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CERN Document Server 100 records found  1 - 10próximoend  jump to record: Search took 1.06 seconds. 
1.
The second data release from the European Pulsar Timing Array - IV. Implications for massive black holes, dark matter, and the early Universe / EPTA Collaboration
The European Pulsar Timing Array (EPTA) and Indian Pulsar Timing Array (InPTA) collaborations have measured a low-frequency common signal in the combination of their second and first data releases respectively, with the correlation properties of a gravitational wave background (GWB). Such signal may have its origin in a number of physical processes including a cosmic population of inspiralling supermassive black hole binaries (SMBHBs); inflation, phase transitions, cosmic strings and tensor mode generation by non-linear evolution of scalar perturbations in the early Universe; oscillations of the Galactic potential in the presence of ultra-light dark matter (ULDM). [...]
arXiv:2306.16227.- 2024-05-01 - 30 p. - Published in : Astron. Astrophys. 685 (2024) A94 Fulltext: document - PDF; 2306.16227 - PDF;
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2.
The International Pulsar Timing Array second data release: Search for an isotropic Gravitational Wave Background / Antoniadis, J. (FORTH, Heraklion ; Bonn, Max Planck Inst., Radioastron. ; Argelander Inst. Astron.) ; Arzoumanian, Z. (NASA, Goddard) ; Babak, S. (APC, Paris) ; Bailes, M. (Swinburne U. Tech., Hawthorn ; ARC, CoEPP, Australia) ; Nielsen, A.-S. Bak (Bonn, Max Planck Inst., Radioastron. ; Bielefeld U.) ; Baker, P.T. (Widener U.) ; Bassa, C.G. (ASTRON, Dwingeloo) ; Becsy, B. (Montana State U.) ; Berthereau, A. (LPC2E, Orleans ; Station Radioastronomy, Nancay) ; Bonetti, M. (Milan Bicocca U. ; INFN, Milan Bicocca) et al.
We searched for an isotropic stochastic gravitational wave background in the second data release of the International Pulsar Timing Array, a global collaboration synthesizing decadal-length pulsar-timing campaigns in North America, Europe, and Australia. In our reference search for a power law strain spectrum of the form $h_c = A(f/1\,\mathrm{yr}^{-1})^{\alpha}$, we found strong evidence for a spectrally-similar low-frequency stochastic process of amplitude $A = 3.8^{+6.3}_{-2.5}\times10^{-15}$ and spectral index $\alpha = -0.5 \pm 0.5$, where the uncertainties represent 95% credible regions, using information from the auto- and cross-correlation terms between the pulsars in the array. [...]
arXiv:2201.03980.- 2022-01-27 - 15 p. - Published in : Mon. Not. R. Astron. Soc. 510 (2022) 4873 Fulltext: PDF;
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3.
Untersuchungen zur Verknüpfung von Konstanten der Atomhülle / Schönfeld, Eckart
PTB-Ra-37 - Braunschweig : Physikalisch-Technische Bundesantalt, 1995. - 88 p.

Full text
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4.
Recycling MHC class I molecules and endosomal peptide loading / Gromme, M ; Uytdehaag, F G ; Janssen, H ; Calafat, J
1999
In : 10th Annual Symposium on Frontiers of Science, Irvine, CA, USA, 19 - 21 Nov 1998, pp.10326-10331
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5.
A Direct determination of the number of light neutrino families from $e^+ e^- \to$ neutrino antineutrino $\gamma$ at LEP / L3 Collaboration
CERN-L3-035.- Geneva : CERN, 1992 - Published in : Phys. Lett. B 275 (1992) 209-221
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6.
Study of hadronic events and measurements of $\alpha_{s}$ between 30 and 91 GeV / L3 Collaboration
We have studied the structure of hadronic events with a hard, %radiated isolated photon in the final state ($\mathrm{e^{+}e^{-}} \rightarrow$ Z $\rightarrow$ hadrons $+$ $\gamma$) in the 3.6 million hadronic data collected with the L3 detector at centre-of-mass energies around 91 GeV. The centre-of-mass energy of the hadronic system is in the range 30 GeV to 86 GeV [...]
CERN-PPE-97-074; CERN-L3-122.- Geneva : CERN, 1997 - 20 p. - Published in : Phys. Lett. B 411 (1997) 339-353 Fulltext: PDF; - Please contact the library if you need to access this document.
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7.
Resonance formation in the $\pi^+\pi^-\pi^0$ final state in two-photon collisions / L3 Collaboration
A study of resonance formation is presented in the $\pi^+\pi^-\pi^0$ final state in two-photon collisions at LEP. The $a_2(1320)$ radiative width is measured to be $\Gamma_{\gamma\gamma}=0.98\pm0.05\pm0.09$ keV{}. [...]
CERN-PPE-97-068; CERN-L3-121.- Geneva : CERN, 1997 - 19 p. - Published in : Phys. Lett. B 413 (1997) 147-158 Fulltext: PDF; - Please contact the library if you need to access this document.
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8.
$K^{0}_{S}$ and $\Lambda$ production in quark and gluon jets at LEP / L3 Collaboration
A measurement of the $\mathrm{K^0_s}$ and $\Lambda$ inclusive production rates and momentum spectra in two- and three-jet events is presented. On the basis of about 3.1~million Z decays collected with the L3 detector at LEP, we observe that the production of these particles is well modeled by string fragmentation..
CERN-PPE-97-050; CERN-L3-118.- Geneva : CERN, 1997 - 19 p. - Published in : Phys. Lett. B 407 (1997) 389-401 Fulltext: PDF; - Please contact the library if you need to access this document.
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9.
Inclusive J, $\psi$' and $\chi_c$ Production in Hadronic Z Decays / L3 Collaboration
\mathrm{ Br(Z \rightarrow \chi_{c2} + X) < 3.2\,\times\,10^{-3}}..
CERN-PPE-97-044; CERN-L3-114.- Geneva : CERN, 1997 - 17 p. - Published in : Phys. Lett. B 407 (1997) 351-360 Fulltext: PDF; - Please contact the library if you need to access this document.
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10.
Production of e, $\mu$ and $\tau$ Pairs in Untagged Two-Photon Collisions at LEP / L3 Collaboration
The two-photon collision reaction e+e- --> e+e-l+l- has been studied at root(s) ~ 91 GeV using the L3 detector at LEP for l = e, muon , tau. We have analysed untagged configurations where the two photons are quasi-real. [...]
CERN-PPE-97-043; CERN-L3-113.- Geneva : CERN, 1997 - 18 p. - Published in : Phys. Lett. B 407 (1997) 341-350 Fulltext: PDF; - Please contact the library if you need to access this document.
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Veja também: nomes de autores similares
44 Janssen, H K
5 Janssen, Hans-Karl
1 Janssen, Herbert
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