distribution of small-angle Bhabha scattering. In an almost ideal QED framework, with very favourable experimental conditions, we obtain: Delta alpha(-6.07GeV^2) - Delta alpha(-1.81GeV^2) = (440 pm 58 pm 43 pm 30) X 10^-5, where the first error is statistical, the second is the experimental systematic and the third is the theoretical uncertainty. [...]
hep-ex/0505072; CERN-PH-EP-2005-014; CERN-PH-EP-2005-014.- Geneva : CERN, 2006 - 44 p. - Published in : Eur. Phys. J. C 45 (2006) 1-21 Fulltext: arXiv:hep-ex_0505072 - PDF; phep-2005-014 - PDF; External link: Preprint - Please contact the library if you need to access this document.
10.
Study of Z Pair Production and Anomalous Couplings in $e^+ e^-$ Collisions at $\sqrt{s}$ between 190 GeV and 209 GeV / OPAL Collaboration
A study of Z-boson pair production in e+e- annihilation at center-of-mass energies between 190 GeV and 209 GeV is reported. Final states containing only leptons, (l+l-l+l- and l+l-nn), quark and lepton pairs, (qql+l-, qqnn) and only hadrons (qqqq) are considered. [...]
hep-ex/0310013; CERN-EP-2003-049; CERN-EP-2003-049.- Geneva : CERN, 2003 - 35 p. - Published in : Eur. Phys. J. C 32 (2003) 303-322 Fulltext: ep-2003-049 - PDF; arXiv:hep-ex_0310013 - PDF; 0310013 - PDF; External link: Preprint - Please contact the library if you need to access this document.

CERN Document Server : 201 záznamov nájdených   1 - 10ďalšíkoniec  skoč na záznam:
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