Dust vortices with a void at the centre are reported in this paper. The role of the spatial variation of the plasma potential in the rotation of dust particles is studied in a parallel plate glow discharge plasma. Probe measurements reveal the existence of a local potential minimum in the region of formation of the dust vortex. The minimum in the potential well attracts positively charged ions, while it repels the negatively charged dust particles. Dust rotation is caused by the interplay of the two oppositely directed ion drag and Coulomb forces. The balance between these two forces is found to play a major role in the radial confinement of the dust particles above the cathode surface. Evolution of the dust vortex is studied by increasing the discharge current from 15 to 20 mA. The local minimum of the potential profile is found to coincide with the location of the dust vortex for both values of discharge currents. Additionally, it is found that the size of the dust vortex as well as the void at the centre increases with the discharge current.

Dust vortices in a direct current glow discharge plasma: a delicate balance between ion drag and Coulomb force

Glueballs, Hybrids, Multiquarks. Experimental facts versus QCD inspired concepts

The KLOE detector is operational since spring '99 at DA?NE, the Frascati e+e- collider, a -factory running at 1.02 GeV c.m. energy. This detector has been designed and built with the primary goal of measuring Re(?' / ?), the CP violation parameter in the kaon system, with a sensitivity of about one part in ten thousands. Apart from CP studies in the kaon system, KLOE has a rich scientific program that can be exploited with an integrated luminosity not far from the one which has already been collected, namely the study of decays into scalar and pseudoscalar mesons, the measurement of the hadronic cross-section up to 1 GeV, rare kaon decays, decays into three pions. Since the detector installation there have been three periods of stable data taking and a total amount of ~200 pb-1 has been collected by end of 2001, corresponding to ~6.7 ? 108 mesons and to ~8.7 ? 106 ? mesons, being BR( ? ??) = (1.297?0.033) ? 10-2. We present the results obtained, for a data sample of 17 pb-1 collected in the year 2000, for ? ?? and ? ?'?: the ratio of these two BR's has been measured to be (5.3 ? 0.5 ? 0.4) ? 10-3, leading to a very accurate determination of the mixing angle in the flavor basis P = (40+7.5-1.5)? and to the most accurate determination of BR( ? ?'?) to date; (6.8 ? 0.6 ? 0.5) ? 10-5. From the ratio BR( ? ?'?)/BR( ? ?0?) we have extracted the value BR( ? ?0?) = (1.377 ? 0.007 ? 0.05) ? 10-3.

http://iopscience.iop.org/article/10.1238/Physica.Topical.099a00123/pdf

η, η' Studies with the KLOE Detector at DAΦNE

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η, η' Studies with the KLOE Detector at DAΦNE