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CERN Document Server Znaleziono 65 rekordów  1 - 10następnykoniec  skocz do rekordu: Szukanie trwało 0.60 sekund. 
1.
Precision Luminosity for Z0 Lineshape Measurements with a Silicon-Tungsten Calorimeter / OPAL Collaboration
The measurement of small-angle Bhabha scattering is used to determine the luminosity at the OPAL interaction point for the LEP I data recorded between 1993 and 1995. The measurement is based on the OPAL Silicon-Tungsten Luminometer which is composed of two calorimeters encircling the LEP beam pipe, on opposite sides of the interaction point. [...]
hep-ex/9910066; CERN-EP-99-136; CERN-EP-99-136.- Geneva : CERN, 2000 - 89 p. - Published in : Eur. Phys. J. C 14 (2000) 373-425 Fulltext: 9910066 - PDF; arXiv:hep-ex_9910066 - PDF; External link: hep-ex/9910066 PDF - Please contact the library if you need to access this document.
2.
Search for Anomalous Production of Acoplanar Di-lepton Events in e+e Collisions at s=183 and 189 GeV / OPAL Collaboration
A selection of di-lepton events with significant missing transverse momentum has been performed using a total data sample of 237.4 pb-1 at e+e- centre-of-mass energies of 183 GeV and 189 GeV. The observed numbers of events - 78 at 183 GeV and 301 at 189 GeV - are consistent with the numbers expected from Standard Model processes, which arise predominantly from W+W- production with each W decaying leptonically. [...]
hep-ex/9909052; CERN-EP-99-122; CERN-EP-99-122.- Geneva : CERN, 2000 - 42 p. - Published in : Eur. Phys. J. C 14 (2000) 51-71 Fulltext: arXiv:hep-ex_9909052 - PDF; 9909052 - PDF; External link: hep-ex/9909052 PDF - Please contact the library if you need to access this document.
3.
Search for Chargino and Neutralino Production at s=189GeV at LEP / OPAL Collaboration
A search for charginos and neutralinos, predicted by supersymmetric theories, is performed using a data sample of 182.1 pb-1 taken at a centre-of-mass energy of 189 GeV with the OPAL detector at LEP. No evidence for chargino or neutralino production is found. [...]
hep-ex/9909051; CERN-EP-99-123; CERN-EP-99-123.- Geneva : CERN, 2000 - 22 p. - Published in : Eur. Phys. J. C 14 (2000) 187-198 Fulltext: 9909051 - PDF; arXiv:hep-ex_9909051 - PDF; External link: hep-ex/9909051 PDF - Please contact the library if you need to access this document.
4.
A Study of Three-Prong τ Decays with Charged Kaons / OPAL Collaboration
From an analysis of the ionisation energy loss of charged particles selected from a sample of 147926 e+e- -> tau+tau- candidates recorded in the OPAL detector at e+e- centre-of-mass energies near the Z0 resonance, we determine the branching ratios: BR(tau- -> nu_tau K- pi- pi+ (pi0)) = 0.343 +- 0.073 +- 0.031 % BR(tau- -> nu_tau K- pi- K+ (pi0)) = 0.159 +- 0.053 +- 0.020 % where the (pi0) notation refers to decay modes with or without an accompanying pizero. The tau- -> nu_tau K- pi- pi+ (pi0) final states occurring through tau- -> nu_tau K- K_s (pi0) are treated as background in this analysis. [...]
hep-ex/9908013; CERN-EP-99-095; CERN-EP-99-095.- Geneva : CERN, 2000 - 38 p. - Published in : Eur. Phys. J. C 13 (2000) 197-212 Fulltext: arXiv:hep-ex_9908013 - PDF; 9908013 - PDF; External link: Preprint - Please contact the library if you need to access this document.
5.
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.
6.
Search for pair-produced leptoquarks in e+e interactions at s 183 GeV / OPAL Collaboration
A search for pair-produced leptoquarks has been performed using a sample of e+e- collision events collected by the OPAL detector at LEP at e+e- centre-of-mass energies of about 183 GeV. The data sample corresponds to an integrated luminosity of 55.9 pb-1. [...]
hep-ex/9908007; CERN-EP-99-091; CERN-EP-99-091.- Geneva : CERN, 2000 - 27 p. - Published in : Eur. Phys. J. C 13 (2000) 15-27 Fulltext: 9908007 - PDF; arXiv:hep-ex_9908007 - PDF; External link: Preprint - Please contact the library if you need to access this document.
7.
Search for Neutral Higgs Bosons in e+e Collisions at s 189 GeV / OPAL Collaboration
A search for neutral Higgs bosons has been performed with the OPAL detector at LEP, using approximately 170 pb-1 of e+e- collision data collected at sqrt(s)~189GeV. Searches have been performed for the Standard Model (SM) process e+e- to H0Z0 and the MSSM processes e+e- to H0Z0, A0h0. [...]
hep-ex/9908002; CERN-EP-99-096; CERN-EP-99-096.- Geneva : CERN, 2000 - 39 p. - Published in : Eur. Phys. J. C 12 (2000) 567-86 Fulltext: arXiv:hep-ex_9908002 - PDF; 9908002 - PDF; External link: hep-ex/9908002 PDF - Please contact the library if you need to access this document.
8.
Measurement of the Production Rate of Charm Quark Pairs from Gluons in Hadronic Z0 Decays / OPAL Collaboration
The rate of secondary charm-quark-pair production has been measured in 4.4 million hadronic Z0 decays collected by OPAL. By selecting events with three jets and tagging charmed hadrons in the gluon jet candidate using leptons and charged D* mesons, the average number of secondary charm-quark pairs per hadronic event is found to be (3.20+-0.21+-0.38)x10-2..
hep-ex/9908001; CERN-EP-99-089; CERN-EP-99-089.- Geneva : CERN, 2000 - 23 p. - Published in : Eur. Phys. J. C 13 (2000) 1-13 Fulltext: 9908001 - PDF; arXiv:hep-ex_9908001 - PDF; External link: hep-ex/9908001 PDF - Please contact the library if you need to access this document.
9.
Multi-photon production in e+e collisions at s = 189 GeV / OPAL Collaboration
The process e+e- to 2 (or 3) gammas is studied using data recorded with the OPAL detector at LEP. The data sample taken at a centre-of-mass energy of 189 GeV corresponds to a total integrated luminosity of 178 pb-1. [...]
hep-ex/9907064; CERN-EP-99-088; CERN-EP-99-088.- Geneva : CERN, 1999 - 23 p. - Published in : Phys. Lett. B 465 (1999) 303-314 Fulltext: 9907064 - PDF; arXiv:hep-ex_9907064 - PDF; External link: Preprint - Please contact the library if you need to access this document.
10.
A study of Bs0 meson oscillation using hadronic Z0 decays containing leptons / OPAL Collaboration
A sample of Z decays containing b-flavoured hadrons is tagged using leptons, and events having precise proper time measurements are selected. These events are used to study Bs oscillations. [...]
hep-ex/9907061; CERN-EP-99-085; CERN-EP-99-085.- Geneva : CERN, 1999 - 28 p. - Published in : Eur. Phys. J. C 11 (1999) 587-598 Fulltext: arXiv:hep-ex_9907061 - PDF; 9907061 - PDF; External link: Preprint - Please contact the library if you need to access this document.

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