3,283 research outputs found
On the position of a heavy Higgs pole
Higher loop calculations in the Higgs sector of the standard model at the
Higgs mass scale have shown that perturbation theory diverges very badly at
about 1 TeV in the on-shell renormalization scheme. The prediction of the
position of the Higgs pole in the complex s-plane becomes unreliable. We show
that in the pole renormalization scheme this appears to have much better
convergence properties, while showing good agreement with the on-shell scheme
over the validity range of the latter. This suggests that the pole scheme
should be preferable for phenomenological studies of heavy Higgs bosons. We
discuss whether this behaviour can be the result of a certain relation between
the on-shell mass and the pole mass at the nonperturbative level.Comment: replaced by the published version, 12 pages LaTex, 3 eps figures
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the role of shock waves in modulation of galactic cosmic rays
The understanding of modulation of the galactic cosmic rays has considerably progressed by the exploration by space probes of major heliospheric structures, such as the Corotating Interaction Regions, the neutral sheet, and the compression regions of intense heliospheric magnetic fields. Also relevant in this context were the detections in the outer heliosphere of long lasting Forbush type decreases of cosmic ray intensity. The results of recent theoretical studies on the changes in intensity and energy, at different location from the Sun, induced by the passage of shocks across the heliosphere are presented. In this version of the research, the simplest cases of modulation of uGV and 2GV particles by single or several shocks during periods of positive and negative solar field polarity are reviewed. The results of the theoretical aspects of the search is reported. The comparison of the theoretical predictions with space probe data allows conclusions to be drawn on the role of shocks on the modulation on both the 11 and 22 year galactic cosmic ray cycles in the outer heliosphere and on the plausibility of the models and parameters used
Chiral aspects of hadron structure
Chiral loop corrections for hadronic properties are considered in a
constituent quark model. It is emphasized that the correct implementation of
such corrections requires a sum over intermediate hadronic states. The leading
non-analytic corrections are very important for baryon magnetic moments and
explain the failure of the sum rule
predicted by the
constituent quark model.Comment: 10 pages, latex, 2 ps figures, to appear in Phys. Lett.
Slab Tipper
Stone countertops are very heavy and fragile. When installing a finished countertop, up to six workers are required to lift the stone onto the countertop, risking their safety and possibly breaking the stone. The safety of both the workers and the stone are very important, so there needs to be a better way. NSI Solutions came up with an idea for a mechanism to aid in the insulation process while limiting the number of workers required, and keeping the workers safer while adequately supporting the stone to prevent it from breaking. Designing methods and calculations were done to ensure the mechanism can support the stone while limiting the size and weight of the mechanism. During the construction process several changes were made to the design of the mechanism to make it easier to construct, limit cost, and increase the strength of the Slab Tipper. During the testing process, the mechanism will be evaluated and changes will be made to improve the Slab Tipper and ensure that it will work in the field. In the end the Mechanism will consist of two separate stands that can be stored in the installation truck when not in use. Then the stands can be set up next to the cabinets that the countertop will be installed on
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