CERN Accelerating science

CERN Document Server 428 εγγραφές βρέθηκαν  1 - 10επόμενοτέλος  μετάβαση στην εγγραφή: Η έρευνα πήρε 0.63 δευτερόλεπτα. 
1.
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
2.
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
3.
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
4.
$\Sigma$-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
5.
Upgrade of the protection system for superconducting circuits in the LHC / Denz, R (CERN) ; Dahlerup-Petersen, K (CERN) ; Formenti, F (CERN) ; Meß, K H (CERN) ; Siemko, A (CERN) ; Steckert, J (CERN) ; Walckiers, L (CERN) ; Strait, J (Fermilab)
Prior to the re-start of the Large Hadron Collider LHC in 2009 the protection system for superconducting magnets and bus-bars QPS will be substantially upgraded. The foreseen modifications will enhance the capability of the system in detecting problems related to the electrical interconnections between superconducting magnets as well as the detection of so-called aperture symmetric quenches in the LHC main magnets..
CERN-ATS-2009-008.- Geneva : CERN, 2010 - 4 p. Published version from PAC09: PDF;
In : Particle Accelerator Conference 2009, Vancouver, Canada, 04 - 08 May 2009, pp.MO6PFP047
6.
Proposal to decrease the extraction times for dipoles and quadrupoles during the initial running of the LHC / Meß, K H (CERN)
The proposal to decrease the energy extraction time for the main dipoles and quadrupoles during the initial running up to 5 TeV is discussed. Proposals for practical solutions are presented..
LHC-Performance-Note-012; CERN-LHC-Performance-Note-012.- Geneva : CERN, 2009 - 5 p. Fulltext: PDF;
7.
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
8.
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
9.
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
10.
Extending the Application of HTS in Particle Accelerators / Ballarino, A (CERN) ; Meß, K H (CERN) ; Taylor, T (CERN)
The year-to-year improvements in the characteristics of high temperature superconductor (HTS) materials encourage periodic reappraisal of their applicability for use in accelerators. With the successful large-scale application of HTS technology for the current leads of the Large Hadron Collider at CERN, this tendency is accentuated, and the new materials are now starting to receive more serious attention as candidates for other accelerator-related applications. [...]
CERN-AT-2007-037-MEL.- Geneva : CERN, 2008 - 7 p. Preprint: PDF;
In : 8th European Conference on Applied Superconductivity, Brussels, Belgium, 16 - 20 Sep 2007, pp.012288

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