5,560 research outputs found
Slepton Non-Universality in the Flavor-Effective MSSM
Supersymmetric theories supplemented by an underlying flavor-symmetry
provide a rich playground for model building aimed at
explaining the flavor structure of the Standard Model. In the case where
supersymmetry breaking is mediated by gravity, the soft-breaking Lagrangian
typically exhibits large tree-level flavor violating effects, even if it stems
from an ultraviolet flavor-conserving origin. Building on previous work, we
continue our phenomenological analysis of these models with a particular
emphasis on leptonic flavor observables. We consider three representative
models which aim to explain the flavor structure of the lepton sector, with
symmetry groups , and .Comment: References added, minor typos corrected. 28 pages, 8 figure
The silicon stable isotope distribution along the GEOVIDE section (GEOTRACES GA-01) of the North Atlantic Ocean
The stable isotope composition of dissolved silicon in seawater (ÎŽ30SiDSi) was examined at 10 stations along the GEOVIDE section (GEOTRACES GA-01), spanning the North Atlantic Ocean (40â60ââN) and Labrador Sea. Variations in ÎŽ30SiDSi below 500âm were closely tied to the distribution of water masses. Higher ÎŽ30SiDSi values are associated with intermediate and deep water masses of northern Atlantic or Arctic Ocean origin, whilst lower ÎŽ30SiDSi values are associated with DSi-rich waters sourced ultimately from the Southern Ocean. Correspondingly, the lowest ÎŽ30SiDSi values were observed in the deep and abyssal eastern North Atlantic, where dense southern-sourced waters dominate. The extent to which the spreading of water masses influences the ÎŽ30SiDSi distribution is marked clearly by Labrador Sea Water (LSW), whose high ÎŽ30SiDSi signature is visible not only within its region of formation within the Labrador and Irminger seas, but also throughout the mid-depth western and eastern North Atlantic Ocean. Both ÎŽ30SiDSi and hydrographic parameters document the circulation of LSW into the eastern North Atlantic, where it overlies southern-sourced Lower Deep Water. The GEOVIDE ÎŽ30SiDSi distribution thus provides a clear view of the direct interaction between subpolar/polar water masses of northern and southern origin, and allow examination of the extent to which these far-field signals influence the local ÎŽ30SiDSi distribution
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