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CERN Document Server Encontrados 2,045 registros  1 - 10siguientefinal  ir al registro: La búsqueda tardó 1.51 segundos. 
1.
(100)
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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2.
(91)
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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3.
(90)
Measurement of the $B^0_s$ Lifetime and Study of $B^0_s - \overline{B^0_s}$ Oscillations using $D_{s}l$ Events / DELPHI Collaboration
Lifetime and oscillations of $\Bs$ mesons have been studied in eventswith a large transverse momentum lepton and a $\Ds$ of opposite electric charge>the same hemisphere, selected from about 3.6 million hadronic $\Zz$decays accumulated by DELPHI between 1992 and 1995. \\The $\Bs$ lifetime and the fractional width difference between the two physical>
hep-ex/0107077; CERN-EP-2000-043; CERN-EP-2000-043.- Geneva : CERN, 2000 - 47 p. - Published in : Eur. Phys. J. C 16 (2000) 555-578 Fulltext: ep-2000-043 - PDF; arXiv:hep-ex_0107077 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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4.
(90)
Measurement of $R_{b}$ and $B_{r}(b \to l\nu X)$ at LEP Using Double-Tag Methods / L3 Collaboration
We present a combined measurement of $\Rb = \Gamma(\mathrm{Z \rightarrow b\overline{b}}) / \Gamma(\mathrm{Z} \rightarrow\mbox{hadro ns})$ and the semileptonic branching ratio of b quarks in Z decays, $\Brbl$, using double-tag methods. Two analyses are performed on one million hadronic Z decays collected in 1994 and 1995 [...]
hep-ex/9909045; CERN-EP-99-121; CERN-EP-99-121; CERN-L3-185.- Geneva : CERN, 2000 - 32 p. - Published in : Eur. Phys. J. C 13 (2000) 47-61 Fulltext: arXiv:hep-ex_9909045 - PDF; ep-99-121 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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5.
(90)
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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6.
(86)
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.
(85)
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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8.
(85)
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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9.
(85)
b-tagging in DELPHI at LEP / DELPHI Collaboration
The standard method used for tagging b-hadrons in the DELPHI experiment at the CERN LEP Collider is discussed in detail. The main ingredient of b-tagging is the impact parameters of tracks, which relies mostly on the vertex detector. [...]
hep-ex/0311003; CERN-EP-2002-088; CERN-EP-2002-088.- Geneva : CERN, 2004 - 50 p. - Published in : Eur. Phys. J. C 32 (2004) 185-208 Fulltext: ep-2002-088 - PDF; arXiv:hep-ex_0311003 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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10.
(84)
Search for the sgoldstino at $\sqrt{s}$ from 189 to 202 GeV / DELPHI Collaboration
A search for the supersymmetric partner of the goldstino, the sgoldstino S, at LEP2 is presented. The production S$\gLWahlen, H
hep-ex/0102044; CERN-EP-2000-110; CERN-EP-2000-110.- Geneva : CERN, 2000 - 15 p. - Published in : Phys. Lett. B 494 (2000) 203 Fulltext: ep-2000-110 - PDF; arXiv:hep-ex_0102044 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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