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CERN Document Server 2,044 záznamov nájdených  1 - 10ďalšíkoniec  skoč na záznam: Hľadanie trvalo 7.32 sekúnd. 
1.
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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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2.
(91)
Tests of the Standard Model and Constraints on New Physics from Measurements of Fermion-pair Production at 130-172 GeV at LEP / OPAL Collaboration
Production of events with hadronic and leptonic final states has been measured in e^+e^- collisions at centre-of-mass energies of 130-172 GeV, using the OPAL detector at LEP. Cross-sections and leptonic forward-backward asymmetries are presented, both including and excluding the dominant production of radiative Z \gamma events, and compared to Standard Model expectations. [...]
hep-ex/9708024; CERN-PPE-97-101; CERN-PPE-97-101.- Geneva : CERN, 1998 - 68 p. - Published in : Eur. Phys. J. C 2 (1998) 441-472 Fulltext: arXiv:hep-ex_9708024 - PDF; ppe-97-101 - PDF; External link: DURHAM - Please contact the library if you need to access this document.
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3.
(78)
Study of Z Pair Production and Anomalous Couplings in $e^+ e^-$ Collisions at $\sqrt{s}$ between 190 GeV and 209 GeV / OPAL Collaboration
A study of Z-boson pair production in e+e- annihilation at center-of-mass energies between 190 GeV and 209 GeV is reported. Final states containing only leptons, (l+l-l+l- and l+l-nn), quark and lepton pairs, (qql+l-, qqnn) and only hadrons (qqqq) are considered. [...]
hep-ex/0310013; CERN-EP-2003-049; CERN-EP-2003-049.- Geneva : CERN, 2003 - 35 p. - Published in : Eur. Phys. J. C 32 (2003) 303-322 Fulltext: ep-2003-049 - PDF; arXiv:hep-ex_0310013 - PDF; 0310013 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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4.
(78)
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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5.
(76)
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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6.
(76)
A Measurement of $R_{b}$ using a Double Tagging Method / OPAL Collaboration
The fraction of Z to bbbar events in hadronic Z decays has been measured by the OPAL experiment using the data collected at LEP between 1992 and 1995. The Z to bbbar decays were tagged using displaced secondary vertices, and high momentum electrons and muons. [...]
hep-ex/9810002; CERN-EP-98-137; CERN-EP-98-137.- Geneva : CERN, 1999 - 40 p. - Published in : Eur. Phys. J. C 8 (1999) 217-39 Fulltext: arXiv:hep-ex_9810002 - PDF; 9810002 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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7.
(75)
Measurements of the Cross Sections for Open Charm and Beauty Production in $\gamma\gamma$ Collisions at $\sqrt{s}$ = 189-202 GeV / L3 Collaboration
The production of c and b quarks in gamma-gamma collisions is studied with the L3 detector at LEP with 410 pb^-1 of data, collected at centre-of-mass energies from 189 GeV to 202 GeV. Hadronic final states containing c and b quarks are identified by detecting electrons or muons from their semileptonic decays. [...]
hep-ex/0011070; CERN-EP-2000-144; CERN-EP-2000-144; CERN-L3-226.- Geneva : CERN, 2001 - 17 p. - Published in : Phys. Lett. B 503 (2001) 10-20 Fulltext: 0011070 - PDF; arXiv:hep-ex_0011070 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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8.
(74)
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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9.
(73)
Determination of $A^{b}_{FB}$ at the Z pole using inclusive charge reconstruction and lifetime tagging / DELPHI Collaboration
A novel high precision method measures the b-quark forward-backward asymmetry at the Z pole on a sample of 3,560,890 hadronic events collected with the DELPHI detector in 1992 to 2000. An enhanced impact parameter tag provides a high purity b sample [...]
hep-ex/0412004; CERN-PH-EP-2004-062; CERN-PH-EP-2004-062.- Geneva : CERN, 2005 - 49 p. - Published in : Eur. Phys. J. C 40 (2005) 1-25 Fulltext: phep-2004-062 - PDF; arXiv:hep-ex_0412004 - PDF; 0412004 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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10.
(73)
Measurement of the b quark forward-backward asymmetry around the $Z^{0}$ peak using an inclusive tag / OPAL Collaboration
The b quark forward-backward asymmetry has been measured using hadronic Z0 decays collected by the OPAL experiment at LEP. Z0 -> bbbar decays were selected using a combination of secondary vertex and lepton tags, and the sign of the b quark charge was determined using an inclusive tag based on jet, vertex and kaon charges. [...]
hep-ex/0209076; CERN-EP-2002-053; CERN-EP-2002-053.- Geneva : CERN, 2002 - 24 p. - Published in : Phys. Lett. B 546 (2002) 29-47 Fulltext: arXiv:hep-ex_0209076 - PDF; ep-2002-053 - PDF; S0370269302025947 - XML; External link: Preprint - Please contact the library if you need to access this document.
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