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CERN Document Server Znaleziono 71 rekordów  1 - 10następnykoniec  skocz do rekordu: Szukanie trwało 1.51 sekund. 
1.
Search for Charged Higgs bosons: Combined Results Using LEP data / ALEPH, DELPHI, L3 and OPAL Collaborations
The four LEP collaborations, ALEPH, DELPHI, L3 and OPAL, have searched for pair-produced charged Higgs bosons in the framework of Two Higgs Doublet Models (2HDMs). The data of the four experiments are statistically combined. [...]
arXiv:1301.6065; CERN-PH-EP-2012-369; CERN-PH-EP-2012-369; LHWG-Note-2012-01; ALEPH-2012-001-PHYSICS-2012-001; DELPHI-2012-001-PHYS-953; L3-Note-2835; OPAL-PR433.- Geneva : CERN, 2013 - 18 p. - Published in : Eur. Phys. J. C 73 (2013) 2463 Draft (restricted): PDF; Fulltext: CERN-PH-EP-2012-369 - PDF; arXiv:1301.6065 - PDF; External link: Preprint
2.
Measurement of $\alpha_{s}$ with Radiative Hadronic Events / OPAL Collaboration
Hadronic final states with a hard isolated photon are studied using data taken at centre-of-mass energies around the mass of the Z0 boson with the OPAL detector at LEP. The strong coupling alpha S is extracted by comparing data and QCD predictions for event shape observables at average reduced centre-of-mass energies ranging from 24 GeV to 78 GeV, and the energy dependence of alpha S is studied. [...]
arXiv:0902.1128; CERN-PH-EP-2007-032; CERN-PH-EP-2007-032.- Geneva : CERN, 2008 - 31 p. - Published in : Eur. Phys. J. C 53 (2008) 21-39 Fulltext: arXiv:0902.1128 - PDF; CERN-PH-EP-2007-032 - PDF; Springer Open Access article: PDF; External link: Fulltext
3.
Search for Charged Higgs Bosos in $e^{+}e^{-}$ Collisions at $\sqrt{s}$ = 189-209 GeV / OPAL collaboration
A search is made for charged Higgs bosons predicted by Two-Higgs-Doublet extensions of the Standard Model (2HDM) using electron-positron collision data collected by the OPAL experiment at sqrts=189-209 GeV, corresponding to an integrated luminosity of approximately 600pb-1. Charged Higgs bosons are assumed to be pair-produced and to decay into qq, tnt or AWpm. [...]
arXiv:0812.0267; CERN-PH-EP-2008-016; CERN-PH-EP-2008-016.- Geneva : CERN, 2012-07-24 - 32 p. - Published in : Eur. Phys. J. C 72 (2012) 2076 Fulltext: PDF; External links: Fulltext; Fulltext
4.
Measurement of the $e^+ e^- \to W^+ W^-$ cross section and W decay branching fractions at LEP / OPAL Collaboration
From a total data sample of 701.1 pb^-1 recorded with e+e- centre-of-mass energies of sqrt = 161-209 GeV with the OPAL detector at LEP, 11693 W-pair candidate events are selected. These data are used to obtain measurements of the W-pair production cross sections at 10 different centre-of-mass energies. [...]
arXiv:0708.1311; CERN-PH-EP-2007-027; OPAL-PR-424; CERN-PH-EP-2007-027.- Geneva : CERN, 2007 - 33 p. - Published in : Eur. Phys. J. C 52 (2007) 767-785 Fulltext: arXiv:0708.1311 - PDF; phep-2007-027 - PDF; External link: DURHAM
5.
