Erik Kramer | College of the Redwoods (original) (raw)

Papers by Erik Kramer

Supersymmetric models with a high supersymmetry breaking scale give, in general, large contributi... more Supersymmetric models with a high supersymmetry breaking scale give, in general, large contributions to epsilon_K and/or to various electric dipole moments, even when contributions to CP conserving, flavor changing processes are sufficiently suppressed. Some examples are models of dilaton dominance, alignment, non-Abelian flavor symmetries, heavy first two generation sfermions, anomaly mediation and gaugino mediation. There is then strong motivation for `approximate CP', that is a situation where all CP violating phases are small. In contrast, in supersymmetric models with a low breaking scale it is quite plausible that the CKM matrix is the only source of flavor and CP violation. Gauge mediation provides a concrete example. Approximate CP is then unacceptable. Upcoming measurements of the CP asymmetry in B to \psi K_S might exclude or support the idea of approximate CP and consequently probe the scale of supersymmetry breaking.

A new geomembrane product, Leak Location Liner, developed by GSE specifically for electrical line... more A new geomembrane product, Leak Location Liner, developed by GSE specifically for electrical liner integrity surveys (ELIS), enables leak detection surveys for otherwise unfeasible applications and improves leak detection sensitivity for common applications. The capability of this new geomembrane to enable leak detection surveys on the primary liner of a double-lined installation, sites with complete subgrade desiccation, holes at the peak of a wrinkle, under a seam flap, and in an area of poor contact with the subgrade were all tested and verified. In order to compare the leak detection sensitivity of a survey performed on Leak Location Liner to a survey performed on traditional geomembrane, comparative bench-scale testing on both was conducted. The ratio of a leak signal obtained on the Leak Location Liner setup relative to a leak signal obtained on the traditional geomembrane setup was calculated and is here-on referred to as the improvement factor for ease in interpreting the co...

Various ideas support the notion that the GUT gauge group might be a semi-simple dual group such ... more Various ideas support the notion that the GUT gauge group might be a semi-simple dual group such as SU(5) x SU(5). The doublet-triplet splitting problem can be solved through the use of a direct product gauge group. It is shown as well that requiring that the GUT scale is not fixed by model parameters rules out a single SU(5) gauge

Physical Review D, 2001

Supersymmetric models with a high supersymmetry breaking scale give, in general, large contributi... more Supersymmetric models with a high supersymmetry breaking scale give, in general, large contributions to ε K and/or to various electric dipole moments, even when contributions to CP conserving, flavor changing processes are sufficiently suppressed. Some examples are models of dilaton dominance, alignment, non-Abelian flavor symmetries, heavy first two generation sfermions, anomaly mediation and gaugino mediation. There is then strong motivation for 'approximate CP', that is a situation where all CP violating phases are small. In contrast, in supersymmetric models with a low breaking scale it is quite plausible that the CKM matrix is the only source of flavor and CP violation. Gauge mediation provides a concrete example. Approximate CP is then unacceptable. Upcoming measurements of the CP asymmetry in B → ψK S might exclude or support the idea of approximate CP and consequently probe the scale of supersymmetry breaking.

Various ideas support the notion that the GUT gauge group might be a semi-simple direct-product g... more Various ideas support the notion that the GUT gauge group might be a semi-simple direct-product group such as SU(5)timesSU(5)SU(5) \times SU(5)SU(5)timesSU(5). The doublet-triplet splitting problem can be solved with a direct product group. String theory suggests that the GUT scale is a modulus. Requiring this rules out a single SU(5) gauge group. A model with SU(5)timesSU(5)SU(5) \times SU(5)SU(5)timesSU(5) gauge symmetry

Physical Review D, 2001

Supersymmetric models with a high supersymmetry breaking scale give, in general, large contributi... more Supersymmetric models with a high supersymmetry breaking scale give, in general, large contributions to ε K and/or to various electric dipole moments, even when contributions to CP conserving, flavor changing processes are sufficiently suppressed. Some examples are models of dilaton dominance, alignment, non-Abelian flavor symmetries, heavy first two generation sfermions, anomaly mediation and gaugino mediation. There is then strong motivation for 'approximate CP', that is a situation where all CP violating phases are small. In contrast, in supersymmetric models with a low breaking scale it is quite plausible that the CKM matrix is the only source of flavor and CP violation. Gauge mediation provides a concrete example. Approximate CP is then unacceptable. Upcoming measurements of the CP asymmetry in B → ψK S might exclude or support the idea of approximate CP and consequently probe the scale of supersymmetry breaking.