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CERN Document Server 2,050 εγγραφές βρέθηκαν  1 - 10επόμενοτέλος  μετάβαση στην εγγραφή: Η έρευνα πήρε 1.22 δευτερόλεπτα. 
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Total Hadronic Cross-Section of Photon-Photon Interactions at LEP / OPAL Collaboration
The total hadronic cross-section sigma_gg(W) for the interaction of real photons, gg->hadrons, is measured for gg centre-of-mass energies 10<W<110 GeV. The cross-section is extracted from a measurement of the process e+e- -> e+e-g*g* -> e+e- hardrons, using a luminosity function for the photon flux together with form factors for extrapolating to real photons (Q^2=0 GeV^2). [...]
hep-ex/9906039; CERN-EP-99-076; CERN-EP-99-076.- Geneva : CERN, 2000 - 29 p. - Published in : Eur. Phys. J. C 14 (2000) 199-212 Fulltext: 9906039 - PDF; arXiv:hep-ex_9906039 - PDF; External link: DURHAM - Please contact the library if you need to access this document.
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2.
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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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3.
(86)
Inclusive production of charged hadrons and $K_{s}^{0}$ mesons in photon-photon collisions / OPAL Collaboration
The production of charged hadrons and K_s mesons in the collisions of quasi-real photons has been measured using the OPAL detector at LEP. The data were taken at e+e- centre-of-mass energies of 161 and 172 GeV. [...]
hep-ex/9808009; CERN-EP-98-091; CERN-EP-98-91; CERN-EP-98-091.- Geneva : CERN, 1999 - 24 p. - Published in : Eur. Phys. J. C 6 (1999) 253-264 Fulltext: arXiv:hep-ex_9808009 - PDF; 9808009 - PDF; External link: DURHAM - Please contact the library if you need to access this document.
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4.
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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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5.
(79)
Measurement of Isolated Prompt Photon Production in Photon-Photon Collisions at $\sqrt{s_{ee}}$=183-209 GeV / OPAL Collaboration
For the first time at LEP the production of prompt photons is studied in the collisions of quasi-real photons using the OPAL data taken at e+e- centre-of-mass energies between 183 GeV and 209 GeV. The total inclusive production cross-section for isolated prompt photons in the kinematic range of photon transverse momentum larger than 3.0 GeV and absolute photon pseudorapidity less than 1 is determined to be 0.32 +- 0.04 (stat) +- 0.04 (sys) pb. [...]
hep-ex/0305075; CERN-EP-2003-023; CERN-EP-2003-023.- Geneva : CERN, 2004 - 28 p. - Published in : Nucl. Phys. B, Proc. Suppl. 126 (2004) 140-5
- Published in : Eur. Phys. J. C 31 (2003) 491-502 Fulltext: arXiv:hep-ex_0305075 - PDF; ep-2003-023 - PDF; 0305075 - PDF; External link: Preprint
In : International Conference on the Structure and Interactions of the Photon, Frascati, Italy, 7 - 11 Apr 2003, pp.140-5 - Please contact the library if you need to access this document.
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6.
(79)
Tests of the Standard Model and constraints on new physics from measurements of fermion-pair production at 183 GeV at LEP / OPAL Collaboration
Cross-sections for hadronic, b-bbar and lepton pair final states in e+e- collisions at sqrt(s) = 183 GeV, measured with the OPAL detector at LEP, are presented and compared with the predictions of the Standard Model. Forward-backward asymmetries for the leptonic final states have also been measured. [...]
hep-ex/9808023; CERN-EP-98-108; CERN-EP-98-108.- Geneva : CERN, 1999 - 35 p. - Published in : Eur. Phys. J. C 6 (1999) 1-18 Fulltext: arXiv:hep-ex_9808023 - PDF; 9808023 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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7.
(77)
Search for Trilinear Neutral Gauge Boson Couplings in $Z\gamma$ production at $\sqrt{s}$=189 GeV at LEP / OPAL Collaboration
The data recorded at a centre-of-mass energy of 189GeV by the OPAL detector at LEP are used to search for trilinear couplings of the neutral gauge bosons in the process e+e- --> Z-gamma. The cross-sections are measured for multihadronic events with an energetic isolated photon and for events with a high energy photon accompanied by missing energy. [...]
hep-ex/0007016; CERN-EP-2000-067; CERN-EP-2000-067.- Geneva : CERN, 2000 - 26 p. - Published in : Eur. Phys. J. C 17 (2000) 553-566 Fulltext: 0007016 - PDF; arXiv:hep-ex_0007016 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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8.
(76)
Tests of the Standard Model and Constraints on New Physics from Measurements of Fermion-pair Production at 189 GeV at LEP / OPAL Collaboration
Cross-sections and angular distributions for hadronic and lepton pair final states in e+e- collisions at a centre-of-mass energy near 189 GeV, measured with the OPAL detector at LEP, are presented and compared with the predictions of the Standard Model. The results are used to measure the energy dependence of the electromagnetic coupling constant alpha_em, and to place limits on new physics as described by four-fermion contact interactions or by the exchange of a new heavy particle such as a sneutrino in supersymmetric theories with R-parity violation. [...]
hep-ex/9908008; CERN-EP-99-097; CERN-EP-99-097.- Geneva : CERN, 2000 - 43 p. - Published in : Eur. Phys. J. C Fulltext: arXiv:hep-ex_9908008 - PDF; 9908008 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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9.
(76)
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
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10.
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Measurement of the longitudinal cross-section using the direction of the thrust axis in hadronic events at LEP / OPAL Collaboration
In the process e+e- to hadrons, one of the effects of gluon emission is to modify the 1+cos(theta)**2 form of the angular distribution of the thrust axis, an effect which may be quantified by the longitudinal cross-section. Using the OPAL detector at LEP, we have determined the longitudinal to total cross-section ratio to be 0.0127+-0.0016+-0.0013 at the parton level, in good agreement with the expectation of QCD computed to Order(alpha_s**2) Comparisions at the hadron level with Monte Carlo models are presented. [...]
hep-ex/9808035; CERN-EP-98-124; CERN-EP-98-124.- Geneva : CERN, 1998 - 15 p. - Published in : Phys. Lett. B 440 (1998) 393-402 Fulltext: 9808035 - PDF; arXiv:hep-ex_9808035 - PDF; External link: DURHAM - Please contact the library if you need to access this document.
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