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CERN Document Server 2,051 εγγραφές βρέθηκαν  1 - 10επόμενοτέλος  μετάβαση στην εγγραφή: Η έρευνα πήρε 1.18 δευτερόλεπτα. 
1.
(100)
Multi-Photon Events with Large Missing Energy in $e^{+}e^{-}$ Collisions at $\sqrt{s}=192-209 GeV$ / OPAL Collaboration
Events with a final state consisting of two or more photons and large missing transverse energy have been observed in e+e- collisions at centre-of-mass energies in the range 192 - 209 GeV using the OPAL detector at LEP. Cross-section measurements are performed within the kinematic acceptance of the selection and compared with the expectation from the Standard Model process e+e- -> nu nu gamma gamma(gamma). [...]
hep-ex/0412011; CERN-PH-EP-2004-035.- Geneva : CERN, 2004-10-12 - 13 p. - Published in : Phys. Lett. B 602 (2004) 167-179 Fulltext: 0412011 - PDF; arXiv:hep-ex_0412011 - PDF; S037026930401370X - XML; External link: hep-ex/0412011 PDF - Please contact the library if you need to access this document.
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2.
(91)
Search for Chargino and Neutralino Production at $\sqrt{s}$ = 192-209 GeV at LEP / OPAL Collaboration
Approximately 438 pb-1 of e+e- data from the OPAL detector, taken with the LEP collider running at centre-of-mass energies of 192-209 Gev, are analyzed to search for evidence of chargino pair production, e+e- -> tilde chi^+_1 tilde chi^-_1, or neutralino associated production, e+e- -> tilde chi^0_2 tilde chi^0_1. Limits are set at the 95% confidence level on the product of the cross-section for the process e+e- -> tilde chi^+_1 tilde chi^-_1 and its branching ratios to topologies containing jets and missing energy, of jest with a lepton and missing energy, and on the product of the cross-section for e+e- -> tilde chi^0_2 tilde chi^0_1 and its branching ratio to jets. [...]
hep-ex/0401026; CERN-EP-2003-090; CERN-EP-2003-090.- Geneva : CERN, 2004 - 34 p. - Published in : Eur. Phys. J. C 35 (2004) 1-20 Fulltext: 0401026 - PDF; arXiv:hep-ex_0401026 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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3.
(80)
Search for anomalous production of photonic events with missing energy in $e^+ e^-$ collisions at $\sqrt{s}$ = 130-172 GeV / OPAL Collaboration
Photonic events with large missing energy have been observed in e+e- collisions at centre-of-mass energies of 130, 136, 161 and 172 GeV using the OPAL detector at LEP. Results are presented based on search topologies designed to select events with a single photon and missing transverse energy or events with a pair of acoplanar photons. [...]
hep-ex/9801024; CERN-PPE-97-132; CERN-PPE-97-132.- Geneva : CERN, 1998 - 40 p. - Published in : Eur. Phys. J. C 2 (1998) 607-625 Fulltext: arXiv:hep-ex_9801024 - PDF; 9801024 - PDF; External link: hep-ex/9801024 PDF - Please contact the library if you need to access this document.
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4.
(75)
Photon Events with Missing Energy in $e^{+}e^{-}$ Collisions at $\sqrt{s}$ = 130 to 209 GeV / DELPHI Collaboration
The production of single- and multi-photon events has been studied in the reaction e+e- -> gamma (gamma) + invisible particles. The data collected with the DELPHI detector during the years 1999 and 2000 at centre-of-mass energies between 191 GeV and 209 GeV was combined with earlier data to search for phenomena beyond the Standard Model. [...]
hep-ex/0406019; CERN-EP-2003-093; CERN-EP-2003-093.- Geneva : CERN, 2005 - 33 p. - Published in : Eur. Phys. J. C 38 (2005) 395-411 Fulltext: arXiv:hep-ex_0406019 - PDF; 0406019 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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5.
(74)
Z-boson production with two unobserved, back-to-back, hard photons at LEP / L3 Collaboration
The double-radiative process e+e- -> Z gamma gamma -> q q~ gamma gamma, where the two hard photons escape detection at low polar angles into opposite directions, is studied in 0.62/fb of data collected with the L3 detector at LEP at centre-of-mass energies between 188.6GeV and 209.2GeV. The cross sections are measured and found to be consistent with the Standard Model expectations..
hep-ex/0504015; CERN-PH-EP-2005-006; CERN-L3-296; CERN-PH-EP-2005-006.- Geneva : CERN, 2005 - 15 p. - Published in : Phys. Lett. B 613 (2005) 118-127 Fulltext: 0504015 - PDF; arXiv:hep-ex_0504015 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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6.
