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OPAL Papers

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2017-09-26
17:41
A Combination of Preliminary Results on Gauge Boson Couplings Measured by the LEP experiments
LEPEWWG-TGC-2003-01 ; DELPHI-2003-068-PHYS-936 ; L3-Note-2826 ; LEPEWWG-2006-01 ; OPAL-TN-739 ; ALEPH-2006-016-CONF-2003-012. - 2003. - 26 p.
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2013-02-14
16:50
Electroweak Measurements in Electron-Positron Collisions at W-Boson-Pair Energies at LEP / ALEPH Collaboration
Electroweak measurements performed with data taken at the electron-positron collider LEP at CERN from 1995 to 2000 are reported. The combined data set considered in this report corresponds to a total luminosity of about 3~fb$^{-1}$ collected by the four LEP experiments ALEPH, DELPHI, L3 and OPAL, at centre-of-mass energies ranging from $130~GeV$ to $209~GeV$ [...]
arXiv:1302.3415; CERN-PH-EP-2013-022; CERN-PH-EP-2013-022.- Geneva : CERN, 2013 - 126 p. - Published in : Phys. Rep. 532 (2013) 119-244 Draft (restricted): PDF; Fulltext: CERN-PH-EP-2013-022 - PDF; arXiv:1302.3415 - PDF; External link: Preprint

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2012-12-20
09:53
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

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2010-12-16
22:05
Determination of $\alpha_S$ using OPAL hadronic event shapes at $\sqrt{s}$ = 91 − 209 GeV and resummed NNLO calculations / OPAL Collaboration
Hadronic event shape distributions from e+e− annihilation measured by the OPAL experiment at centre-of-mass energies between 91 GeV and 209 GeV are used to determine the strong coupling αS. The results are based on QCD predictions complete to the next-to-next-to-leading order (NNLO), and on NNLO calculations matched to the resummed next-to-leading-log-approximation terms (NNLO+NLLA). [...]
arXiv:1101.1470; CERN-PH-EP-2010-089; CERN-PH-EP-2010-089.- Geneva : CERN, 2011 - 21 p. - Published in : Eur. Phys. J. C 71 (2011) 1733 Fulltext: CERN-PH-EP-2010-089 - PDF; arXiv:1101.1470 - PDF; External link: Preprint

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2010-12-13
09:12
Precision Electroweak Measurements and Constraints on the Standard Model / , ; Grunewald, M W (ed.)
This note presents constraints on Standard Model parameters using published and preliminary precision electroweak results measured at the electron-positron colliders LEP and SLC. [...]
arXiv:1012.2367 ; CERN-PH-EP-2010-095 ; FERMILAB-TM-2480-PPD ; LEPEWWG-2010-01 ; TEVEWWG-2010-01 ; ALEPH-2010-001-PHYSICS-2010-001 ; CDF-Note-10338 ; DELPHI-DELPHI-2010-001-PHYS 952 ; L3-Note-2837 ; OPAL-PR-432 ; SLAC-PUB-14301. - 2010. - 18 p.
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2009-11-16
17:28
Precision Electroweak Measurements and Constraints on the Standard Model / Alcaraz, J.
This note presents constraints on Standard Model parameters using published and preliminary precision electroweak results measured at the electron-positron colliders LEP and SLC. [...]
arXiv:0911.2604 ; CERN-PH-EP-2009-023 ; FERMILAB-TM-2446-E ; LEPEWWG-2009-01 ; TEVEWWG-2009-01 ; ALEPH-2009-001-PHYSICS-2009-001 ; CDF-NOTE-9979 ; D0-NOTE-6005 ; DELPHI-DELPHI-2009-PHYS-951 ; L3-NOTE-2836 ; OPAL-PR430 ; SLAC-PUB-13830 ; CERN-PH-EP-2009-023 ; FERMILAB-TM-2446-E ; LEPEWWG-2009-01 ; ALEPH-2009-001-PHYSICS-2009-001 ; CDF-Note-9979 ; D0-Note-6005 ; DELPHI-DELPHI-2009-PHYS-951 ; L3-Note-2836 ; OPAL-PR430 ; SLAC-PUB-13830. - 2009. - 18 p.
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2009-10-14
11:54
$\Sigma$-antihyperon correlations in $Z^{0}$ decay and investigation of the baryon production mechanism / OPAL Collaboration
Data collected around sqrt{s}=91 GeV by the OPAL experiment at the LEP e+e- collider are used to study the mechanism of baryon formation. As the signature, the fraction of Sigma-hyperons whose baryon number is compensated by the production of a Sigma-, Lambda or Xi- antihyperon is determined. [...]
arXiv:0910.2174; CERN-PH-EP-2009-013; CERN-PH-EP-2009-013.- 2009 - 32 p. - Published in : Eur. Phys. J. C 64 (2009) 609-625 Fulltext: arXiv:0910.2174 - PDF; 10052_2009_1175_OnlinePDF - PDF; External link: Preprint

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2009-02-05
17:42
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

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2008-12-02
13:53
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

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2008-12-01
13:26
Precision Electroweak Measurements and Constraints on the Standard Model
This note presents constraints on Standard Model parameters using published and preliminary precision electroweak results measured at the electron-positron colliders LEP and SLC. [...]
arXiv:0811.4682 ; CERN-PH-EP-2008-020 ; FERMILAB-TM-2420-E ; LEPEWWG-2008-01 ; TEVEWWG-2008-01 ; ALEPH-2008-001-PHYSIC-2008-001 ; CDF-Note-9610 ; D0-Note-5802 ; DELPHI-2008-001-PHYS-950 ; L3-Note-2834 ; OPAL-PR428. - 2008. - 18 p.
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