Bose-Einstein study of position-momentum correlations of charged pions in hadronic $Z^{0}$ decays / OPAL Collaboration
A study of Bose-Einstein correlations in pairs of identically charged pions produced in e+e- annihilations at the Z0 peak has been performed for the first time assuming a non-static emitting source. The results are based on the high statistics data obtained with the OPAL detector at LEP. [...]
arXiv:0708.1122; CERN-PH-EP-2007-025; OPAL-PR423; CERN-PH-EP-2007-025.- Geneva : CERN, 2007 - 25 p. - Published in : Eur. Phys. J. C 52 (2007) 787-803 Fulltext: phep-2007-025 - PDF; arXiv:0708.1122 - PDF; External link: Preprint
6.
Inclusive Production of Charged Hadrons in Photon-Photon Collisions / OPAL Collaboration
The inclusive production of charged hadrons in the collisions of quasi-real photons e+e- -> e+e- +X has been measured using the OPAL detector at LEP. The data were taken at e+e- centre-of-mass energies from 183 to 209 GeV. [...]
hep-ex/0612045; CERN-PH-EP-2006-038; CERN-PH-EP-2006-038.- Geneva : CERN, 2007 - 21 p. - Published in : Phys. Lett. B 651 (2007) 92-101 Fulltext: arXiv:hep-ex_0612045 - PDF; 0612045 - PDF; phep-2006-038 - PDF; External link: Preprint
7.
Search for Invisibly Decaying Higgs Bosons with Large Decay Width Using the OPAL Detector at LEP / OPAL Collaboration
This paper describes a topological search for an invisibly decaying Higgs boson,H, produced via the Bjorken process (e+e- -> HZ). The analysis is based on data recorded using the OPAL detector at LEP at centre-of-mass energies from 183 to 209 GeV corresponding to a total integrated luminosity of 629pb-1. [...]
hep-ex/0610056; OPAL-PR-417; CERN-PH-EP-2006-026; CERN-PH-EP-2006-026; OPAL-PR-417.- Geneva : CERN, 2007 - 30 p. - Published in : Eur. Phys. J. C 49 (2007) 457-472 Fulltext: 0610056 - PDF; phep-2006-026 - PDF; arXiv:hep-ex_0610056 - PDF; External link: hep-ex/0610056 PDF
8.
CMS Physics : Technical Design Report Volume 2: Physics Performance / Bayatian, G L
CERN-LHCC-2006-021 CMS-TDR-8-2. - Geneva : CERN, 2007. - 669 p. (Technical design report. CMS ; 8.2)


10.1088/0954-3899/34/6/S01
9.
QCD coherence and correlations of particles with restricted momenta in hadronic Z decays / OPAL Collaboration
QCD coherence effects are studied based on measurements of correlations of particles with either restricted transverse momenta, pT<pTcut, where pT is defined with respect to the thrust axis, or restricted absolute momenta, p equiv |p| < pcut, using about four million hadronic Z decays recorded at LEP with the OPAL detector. The correlations are analyzed in terms of normalized factorial and cumulant moments. [...]
hep-ex/0604003; CERN-PH-EP-2006-003; CERN-PH-EP-2006-003.- Geneva : CERN, 2006 - 17 p. - Published in : Phys. Lett. B 638 (2006) 30-38 Fulltext: S0370269306005703 - XML; 0604003 - PDF; phep-2006-003 - PDF; arXiv:hep-ex_0604003 - PDF; External link: Preprint
10.
Measurement of the strong coupling $\alpha^{s}$ from four-jet observables in $e^{+}e^{-}$ annihilation / OPAL Collaboration
Data from e+e- annihilation into hadrons at centre-of-mass energies between 91 GeV and 209 GeV collected with the OPAL detector at LEP, are used to study the four-jet rate as a function of the Durham algorithm resolution parameter ycut. The four-jet rate is compared to next-to-leading order calculations that include the resummation of large logarithms. [...]
hep-ex/0601048; CERN-PH-EP-2005-057; CERN-PH-EP-2005-057.- Geneva : CERN, 2006 - 25 p. - Published in : Eur. Phys. J. C 47 (2006) 295-307 Fulltext: phep-2005-057 - PDF; 0601048 - PDF; arXiv:hep-ex_0601048 - PDF; External link: Preprint

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