CERN Accelerating science

CERN Document Server 182 записей найдено  1 - 10следующийконец  перейти к записи: Поиск длился 0.68 секунд. 
1.
Measurement of the quark to photon fragmentation function through the inclusive production of prompt photons in hadronic $Z^0$ decays / OPAL Collaboration
The inclusive production of prompt photons with energy above 10 GeV is measured using the OPAL detector in hadronic Z^0 decays at LEP. In contrast to previous measurements, the prompt photons were not required to be isolated. [...]
hep-ex/9708020; CERN-PPE-97-086; CERN-PPE-97-86; CERN-PPE-97-086.- Geneva : CERN, 1998 - 24 p. - Published in : Eur. Phys. J. C 2 (1998) 39-48 Fulltext: PDF; External links: Fulltext; Fulltext
2.
Precision electroweak measurements on the $Z$ resonance / ALEPH Collaboration
We report on the final electroweak measurements performed with data taken at the Z resonance by the experiments operating at the electron-positron colliders SLC and LEP. The data consist of 17 million Z decays accumulated by the ALEPH, DELPHI, L3 and OPAL experiments at LEP, and 600 thousand Z decays by the SLD experiment using a polarised beam at SLC. [...]
hep-ex/0509008; SLAC-R-774; CERN-PH-EP-2005-041; SLAC-R-774; CERN-L3-304.- Geneva : CERN, 2006 - 302 p. ALEPH Papers - Published in : Phys. Rep. 427 (2006) 257 Fulltext: phep-2005-041 - PDF; arXiv:hep-ex_0509008 - PDF; External link: SLAC Document Server
3.
Bestimmung einer oberen Grenze fur die Masse des tau-Neutrinos mit dem OPAL-Detektor / Scharf, F
An upper limit for the tau -neutrino mass has been determined from the decay tau to 5 pi /sup +or-/ nu /sub tau / using data collected with the OPAL detector from 1991 to 1995 in e/sup +/e/sup -/ collisions at square root (s) $9 approximately=M/sub Z0/ [...]
BONN-IR-98-09. - Bonn : Bonn Univ., 1998.
4.
Searches for R-Parity Violating Decays of Gauginos at 183 GeV at LEP / OPAL Collaboration
Searches for pair-produced charginos and neutralinos with R-parity violating decays have been performed using a data sample corresponding to an integrated luminosity of 56 pb-1 collected with the OPAL detector at LEP at a centre-of-mass energy of 183 GeV. An important consequence of R-parity violation is that the lightest supersymmetric particle becomes unstable. [...]
hep-ex/9901037; CERN-EP-98-203; CERN-EP-98-203.- Geneva : CERN, 1999 - 57 p. - Published in : Eur. Phys. J. C 11 (1999) 619-642 Fulltext: 9901037 - PDF; arXiv:hep-ex_9901037 - PDF; External link: Preprint - Please contact the library if you need to access this document.
5.
Measurement of the W Mass and Width in $e^{+}e^{-}$ Collisions at 183 GeV / OPAL Collaboration
Using a data sample of 57 pb-1 recorded at a centre-of-mass energy of 183 GeV with the Opal detector at LEP, 282 W+W- -> qqqq and 300 W+W- -> qqlnu candidate events are used to obtain a measurement of the mass of the W boson, W_W = 80.39 +- 0.13(stat.) +- 0.05(syst.) GeV assuming the Standard Model relation between M_W and Gam_W. A second fit provides a direct measure of the width of the W boson and gives Gam_W = 1.96 +- 0.34(stat.) +- 0.20(syst.) GeV. [...]
hep-ex/9901025; CERN-EP-98-197; CERN-EP-98-197.- Geneva : CERN, 1999 - 22 p. - Published in : Phys. Lett. B 453 (1999) 138-52 Fulltext: 9901025 - PDF; arXiv:hep-ex_9901025 - PDF; External link: hep-ex/9901025 PDF - Please contact the library if you need to access this document.
6.
Colour reconnection studies in $e^{+}e^{-} \to W^{+}W^{-}$ at $\sqrt{s}$=183 GeV / OPAL Collaboration
The predicted effects of final state interactions such as colour reconnection are investigated by measuring properties of hadronic decays of W bosons, recorded at a centre-of-mass energy of sqrt(s)=182.7 GeV in the OPAL detector at LEP. Dependence on the modelling of hadronic W decays is avoided by comparing W+W- -> qqqq events with the non-leptonic component of W+W- -> qqlnu events. [...]
hep-ex/9901019; CERN-PPE-98-196; CERN-PPE-98-0196; CERN-EP-98-196; CERN-EP-98-196.- Geneva : CERN, 1999 - 21 p. - Published in : Phys. Lett. B 453 (1999) 153-8 Fulltext: 9901019 - PDF; arXiv:hep-ex_9901019 - PDF; External link: Preprint - Please contact the library if you need to access this document.
7.
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.
8.
Search for Baryon and Lepton Number Violating $Z^0$ Decays / OPAL Collaboration
Using data collected with the OPAL detector at LEP, we have searched for the processes e+e- -> Z0 -> p e-, p mu- and the charge conjugate final-states. These would violate the conservation of the baryon-number B, lepton-number L and the fermion-number n = (B+L). [...]
hep-ex/9901011; CERN-EP-98-194; CERN-EP-98-194.- Geneva : CERN, 1999 - 17 p. - Published in : Phys. Lett. B 447 (1999) 157 Fulltext: 9901011 - PDF; arXiv:hep-ex_9901011 - PDF; 9901011.figure2 - PS.GZ; 9901011.figure1 - PS.GZ; External link: Preprint - Please contact the library if you need to access this document.
9.
A Measurement of the Product Branching Ratio $f(b \to \Lambda_{b}).BR (\Lambda_{b} \to \Lambda X)$ in $Z^{0}$ Decays / OPAL Collaboration
The product branching ratio, f(b->Lambda_b).BR(Lambda_b->Lambda X), where Lambda_b denotes any weakly-decaying b-baryon, has been measured using the OPAL detector at LEP. Lambda_b are selected by the presence of energetic Lambda particles in bottom events tagged by the presence of displaced secondary vertices. [...]
hep-ex/9812018; CERN-EP-98-186; CERN-EP-98-186.- Geneva : CERN, 1999 - 17 p. - Published in : Eur. Phys. J. C 9 (1999) 1-9 Fulltext: 9812018 - PDF; arXiv:hep-ex_9812018 - PDF; External link: Preprint - Please contact the library if you need to access this document.
10.
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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