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[en] The analysis of data from CLAS is a multi-step process. After the detectors for a given running period have been calibrated, the data is processed in the so called pass-1 cooking. During the pass-1 cooking each event is reconstructed by the program a1c which finds particle tracks and computes momenta from the raw data. The results are then passed on to several data monitoring and filtering utilities. In CLAS software, a filter is a parameterless function which returns an integer indicating whether an event should be kept by that filter or not. There is a main filter program called g1-filter which controls several specific filters and outputs several files, one for each filter. These files may then be analyzed separately, allowing individuals interested in one reaction channel to work from smaller files than using the whole data set would require. There are several constraints on what the filter functions should do. Obviously, the filtered files should be as small as possible, however the filter should also not reject any events that might be used in the later analysis for which the filter was intended
[en] We investigate deviation from the tribimaximal mixing in the case of ultrahigh energy neutrino using the ICECUBE detector. We consider the ratio of the number of muon tracks to the shower generated due to eletrons and hadrons. Our analysis shows that for tribimaximal mixing the ratio comes out around 4.05. Keeping θ12 and θ23 fixed at tribimaximal value, we have varied the angle θ13=3 deg. , 6 deg. , 9 deg. and the value of the ratio gradually decreases. The variation of ratio lies within 8% to 18% from the tribimaximal mixing value and it is very difficult to detect such a small variation by the ICECUBE detector
[en] A search for Q-balls has been carried out in Super-Kamiokande II with 541.7 days of live time. A neutral Q-ball passing through the detector can interact with nuclei to produce pions, generating a signal of successive contained pion events along a track. No candidate for successive contained event groups has been found in Super-Kamiokande II, so we obtain upper limits on the flux of such Q-balls
[en] We show that the structure constants of k-Lie algebras, k > 3, with a positive definite metric are the sum of the volume forms of orthogonal k-planes. This generalizes the result for k = 3 in Papadopoulos (2008 Preprint arXiv:0804.2662) and Gauntlett and Gutowski (2008 Preprint arXiv:0804.3078), and confirms a conjecture in Figueroa-O'Farrill and Papadopoulos (2002 Preprint math/0211170). (fast track communication)
[en] Highlights: • Extends constraint for particle conservation to recent Linear Source (LS) MOC. • LS MOC anisotropic sources with spatially-linear zeroth-order angular moments. • Isotropic source with direction-independent quantities respects particle balance. • Anisotropic sources with direction-dependent quantities respects particle balance. • Numerical results verify particle conservation for isotropic and anisotropic sources. - Abstract: Particle conservation, otherwise known as particle balance, is one of the main properties to examine when considering any transport discretization. In the past, particle conservation has been examined for the ‘Flat Source’ (FS) approximation used in the Method of Characteristics (MOC) for isotropic and anisotropic sources. The work presented here extends one of the necessary constraints for particle conservation to the recent ‘Linear Source’ (LS) approximation in the MOC for isotropic and anisotropic sources. As a result, direction-dependent track renormalization and centroids are examined. A new LS MOC set of equations is derived for problems involving anisotropic sources in which the zeroth-order angular moment of the source possesses spatially-linear expansion coefficients and satisfies particle conservation if direction-dependent track renormalization and centroids are employed. Numerical results are presented which verify that the FS and LS MOC satisfy particle conservation for problems involving isotropic and anisotropic sources by considering a simple pin cell test problem. In addition, results from a set of full-core eigenvalue calculations, which make use of the anisotropic source option, are presented and compared to evaluate the impact of using either direction dependent or direction independent track renormalization (and centroids).