156 research outputs found

    Head-tail Instability Caused by Electron Cloud

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    Regional display of the modern climate warming in tropo and strato spheres of the Northern Hemisphere

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    Preculiarities of spatial-temporal changes of the air temperatures and speed of the zonal wind from the earth surface up to isobar surface 10 gPa in the Northern Hemisphere for the period 1958-2003 are discussed. Main tendencies in their long term changes, testifying of heterogeneous temporal changes of areas of these amounts has been revealed by the methods of statistical analyses. © 2005 Yu. P. Perevedentsev, M. A. Vereshanig, E. P. Naumov, K. M. Shantalinskiy, A.A. Nikolaev

    Study of the process e+e-\to \mu+\mu- in the energy region \sqrt{s}=980, 1040 -- 1380 MeV

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    The cross section of the process e+e-\to\mu+\mu- was measured in the SND experiment at the VEPP-2M e+e- collider in the energy region \sqrt{s}=980, 1040 -- 1380 MeV. The event numbers of the process e+e-\to\mu+\mu- were normalized to the integrated luminosity measured using e+e-\to e+e- and e+e-\to\gamma\gamma processes. The ratio of the measured cross section to the theoretically predicted value is 1.006\pm 0.007 \pm 0.016 and 1.005 \pm 0.007 \pm 0.018 in the first and second case respectively. Using results of the measurements, the electromagnetic running coupling constant \alpha in the energy region \sqrt{s}=1040 -- 1380 MeV was obtained = 134.1\pm 0.5 \pm 1.2 and this is in agreement with theoretical expectation.Comment: 29 pages, 23 figure
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