17 research outputs found
Constraints on SUSY Gluonic Dipole Interaction from B\to K\pi Decays
In low energy SUSY theories exchange of gluino and squark with left-right
mixing can produce a large gluonic dipole interaction. In this paper we study
the effects of this interaction on using QCD improved
factorization method. The Standard Model predicts a smaller branching ratio for
than experimental measured one. We find that within
the parameter space allowed from constraint, the SUSY dipole
interaction can enhance this branching ratio to agree with the experimental
measurement. Combining recent data for all the four and decay modes, we find
that the allowed parameter space is reduced significantly compared with that
using data alone. It is found that even with these
constraints, the predictions for CP violation in these modes can be
dramatically different from those of the SM predictions.Comment: 22 pages, 22 figures. Major revise for B to K pi correctio
The role of the dentate gyrus and adult neurogenesis in hippocampal-basal ganglia associated behaviour
The ability of the brain to continually generate new neurons throughout life is one of the most intensely researched areas of modern neuroscience. While great advancements in understanding the biochemical mechanisms of adult neurogenesis have been made, there remain significant obstacles and gaps in connecting neurogenesis with behavioural and cognitive processes such as learning and memory. The purpose of the thesis was to examine by review and laboratory experimentation the role of the dentate gyrus and of adult neurogenesis within the hippocampus in the performance of cognitive tasks dependent on the hippocampal formation and hippocampal-basal ganglia interactions. Advancement in understanding the role of neurogenesis in these processes may assist in improving treatments for common brain injury and cognitive diseases that affect this region of the brain.
Mild chronic stress reduced the acquisition rate of a stimulus-response task (p=0.043), but facilitated the acquisition of a discrimination between a small and a large reward (p=0.027). In locomotor activity assays, chronic stress did not shift the dose-response to methamphetamine. Analysis of 2,5-bromodeoxyuridine incorporation showed that, overall, chronic mild stress did not effect survival of neuronal progenitors . However, learning of the tasks had a positive influence on cell survival in stressed animals (p=0.038). Microinjections of colchicine produced significant lesions of the dentate gyrus and surrounding CA1-CA3 and neocortex. Damage to these regions impaired hippocampal-dependent reference memory (p=0.054) while preserving hippocampal independent simple discrimination learning. In a delay discounting procedure, the lesions did not induce impulsive-like behaviour when delay associated with a large reward was introduced. The experiments uphold a current theory that learning acts as a buffer to mitigate the negative effects of stress on neurogenesis
Time-frequency analysis of multichannel signals using two-sided autoregressive modeling
SCOPUS: ar.jinfo:eu-repo/semantics/publishe