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CERN Document Server 2,044 εγγραφές βρέθηκαν  1 - 10επόμενοτέλος  μετάβαση στην εγγραφή: Η έρευνα πήρε 1.04 δευτερόλεπτα. 
1.
(100)
Inclusive Analysis of the b Quark Fragmentation Function in Z Decays at LEP / OPAL Collaboration
A study of b quark hadronisation is presented using inclusively reconstructed B hadrons in about four million hadronic Z decays recorded in 1992-2000 with the OPAL detector at LEP. The data are compared to different theoretical models, and fragmentation function parameters of these models are fitted [...]
hep-ex/0210031; CERN-EP-2002-051; CERN-EP-2002-051.- Geneva : CERN, 2003 - 27 p. - Published in : Eur. Phys. J. C 29 (2003) 463-478 Fulltext: arXiv:hep-ex_0210031 - PDF; ep-2002-051 - PDF; External links: Fulltext; Rivet analyses reference - Please contact the library if you need to access this document.
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2.
(85)
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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(85)
Transverse and Longitudinal Bose Einstein Correlations in hadronic $Z^0$ Decays / OPAL Collaboration
Bose-Einstein correlations in pairs of identical charged pions produced in asample of 4.3 million Z0 hadronic decays are studied as a function of the threecomponents of the momentum difference, transverse ("out" and "side") andlongitudinal with respect to the thrust direction of the event. A significantdifference between the transverse, r_t_side, and longitudinal, r_l, dimensionsis observed, indicating that the emitting source of identical pions, asobserved in the Longitudinally CoMoving System, has an elongated shape. [...]
hep-ex/0002062; CERN-EP-2000-004; CERN-EP-2000-004.- Geneva : CERN, 2000 - 19 p. - Published in : Eur. Phys. J. C 16 (2000) 423-433 Fulltext: 0002062 - PDF; arXiv:hep-ex_0002062 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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4.
(82)
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 Hadronic Cross-Section for the Scattering of Two Virtual Photons at LEP / OPAL Collaboration
The interaction of virtual photons is investigated using the reaction e+e- -> e+e- hadrons based on data taken by the OPAL experiment at e+e- centre-of-mass energies sqrt(s_ee)=189-209 GeV, for W>5 GeV and at an average Q^2 of 17.9 GeV^2. The measured cross-sections are compared to predictions of the Quark Parton Model (QPM), to the Leading Order QCD Monte Carlo model PHOJET to the NLO prediction for the reaction e+e- -> e+e-qqbar, and to BFKL calculations. [...]
hep-ex/0110006; CERN-EP-2001-064; CERN-EP-2001-064.- Geneva : CERN, 2001 - 30 p. - Published in : Eur. Phys. J. C 24 (2002) 17-31
- Published in : PoS: hep2001 (2001) , pp. 044 Fulltext: arXiv:hep-ex_0110006 - PDF; ep-2001-064 - PDF; Published version from PoS: hep2001-044 - PDF; hep2001-044_2 - PDF; External link: Preprint
In : International Europhysics Conference on High-Energy Physics, Budapest, Hungary, 12 - 18 Jul 2001, pp.044 - Please contact the library if you need to access this document.
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(81)
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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7.
(81)
Genuine Correlations of Like-Sign Particles in Hadronic $Z^0$ Decays / OPAL Collaboration
Correlations among hadrons with the same electric charge produced in Z0 decays are studied using the high statistics data collected from 1991 through 1995 with the OPAL detector at LEP. Normalized factorial cumulants up to fourth order are used to measure genuine particle correlations as a function of the size of phase space domains in rapidity, azimuthal angle and transverse momentum. [...]
hep-ex/0110051; CERN-EP-2001-070; CERN-EP-2001-070.- Geneva : CERN, 2001 - 26 p. - Published in : Phys. Lett. B 523 (2001) 35-52 Fulltext: arXiv:hep-ex_0110051 - PDF; ep-2001-070 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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8.
(81)
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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9.
(81)
Search for Single Top Quark Production at LEP2 / OPAL Collaboration
A search for single top quark production via flavour changing neutral currents (FCNC) was performed with data collected by the OPAL detector at the e+e- collider LEP. Approximately 600 pb-1 of data collected at sqrt(s) = 189 - 209 GeV were used to search for the FCNC process e+ e- -> tc(u) -> bWc(u). [...]
hep-ex/0110009; CERN-EP-2001-066; CERN-EP-2001-066.- Geneva : CERN, 2001 - 22 p. - Published in : Phys. Lett. B 521 (2001) 181-194 Fulltext: S0370269301011959 - XML; arXiv:hep-ex_0110009 - PDF; ep-2001-066 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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10.
(81)
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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