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CERN Document Server Encontrados 2,045 registros  1 - 10siguientefinal  ir al registro: La búsqueda tardó 1.05 segundos. 
1.
(100)
Charged Multiplicities in Z Decays into u, d, and s Quarks / OPAL Collaboration
About 4.4 million hadronic decays of Z bosons, recorded by the OPAL detector at LEP at a centre-of-mass energy of around sqrt(s) = 91.2 GeV, are used to determine the mean charged particle multiplicities for the three light quark flavours. Events from primary u, d, and s quarks are tagged by selecting characteristic particles which carry a large fraction of the beam energy. [...]
hep-ex/0011022; CERN-EP-2000-128; CERN-EP-2000-128.- Geneva : CERN, 2001 - 24 p. - Published in : Eur. Phys. J. C 19 (2001) 257-268 Fulltext: arXiv:hep-ex_0011022 - PDF; 0011022 - PDF; External links: Fulltext; Rivet analyses reference - Please contact the library if you need to access this document.
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2.
(91)
Identified Charged Particles in Quark and Gluon Jets / DELPHI Collaboration
A sample of 2.2 million hadronic \z decays, selected fythe {\sc Delphi} detector at {\sc Lep} during 1994-199nimprovedmeasurement of inclusive distributions of \pie, \kp anrantiparticles in gluon and quark jets. The production l identified particles were found to be softer in gluon kjets, with a higher multiplicity in gluon jets as obseecharged particles. [...]
hep-ex/0106063; CERN-EP-2000-007; CERN-EP-2000-007.- Geneva : CERN, 2000 - 26 p. - Published in : Eur. Phys. J. C 17 (2000) 207-222 Fulltext: ep-2000-007_version1 - PDF; ep-2000-007_version3 - PDF; ep-2000-007_version2 - PDF; arXiv:hep-ex_0106063 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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3.
(85)
Leading Particle Production in Light Flavour Jets / OPAL Collaboration
The energy distribution and type of the particle with the highest momentum in quark jets are determined for each of the five quark flavours making only minimal model assumptions. The analysis is based on a large statistics sample of hadronic Z0 decays collected with the OPAL detector at the LEP e+e- collider. [...]
hep-ex/0001054; CERN-EP-99-164; CERN-EP-99-164.- Geneva : CERN, 2000 - 34 p. - Published in : Eur. Phys. J. C 16 (2000) 407-421 Fulltext: arXiv:hep-ex_0001054 - PDF; 0001054 - PDF; External link: hep-ex/0001054 PDF - Please contact the library if you need to access this document.
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4.
(84)
Test of the Flavour Independence of $\alpha_{s}$ using Next-to-Leading Order Calculations for Heavy Quarks / OPAL Collaboration
We present a test of the flavour independence of the strong coupling constant for charm and bottom quarks with respect to light (uds) quarks, based on a hadronic event sample obtained with the OPAL detector at LEP. Five observables related to global event shapes were used to measure alpha_s in three flavour tagged samples (uds, c and b). [...]
hep-ex/9904013; CERN-EP-99-045; CERN-EP-99-045.- Geneva : CERN, 1999 - 32 p. - Published in : Nucl. Phys. B, Proc. Suppl. 74 (1999) 16-19 Fulltext: 9904013 - PDF; arXiv:hep-ex_9904013 - PDF; External link: DURHAM - Please contact the library if you need to access this document.
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5.
(84)
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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6.
(83)
Measurements of inclusive semileptonic branching fractions of b hadrons in $Z^{0}$ decays / OPAL Collaboration
A measurement of inclusive semileptonic branching fractions of b hadrons produced in Z decays is presented. An enriched Z -> bbbar sample is obtained with a lifetime flavour-tagging technique. [...]
hep-ex/9906041; CERN-EP-99-078; CERN-EP-99-78; CERN-EP-99-078.- Geneva : CERN, 2000 - 32 p. - Published in : Eur. Phys. J. C 13 (2000) 225-240 Fulltext: 9906041 - PDF; arXiv:hep-ex_9906041 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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7.
(81)
Measurement of the $B^0$ Lifetime and Oscillation Frequency using $\overline{B}^{0} \to D^{*+}l^{-}\overline{\nu}$ decays / OPAL Collaboration
The lifetime and oscillation frequency of the B0 meson has been measured using B0->D*+l-v decays recorded on the Z0 peak with the OPAL detector at LEP. The D*+ -> D0pi+ decays were reconstructed using an inclusive technique and the production flavour of the B0 mesons was determined using a combination of tags from the rest of the event. [...]
hep-ex/0010013; CERN-EP-2000-090; CERN-EP-2000-90; CERN-EP-2000-090.- Geneva : CERN, 2000 - 18 p. - Published in : Phys. Lett. B 493 (2000) 266 Fulltext: 0010013 - PDF; arXiv:hep-ex_0010013 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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8.
(81)
Two Higgs Doublet Model and Model Independent Interpretation of Neutral Higgs Boson Searches / OPAL Collaboration
Searches for the neutral Higgs bosons h0 and A0, are used to obtain limits on the Type II Two Higgs Doublet Model (2HDM(II)) with no CP-violation in the Higgs sector and no additional particles besides the five Higgs bosons. The analysis combines approximately 170 pb-1 of data collected with the OPAL detector at sqrt{s} ~ 189 GeV with previous runs at sqrt{s} ~ mZ and sqrt{s} ~ 183 GeV. [...]
hep-ex/0007040; CERN-EP-2000-092; CERN-EP-2000-092.- Geneva : CERN, 2001 - 37 p. - Published in : Eur. Phys. J. C 18 (2001) 425-445 Fulltext: 0007040 - PDF; arXiv:hep-ex_0007040 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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9.
(81)
Production rate of $b\overline{b}$ quark pairs from gluons and $b\overline{b}b\overline{b}$ events in hadronic Z decays / OPAL Collaboration
The rates are measured per hadronic Z decay for gluon splitting to bb(bar) quark pairs, g_bb, and of events containing two bb(bar) quark pairs, g_4b, using a sample of four-jet events selected from data collected with the OPAL detector. Events with an enhanced signal of gluon splitting to bb(bar) quarks are selected if two of the jets are close in phase-space and contain detached secondary vertices [...]
hep-ex/0010029; CERN-EP-2000-123; CERN-EP-2000-123.- Geneva : CERN, 2001 - 23 p. - Published in : Eur. Phys. J. C 18 (2001) 447-460 Fulltext: arXiv:hep-ex_0010029 - PDF; 0010029 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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10.
(79)
A Measurement of the Rate of Charm Production in W Decays / OPAL Collaboration
Using data recorded at centre-of-mass energies around 183 GeV and 189 GeV with the OPAL detector at LEP, the fundamental coupling of the charm quark to the W boson has been studied. The ratio Rc^W = Gamma(W -> cX)/Gamma(W -> hadrons) has been measured from jet properties, lifetime information, and leptons produced in charm decays. [...]
hep-ex/0009020; CERN-EP-2000-100; CERN-EP-2000-100.- Geneva : CERN, 2000 - 19 p. - Published in : Phys. Lett. B 490 (2000) 71-86 Fulltext: 0009020 - PDF; arXiv:hep-ex_0009020 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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