CERN Accelerating science

CERN Document Server 2,051 εγγραφές βρέθηκαν  1 - 10επόμενοτέλος  μετάβαση στην εγγραφή: Η έρευνα πήρε 1.09 δευτερόλεπτα. 
1.
Tests of the Standard Model and Constraints on New Physics from Measurements of Fermion-Pair Production at 189-209 GeV at LEP / OPAL Collaboration
Cross-section and angular distributions for hadronic and lepton-pair final states in e+e- collisions at centre-of-mass energies between 189 GeV and 209 GeV, measured with the OPAL detector at LEP, are presented and compared with the predictions of the Standard Model. The measurements are used to determine the electromagnetic coupling constant alphaem at LEP2 energies. [...]
hep-ex/0309053; CERN-EP-2003-053; CERN-EP-2003-053.- Geneva : CERN, 2004 - 80 p. - Published in : Eur. Phys. J. C 33 (2004) 173-212 Fulltext: arXiv:hep-ex_0309053 - PDF; ep-2003-053 - PDF; External link: Preprint - Please contact the library if you need to access this document.
2.
Search for Lepton Flavour Violation in $e^+e^-$ Collisions at $\sqrt{s}$ = 189 - 209 GeV / OPAL Collaboration
We search for lepton flavour violating events (e mu, e tau and mu tau) that could be directly produced in e+e- annihilations, using the full available data sample collected with the OPAL detector at centre-of-mass energies between 189 GeV and 209 GeV. In general, the Standard Model expectations describe the data well for all the channels and at each sqrt(s). [...]
hep-ex/0109011; CERN-EP-2001-061; CERN-EP-2001-061.- Geneva : CERN, 2001 - 16 p. - Published in : Phys. Lett. B 519 (2001) 23-32 Fulltext: S0370269301010863 - XML; arXiv:hep-ex_0109011 - PDF; 0109011 - PDF; External link: Preprint - Please contact the library if you need to access this document.
3.
Measurement of the Low-x Behaviour of the Photon Structure Function $F2-\gamma$ / OPAL Collaboration
The photon structure function F2-gamma(x,Q**2) has been measured using data taken by the OPAL detector at centre-of-mass energies of 91Gev, 183Gev and 189Gev, in Q**2 ranges of 1.5 to 30.0 GeV**2 (LEP1), and 7.0 to 30.0 GeV**2 (LEP2), probing lower values of x than ever before. Since previous OPAL analyses, new Monte Carlo models and new methods, such as multi-variable unfolding, have been introduced, reducing significantly the model dependent systematic errors in the measurement..
hep-ex/0007018; CERN-EP-2000-082; CERN-EP-2000-082.- Geneva : CERN, 2000 - 50 p. - Published in : Eur. Phys. J. C 18 (2000) 15-39 Fulltext: arXiv:hep-ex_0007018 - PDF; 0007018 - PDF; External link: Preprint - Please contact the library if you need to access this document.
4.
Measurement of the $e^+ e^- \to W^+ W^-\gamma$ Cross-section and Limits on Anomalous Quartic Gauge Couplings with DELPHI / DELPHI Collaboration
W+W-gamma production at LEP2 is studied using data collected with the DELPHI detector at centre-of-mass energies between 189 GeV and 209 GeV, corresponding to an integrated luminosity of about 600 pb^-1. Cross-sections are measured for the production of W+W- with a hard, central and isolated photon in the final state, and are found to be compatible with the Standard Model prediction. [...]
hep-ex/0311004; CERN-EP-2003-045; CERN-EP-2003-045.- Geneva : CERN, 2003 - 14 p. - Published in : Eur. Phys. J. C 31 (2003) 139-147 Fulltext: 0311004 - PDF; arXiv:hep-ex_0311004 - PDF; External link: Preprint - Please contact the library if you need to access this document.
5.
Measurement of the W-pair Production Cross-section and W Branching Ratios in $e^+ e^-$ Collisions at $\sqrt{s}$ = 161-209 GeV / DELPHI Collaboration
These final results on e+e- -> W+W- production cross-section measurements at LEP2 use data collected by the DELPHI detector at centre-of-mass energies up to 209 GeV. Measurements of total cross-sections, W angular differential distributions and decay branching fractions, and the value of the CKM element |V_{cs}| are compared to the expectations of the Standard Model. [...]
hep-ex/0403042; CERN-EP-2003-071; CERN-EP-2003-071.- Geneva : CERN, 2004 - 33 p. - Published in : Eur. Phys. J. C 34 (2004) 127-144 Fulltext: PDF; External link: Preprint - Please contact the library if you need to access this document.