(71)
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.
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7.
(70)
ZZ production in $e^{+}e^{-}$ interactions at $\sqrt{s}$ = 183 - 209 GeV / DELPHI Collaboration
Measurements of on-shell ZZ production are described, using data from the DELPHI experiment at LEP in e+e- collisions at centre-of-mass energies between 183 and 209 GeV, corresponding to an integrated luminosity of about 665 pb^{-1}. Results obtained in each of the final states q anti-q q anti-q, nu anti-nu q anti-q, mu+ mu- q anti-q, e+ e- q anti-q, tau+ tau- q anti-q, l+ l- l+ l-, and nu anti-nu l+ l- (with l=e,mu) are presented. [...]
hep-ex/0307050; CERN-EP-2003-009; CERN-EP-2003-009.- Geneva : CERN, 2003 - 35 p. - Published in : Eur. Phys. J. C 30 (2003) 447-466 Fulltext: 0307050 - PDF; arXiv:hep-ex_0307050 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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8.
(70)
Study of Triple-Gauge-Boson Couplings ZZZ, ZZ$\gamma$ and Z$\gamma\gamma$ at LEP / DELPHI Collaboration
Neutral triple-gauge-boson couplings ZZZ, ZZgam and Zgamgam have been studied with the DELPHI detector using data at energies between 183 and 208 GeV. Limits are derived on these couplings from an analysis of the reactions e+e- -> Zgam, using data from the final states gamma f fbar, with f = q or neutrino, from e+e- -> ZZ, using data from the four-fermion final states q qbar q qbar, q qbar mu+ mu-, q qbar e+ e-, q qbar nu nubar, mu+ mu- nu nubar and e+ e- nu nubar, and from e+e- -> Zgam*, in which the final state gamma is off mass-shell, using data from the four-fermion final states q qbar e+ e- and q qbar mu+ mu-. [...]
arXiv:0706.2741; HEP-PH-EP-2006-008; CERN-PH-EP-2006-008.- Geneva : CERN, 2007 - 29 p. - Published in : Eur. Phys. J. C 51 (2007) 525-542 Fulltext: PDF; External link: Fulltext
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9.
(70)
Measurement of the $W^{+}W^{-}\gamma$ Cross Section and Direct Limits on Anomalous Quartic Gauge Couplings at LEP / L3 Collaboration
The process e$^+$e$^-\rightarrow {\rm W}^+{\rm W}^-\gamma$ is analysed using the data collected with the L3 detector at LEP at a centre-of-mass energy of $188.6$ GeV, corresponding to an integrated luminosity of 176.8 pb$^{-1}$. Based on a sample of 42 selected ${\rm W}^+{\rm W}^-$ candidates containing an isolated hard photon, the ${\rm W}^+{\rm W}^-\gamma$ cross section, defined within phase-space cuts, is measured to be: $\sigma_{{\rm WW}\gamma} = 290 \pm 80 \pm 16$ fb, consistent with the Standard Model expectation [...]
hep-ex/0008022; CERN-EP-2000-097; CERN-EP-2000-097; CERN-L3-215.- Geneva : CERN, 2000 - 14 p. - Published in : Phys. Lett. B 490 (2000) 187-195 Fulltext: ep-2000-097 - PDF; arXiv:hep-ex_0008022 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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10.
(70)
Search for associated production of massive states decaying into two photons in $e^{+}e^{-}$ annihilations at $\sqrt{s}$ = 88 - 209 GeV / OPAL Collaboration
A search is performed for production of short-lived particles in e+e- -> XY, with X -> gamma gamma and Y -> ffbar, for scalar X and scalar or vector Y. Model-independent limits in the range of 25-60 femtobarns are presented on sigma (e+e- -> XY) x B(X -> ffbar) for centre-of-mass energies in the range 205-207 GeV. [...]
hep-ex/0207027; CERN-EP-2002-045; CERN-EP-2002-045.- Geneva : CERN, 2002 - 17 p. - Published in : Phys. Lett. B 544 (2002) 44-56 Fulltext: ep-2002-045 - PDF; arXiv:hep-ex_0207027 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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