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CERN Document Server 2,046 εγγραφές βρέθηκαν  1 - 10επόμενοτέλος  μετάβαση στην εγγραφή: Η έρευνα πήρε 1.23 δευτερόλεπτα. 
1.
(100)
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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2.
(91)
Bose-Einstein correlations of three charged pions in hadronic $Z^{0}$ decays / OPAL Collaboration
Bose-Einstein Correlations (BEC) of three identical charged pions were studied in 4 x 10^6 hadronic Z^0 decays recorded with the OPAL detector at LEP. The genuine three-pion correlations, corrected for the Coulomb effect, were separated from the known two-pion correlations by a new subtraction procedure. [...]
hep-ex/9806036; CERN-EP-98-068; CERN-EP-98-68; CERN-EP-98-068.- Geneva : CERN, 1998 - 19 p. - Published in : Eur. Phys. J. C 5 (1998) 239-248 Fulltext: arXiv:hep-ex_9806036 - PDF; 9806036 - PDF; External link: hep-ex/9806036 PDF - Please contact the library if you need to access this document.
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3.
(86)
Measurement of event shape distributions and moments in $e^{+}e^{-} \to$ hadrons at 91-209 GeV and a determination of $\alpha_{s}$ / OPAL Collaboration
We have studied hadronic events from e+e- annihilation data at centre-of-mass energies from 91 to 209 GeV. We present distributions of event shape observables and their moments at each energy and compare with QCD Monte Carlo models. [...]
hep-ex/0503051; CERN-PH-EP-2004-044; CERN-PH-EP-2004-044.- Geneva : CERN, 2005 - 63 p. - Published in : Eur. Phys. J. C 40 (2005) 287-316 Fulltext: phep-2004-044 - PDF; arXiv:hep-ex_0503051 - PDF; 0503051 - PDF; External links: Fulltext; Rivet analyses reference - Please contact the library if you need to access this document.
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4.
(86)
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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5.
(85)
Measurements of the $b\overline{b}$ production cross section and forward- backward asymmetry at centre-of-mass energies above the Z pole at LEP / L3 Collaboration
The measurements of $R_{b} = \sigma(e^+e^-} \to b\overline{b})/\sigma( e^+e^-} \to{m q\overline{q})$ and of the b quarkforward--backward charge asymmetry,$A_fb}^{b}$, at centre--of--mass energies above the Z pole are described. The measurement of $R_{b}$ is performed at $\sqrt{s}$ between 130 and 189 GeV using a b--tagging method thatexploits the relatively large decay length ofb--hadrons [...]
hep-ex/0005023; CERN-EP-2000-054; CERN-EP-2000-054; CERN-L3-207.- Geneva : CERN, 2000 - 22 p. - Published in : Phys. Lett. B 485 (2000) 71-84 Fulltext: arXiv:hep-ex_0005023 - PDF; ep-2000-054 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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6.
(85)
Midrapidity antiproton-to-proton ratio in pp collisions at $\sqrt{s} = 0.9$ and $7$~TeV measured by the ALICE experiment / ALICE collaboration
The ratio of the yields of antiprotons to protons in pp collisions has been measured by the ALICE experiment at $\sqrt{s} = 0.9$ and $7$~TeV during the initial running periods of the Large Hadron Collider(LHC). The measurement covers the transverse momentum interval $0.45 < p_{\rm{t}} < 1.05$~GeV/$c$ and rapidity $|y| < 0.5$. [...]
arXiv:1006.5432.- 2010 - 12 p. - Published in : Phys. Rev. Lett. 105 (2010) 072002 APS Open Access article: PDF; Fulltext: PDF; External link: DURHAM
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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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8.
(79)
The $\eta_c$(2980) formation in two-photon collisions at LEP energies / DELPHI Collaboration
eta_c(2980) production in gamma-gamma interactions has been detected via its decays into K0_s K+/- pi-/+, K+ K- K+ K- and K+ K- pi+ pi- in the data taken with the DELPHI detector at LEP1 and LEP2 energies. The two-photon radiative width averaged over all observed decay channels is \Gamma_{\gamma\gamma} = 13.9 +/- 2.0 (stat.) +/- 1.4 (syst.) +/- 2.7 (BR) keV. [...]
hep-ex/0311002; CERN-EP-2003-035; CERN-EP-2003-035.- Geneva : CERN, 2003 - 12 p. - Published in : Eur. Phys. J. C 31 (2003) 481-489 Fulltext: arXiv:hep-ex_0311002 - PDF; ep-2003-035 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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9.
(78)
Production of $\Xi_{c}^{0}$ and $\Xi_{b}$ in Z decays and lifetime measurement of $\Xi_{b}$ / DELPHI Collaboration
The charmed strange baryon Xi_c^0 was searched for in the decay channel Xi_c^0 -> Xi- pi+, and the beauty strange baryon Xi_b in the inclusive channel Xi_b -> Xi- l- anti-nu X, using the 3.5 million hadronic Z events collected by the DELPHI experiment in the years 1992--1995. The Xi- was reconstructed through the decay Xi- -> Lambda pi-, using a constrained fit method for cascade decays. [...]
hep-ex/0510023; CERN-PH-EP-2004-068; CERN-PH-EP-2004-068.- Geneva : CERN, 2005 - 21 p. - Published in : Eur. Phys. J. C 44 (2005) 299-309 Fulltext: 0510023 - PDF; arXiv:hep-ex_0510023 - PDF; External link: Preprint
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(78)
Measurement of the semileptonic b branching fractions and average b mixing parameter in Z decays / DELPHI Collaboration
The semileptonic branching fractions for primary and cascade b decays BR(b -> lepton-), BR(b -> c -> lepton+) and BR(b -> cbar -> lepton-) were measured in hadronic Z decays collected by the DELPHI experiment at LEP. The sample was enriched in b decays using the lifetime information and various techniques were used to separate leptons from direct or cascade b decays [...]
hep-ex/0105080; CERN-EP-2000-157; CERN-EP-2000-157.- Geneva : CERN, 2001 - 40 p. - Published in : Eur. Phys. J. C 20 (2001) 455-478 Fulltext: arXiv:hep-ex_0105080 - PDF; ep-2000-157 - PDF; External link: Preprint
In : 30th International Conference on High-energy Physics, Osaka, Japan, 27 Jul - 2 Aug 2000, pp.e-page 408 - Please contact the library if you need to access this document.
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