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CERN Document Server 2,049 Datensätze gefunden  1 - 10nächsteEnde  gehen zum Datensatz: Die Suche hat 1.26 Sekunden gedauert. 
1.
(100)
Measurement of the branching fractions and forward-backward asymmetries of the $Z^0$ into light quarks / OPAL Collaboration
Using approximately 4.3 million hadronic Z^0 decays collected with the OPAL detector at LEP between 1990 and 1995, we measure the branching fractions of the Z^0 into up-type and down-type light quarks, R_q, and the forward-backward asymmetries, A_FB(q), using high-momentum stable particles as a tag. Adopting a method that employs double tagged events to determine the flavour tagging efficiencies, and assuming the flavour independence of strong interactions and SU(2) isospin symmetry, we measure: R_{d,s}/(R_d + R_u + R_s) = 0.371 +/- 0.016(stat.) +/- 0.016(syst.) and A_FB(d,s) = 0.068 +/- 0.035(stat.) +/- 0.011(syst.), assuming the branching fractions and forward-backward asymmetries of down and strange quarks to be equal. [...]
hep-ex/9707019; CERN-PPE-97-063; CERN-PPE-97-63; CERN-PPE-97-063.- Geneva : CERN, 1997 - 34 p. - Published in : Z. Phys. C 76 (1997) 387-400 Fulltext: 9707019 - PDF; arXiv:hep-ex_9707019 - PDF; External link: hep-ex/9707019 PDF - Please contact the library if you need to access this document.
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2.
(91)
Polarization and forward-backward asymmetry of $\Lambda$ baryons in hadronic $Z^0$ decays / OPAL Collaboration
The longitudinal polarization, the transverse polarization, and the forward-backward asymmetry of Lambda baryons have been measured using a sample of 4.34 million hadronic Z^0 decays collected with the OPAL detector at LEP between 1990 and 1995. These results are important as an aid to the understanding of hadronization mechanisms. [...]
hep-ex/9708027; CERN-PPE-97-104; CERN-PPE-97-104.- Geneva : CERN, 1998 - 22 p. - Published in : Eur. Phys. J. C 2 (1998) 49-59 Fulltext: 9708027 - PDF; arXiv:hep-ex_9708027 - PDF; ppe-97-104 - PDF; External link: Rivet analyses reference - Please contact the library if you need to access this document.
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3.
(77)
Bose-Einstein correlations of three charged pions in hadronic $Z^{0}$ decays / OPAL Collaboration
Bose-Einstein Correlations (BEC) of three identical charged pions were studied in 4 x 10^6 hadronic Z^0 decays recorded with the OPAL detector at LEP. The genuine three-pion correlations, corrected for the Coulomb effect, were separated from the known two-pion correlations by a new subtraction procedure. [...]
hep-ex/9806036; CERN-EP-98-068; CERN-EP-98-68; CERN-EP-98-068.- Geneva : CERN, 1998 - 19 p. - Published in : Eur. Phys. J. C 5 (1998) 239-248 Fulltext: arXiv:hep-ex_9806036 - PDF; 9806036 - PDF; External link: hep-ex/9806036 PDF - Please contact the library if you need to access this document.
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4.
(74)
Measurement of the Forward-Backward Asymmetries of $e^+ e^- \to Z \to b\bar{b}$ and $e^+ e^- \to Z \to c\bar{c}$ using prompt leptons / DELPHI Collaboration
The forward-backward asymmetries of the processes e+e- -> Z -> b bbar and e+e- -> Z -> c cbar were measured from a sample of hadronic Z decays collected by the DELPHI experiment between 1993 and 1995. Enriched samples of b bbar and c cbar events were obtained using lifetime information. [...]
hep-ex/0403041; CERN-EP-2003-083; CERN-EP-2003-083.- Geneva : CERN, 2004 - 25 p. - Published in : Eur. Phys. J. C 34 (2004) 109-125 Fulltext: PDF; External link: Preprint - Please contact the library if you need to access this document.
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5.
(72)
Measurements of the $b\overline{b}$ production cross section and forward- backward asymmetry at centre-of-mass energies above the Z pole at LEP / L3 Collaboration
The measurements of $R_{b} = \sigma(e^+e^-} \to b\overline{b})/\sigma( e^+e^-} \to{m q\overline{q})$ and of the b quarkforward--backward charge asymmetry,$A_fb}^{b}$, at centre--of--mass energies above the Z pole are described. The measurement of $R_{b}$ is performed at $\sqrt{s}$ between 130 and 189 GeV using a b--tagging method thatexploits the relatively large decay length ofb--hadrons [...]
hep-ex/0005023; CERN-EP-2000-054; CERN-EP-2000-054; CERN-L3-207.- Geneva : CERN, 2000 - 22 p. - Published in : Phys. Lett. B 485 (2000) 71-84 Fulltext: arXiv:hep-ex_0005023 - PDF; ep-2000-054 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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6.
(70)
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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7.
(69)
Measurement of the Forward-Backward Asymmetry of $c$ and $b$ Quarks at the $Z$ Pole using Reconstructed $D$ Mesons / DELPHI Collaboration
A measurement of the forward--backward asymmetry of $e^{+}e^{-} \to c\bar{c}$ and $e^{+}e^{-} \to b\bar{b}$ on the $Z$ resonance is performed using about 3.5 million hadronic $Z$ decays collected by the DELPHI detector at LEP in the years 1992 to 1995. The heavy quark is tagged by the exclusive reconstruction of several $D$ meson decay modes [...]
hep-ex/9903074; CERN-EP-99-007; CERN-EP-99-07; CERN-EP-99-7; CERN-EP-99-007.- Geneva : CERN, 1999 - 31 p. - Published in : Eur. Phys. J. C 10 (1999) 219-37 Fulltext: arXiv:hep-ex_9903074 - PDF; ep-99-007 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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8.
(67)
A measurement of the branching fractions of the b-quark into charged and neutral b-hadrons / DELPHI Collaboration
The production fractions of charged and neutral b-hadrons in b-quark events from Z0 decays have been measured with the DELPHI detector at LEP. An algorithm has been developed, based on a neural network, to estimate the charge of the weakly-decaying b-hadron by distinguishing its decay products from particles produced at the primary vertex. [...]
hep-ex/0311005; CERN-EP-2003-044; CERN-EP-2003-044.- Geneva : CERN, 2003 - 14 p. - Published in : Phys. Lett. B 576 (2003) 29-42 Fulltext: 0311005 - PDF; arXiv:hep-ex_0311005 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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9.
(66)
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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10.
(65)
A Precise Measurement of the $B^{+}, B^{0}$ and Mean b-hadron Lifetime with the DELPHI Detector at LEP I / DELPHI Collaboration
Final results from the DELPHI Collaboration on the lifetime of B+ and B0 mesons and the mean b-hadron lifetime, are presented using the data collected at the Z0 peak in 1994 and 1995. Elaborate, inclusive, secondary vertexing methods have been employed to ensure a b-hadron reconstruction with good efficiency. [...]
hep-ex/0401025; CERN-EP-2003-065; CERN-EP-2003-065.- Geneva : CERN, 2004 - 30 p. - Published in : Eur. Phys. J. C 33 (2004) 307-324 Fulltext: arXiv:hep-ex_0401025 - PDF; 0401025 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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