6.
W Boson Polarisation at LEP2 / OPAL Collaboration
Elements of the spin density matrix for W bosons in e+e- -> W+W- -> qqln events are measured from data recorded by the OPAL detector at LEP. This information is used calculate polarised differential cross-sections and to search for CP-violating effects. [...]
hep-ex/0312047; CERN-EP-2003-088; CERN-EP-2003-088.- Geneva : CERN, 2004 - 20 p. - Published in : Phys. Lett. B 585 (2004) 223-36 Fulltext: arXiv:hep-ex_0312047 - PDF; ep-2003-088 - PDF; External link: Preprint - Please contact the library if you need to access this document.
7.
Search for Single Top Quark Production at LEP2 / OPAL Collaboration
A search for single top quark production via flavour changing neutral currents (FCNC) was performed with data collected by the OPAL detector at the e+e- collider LEP. Approximately 600 pb-1 of data collected at sqrt(s) = 189 - 209 GeV were used to search for the FCNC process e+ e- -> tc(u) -> bWc(u). [...]
hep-ex/0110009; CERN-EP-2001-066; CERN-EP-2001-066.- Geneva : CERN, 2001 - 22 p. - Published in : Phys. Lett. B 521 (2001) 181-194 Fulltext: S0370269301011959 - XML; arXiv:hep-ex_0110009 - PDF; ep-2001-066 - PDF; External link: Preprint - Please contact the library if you need to access this document.
8.
Measurement of Neutral-Current Four-Fermion Production at LEP2 / OPAL Collaboration
Four-fermion final states qqbar e+e- and qqbar mu+mu- from neutral-current interactions in e+e- collisions are studied in the OPAL detector at LEP at centre-of-mass energies from 183 GeV to 209 GeV. The data analysed correspond to a total integrated luminosity of about 650 pb-1 recorded from 1997 to 2000. [...]
hep-ex/0210026; CERN-EP-2002-052; CERN-EP-2002-052.- Geneva : CERN, 2002 - 21 p. - Published in : Phys. Lett. B 544 (2002) 259-273 Fulltext: arXiv:hep-ex_0210026 - PDF; ep-2002-052 - PDF; S0370269302024681 - XML; External link: Preprint - Please contact the library if you need to access this document.
9.
Bose-Einstein correlations in $W^{+}W^{-}$ events at LEP2 / DELPHI Collaboration
Bose-Einstein correlations (BEC) between final state particles in the reaction e+e- -> W+W- -> q_1 anti-q_2 q_3 anti-q_4 have been studied. Data corresponding to a total integrated luminosity of 550 pb^{-1}, recorded by the DELPHI detector at centre-of-mass energies ranging from 189 to 209 GeV, were analysed. [...]
hep-ex/0507066; CERN-PH-EP-2004-072; CERN-PH-EP-2004-072.- Geneva : CERN, 2005 - 22 p. - Published in : Eur. Phys. J. C 44 (2005) 161-174 Fulltext: arXiv:hep-ex_0507066 - PDF; 0507066 - PDF; External link: Preprint
10.
Study of double-tagged $\gamma\gamma$ events at LEP2 / DELPHI Collaboration
Double-tagged interactions of photons with virtualities Q^2 between 10 GeV^2 and 200 GeV^2 are studied with the data collected by DELPHI at LEPII from 1998 to 2000, corresponding to an integrated luminosity of 550 pb^{-1}. The gam* gam* -> mu+mu- data agree with QED predictions. [...]
hep-ex/0604039; CERN-PH-EP-2005-029; CERN-PH-EP-2005-029.- Geneva : CERN, 2006 - 17 p. - Published in : Eur. Phys. J. C 46 (2006) 559-568 Fulltext: arXiv:hep-ex_0604039 - PDF; 0604039 - PDF; phep-2005-029 - PDF; External link: Preprint

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