10,035 research outputs found
Up Sector of Minimal Flavor Violation: Top Quark Properties and Direct D meson CP violation
Minimal Flavor Violation in the up-type quark sector leads to particularly
interesting phenomenology due to the interplay of flavor physics in the charm
sector and collider physics from flavor changing processes in the top sector.
We study the most general operators that can affect top quark properties and
meson decays in this scenario, concentrating on two CP violating operators
for detailed studies. The consequences of these effective operators on charm
and top flavor changing processes are generically small, but can be enhanced if
there exists a light flavor mediator that is a Standard Model gauge singlet
scalar and transforms under the flavor symmetry group. This flavor mediator can
satisfy the current experimental bounds with a mass as low as tens of GeV and
explain observed -meson direct CP violation. Additionally, the model
predicts a non-trivial branching fraction for a top quark decay that would
mimic a dijet resonance.Comment: 27 pages, 7 figure
Sources of cross-sectional variations in stock returns and risk: an empirical analysis of emerging markets
It is well established in the financial economics literature that potential gains from
international diversification are generated from the imperfect correlation between
national stock market returns. This empirical study explores the factors that impede
perfect integration among national equity markets by examining emerging markets
data.
The first major topic of the dissertation is to re-visit the debate on the relative
importance of country and industry effects in the cross-sectional variation of stock
returns. By applying the standard Heston and Rouwenhorst (1994) dummy variable
decomposition method to $U. S. nominal returns from 11 industry sectors of 13
emerging markets from 1984 to 2004, this work confirms that country effects do play
a dominant role in determining the cross-sectional variation in stock returns in
emerging markets but since late 1990s, the industry effects have become increasingly
important. This conclusion is robust even after the removal of three potential biases:
inflation rate, exchange rate and interest rate effects, all of which may amplify the
country effects.
The second topic is to investigate the debate from the perspective of stock risk. Stock
risk is modeled and calculated independently from a return model with ARCH type
errors. By applying the standard dummy variable decomposition method to stock risks,
the empirical evidence is found to support the conclusions drawn on stock return
decompositions.
Finally, in order to find the fundamental sources of the country and industry factors,
pure country and industry effects are then regressed on fundamental characteristics of
country and industry. The findings show that the change in the variables representing
the exchange rate can explain a substantial amount of the country effect variations,
while at the same time, banking and stock markets development also contribute to the
variations. The regressions also find evidence that the legal origin of the market does
matter to stock returns. Regressions on industry effects are not as promising as the
results of the country effects regression. Only the geographical concentration of
industries is found to explain a small amount of the industry effects
The Relationship of Teachers’ Perception Towards Organizational Climate and Their Retention in Guiyang Qingzhen Boya International Experimental School, Guizhou Province, China
The main purpose of this study was to determine the relationship of teachers' perception towards organizational climate and their retention in Guiyang Qingzhen Boya International Experimental School, Guizhou Province, China. The research surveyed a total of 80 full-time teachers in Guiyang Qingzhen Boya International Experimental School. The researcher used Mean and Standard Deviation to analysis the teachers’ perceptions toward the level of organizational climate and their retention. Pearson Product Moment Coefficient of Correlation was used to test the relationship between the two variables. The result of this study showed that teachers in the school perceived a high level of organizational climate and their perception towards their retention. Pearson correlation tested that there was a relationship between teachers’ perception towards organizational climate and their retention
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