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CERN Document Server 找到 2,048 筆記錄  1 - 10下一個最後  跳到記錄: 檢索需時 1.08 秒. 
1.
(100)
Bose-Einstein Correlations of $\pi^{0}$ Pairs from Hadronic $Z^{0}$ Decays / OPAL Collaboration
We observed Bose-Einstein correlation in pi0 pairs produced in Z0 decays using the data sample collected by the OPAL detector at LEP 1 from 1991 to 1995. Using a static Gaussian picture for the pion emitter source, we obtain the chaoticity parameter lambda = 0.55 +- 0.10 +- 0.10 and the source radius R = (0.59 +- 0.08 +- 0.05) fm. [...]
hep-ex/0302027; CERN-EP-2003-005; CERN-EP-2003-005.- Geneva : CERN, 2003 - 19 p. - Published in : Phys. Lett. B 559 (2003) 131-143 Fulltext: arXiv:hep-ex_0302027 - PDF; ep-2003-005 - PDF; S037026930300337X - XML; External link: Preprint - Please contact the library if you need to access this document.
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2.
(91)
Transverse and Longitudinal Bose Einstein Correlations in hadronic $Z^0$ Decays / OPAL Collaboration
Bose-Einstein correlations in pairs of identical charged pions produced in asample of 4.3 million Z0 hadronic decays are studied as a function of the threecomponents of the momentum difference, transverse ("out" and "side") andlongitudinal with respect to the thrust direction of the event. A significantdifference between the transverse, r_t_side, and longitudinal, r_l, dimensionsis observed, indicating that the emitting source of identical pions, asobserved in the Longitudinally CoMoving System, has an elongated shape. [...]
hep-ex/0002062; CERN-EP-2000-004; CERN-EP-2000-004.- Geneva : CERN, 2000 - 19 p. - Published in : Eur. Phys. J. C 16 (2000) 423-433 Fulltext: 0002062 - PDF; arXiv:hep-ex_0002062 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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3.
(91)
Bose-Einstein correlations in $K^{\pm}K^{\pm}$ pairs from $Z^{0}$ decays into two hadronic jets / OPAL Collaboration
Bose-Einstein correlations in pairs of charged kaons produced in a sample of 3.9 million hadronic Z0 decays have been measured with the OPAL experiment at LEP. Charged kaons were identified in the central tracking detector using their specific energy loss in the drift chamber gas. [...]
hep-ex/0001045; CERN-EP-99-163; CERN-EP-99-163.- Geneva : CERN, 2001 - 25 p. - Published in : Eur. Phys. J. C 21 (2001) 23-32 Fulltext: arXiv:hep-ex_0001045 - PDF; 0001045 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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4.
(90)
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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5.
(89)
Bose-Einstein Correlations in $e^{+} e^{-} \to W^{+}W^{-}$ at 172 and 183 GeV / OPAL Collaboration
Bose-Einstein correlations between like-charge pions are studied in hadronic final states produced by e+e- annihilations at center-of-mass energies of 172 and 183 GeV. Three event samples are studied, each dominated by one of the processes W+W- to qqlnu, W+W- to qqqq, or (Z/g)* to qq. [...]
hep-ex/9811030; CERN-EP-98-174; CERN-EP-98-174.- Geneva : CERN, 1999 - 25 p. - Published in : Eur. Phys. J. C 8 (1999) 559-71 Fulltext: 9811030 - PDF; arXiv:hep-ex_9811030 - PDF; External link: hep-ex/9811030 PDF - Please contact the library if you need to access this document.
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6.
(84)
A Study of Three-Prong $\tau$ 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.
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7.
(81)
Genuine Correlations of Like-Sign Particles in Hadronic $Z^0$ Decays / OPAL Collaboration
Correlations among hadrons with the same electric charge produced in Z0 decays are studied using the high statistics data collected from 1991 through 1995 with the OPAL detector at LEP. Normalized factorial cumulants up to fourth order are used to measure genuine particle correlations as a function of the size of phase space domains in rapidity, azimuthal angle and transverse momentum. [...]
hep-ex/0110051; CERN-EP-2001-070; CERN-EP-2001-070.- Geneva : CERN, 2001 - 26 p. - Published in : Phys. Lett. B 523 (2001) 35-52 Fulltext: arXiv:hep-ex_0110051 - PDF; ep-2001-070 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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8.
(81)
A Study of One-Prong Tau Decays with a Charged Kaon / OPAL Collaboration
From an analysis of the ionisation energy loss of charged particles selected from 110326 e+e- -> tau+tau- candidates recorded by the OPAL detector at e+e- centre-of-mass energies near the Z0 resonance, we determine the one-prong tau decay branching ratios: Br(tau- -> nu_tau K- >=0h0) = 1.528 +- 0.039 +- 0.040 % Br(tau- -> nu_tau K-) = 0.658 +- 0.024 +- 0.029 % where the h0 notation refers to a pi0, an eta, a K^0_S, or a K^0_L, and where the first uncertainty is statistical and the second is systematic..
hep-ex/0009017; CERN-EP-2000-091; OPAL-PR-315; CERN-EP-2000-091.- Geneva : CERN, 2001 - 31 p. - Published in : Eur. Phys. J. C 19 (2001) 653-665 Fulltext: 0009017 - PDF; arXiv:hep-ex_0009017 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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9.
(77)
A measurement of the $\tau^{-} \to e^{-} \overline{\nu}_{e}\nu_{\tau}$ branching ratio / OPAL Collaboration
The branching ratio for the decay tau->e nue nutau has been measured using Z0 decay data collected by the OPAL experiment at LEP. In total 33073 tau->e nue nutau candidates were identified from a sample of 186197 selected tau decays, giving a branching ratio of 17.81 +- 0.09(stat) +_ 0.06(sys)%. [...]
hep-ex/9812017; CERN-EP-98-175; CERN-EP-98-175.- Geneva : CERN, 1999 - 17 p. - Published in : Phys. Lett. B 447 (1999) 134-146 Fulltext: arXiv:hep-ex_9812017 - PDF; 9812017 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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10.
(76)
Measurement of the $B^{+}$ and $B^{0}$ lifetimes and search for CP(T) violation using reconstructed secondary vertices / OPAL Collaboration
The lifetimes of the B+ and B0 mesons, and their ratio, have been measured in the OPAL experiment using 2.4 million hadronic Z0 decays recorded at LEP. Z0 -> b bbar decays were tagged using displaced secondary vertices and high momentum electrons and muons [...]
hep-ex/9901017; CERN-EP-98-195; CERN-EP-98-195.- Geneva : CERN, 2000 - 32 p. - Published in : Eur. Phys. J. C 12 (2000) 609-626 Fulltext: 9901017 - PDF; arXiv:hep-ex_9901017 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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