4,747 research outputs found
Non-spectator Contributions To The Lifetime of
In this work, we evaluate the contributions of non-spectator effects to the
lifetimes of and B-mesons. Based on the well-established models and
within a reasonable range of the concerned parameters, the contributions can
reduce the lifetime of by compared to that of B-mesons
which are not significantly affected. This might partly explain the measured
ratio \cite{Data}, which has been a
long-standing discrepancy between theory and experimental data
Non-Borrowing Students’ Perceptions of Student Loans and Strategies of Paying for College
With the notable shift from grants to loans over the past several decades, many researchers have argued the positive impact of financial aid on student college choice, enrollment, and persistence. However, literature indicates that students from economically disadvantaged backgrounds are less likely to take loans to finance postsecondary education than those from affluent conditions. Qualitative research on the reasons for non-borrowers’ aversion to loans and strategies for college payment is rather scant. This study explores 30 lower- or lower-middle-class non-borrowing students’ lived experiences surrounding student loans from a qualitative phenomenological research lens. Data are collected from semi-structured interviews. Data analysis shows four main reasons that the participants generally avoid borrowing as they decide where to attend and how to pay for college: parental influence, fear of economic burden, underestimation of the value of college education, and lack of information about the loan system. The strategies they employ for college payment include scholarships and grants, family support, part-time jobs, and prepaid college tuition programs. This study uses peer debriefing to ensure its trustworthiness. Limitations of this study and implications for future research and practice are discussed
Reducing the Tension Between the BICEP2 and the Planck Measurements: A Complete Exploration of the Parameter Space
A large inflationary tensor-to-scalar ratio is reported by the BICEP2 team based on their B-mode
polarization detection, which is outside of the confidence level of the
Planck best fit model. We explore several possible ways to reduce the tension
between the two by considering a model in which ,
, and the neutrino parameters and
are set as free parameters. Using the Markov Chain
Monte Carlo (MCMC) technique to survey the complete parameter space with and
without the BICEP2 data, we find that the resulting constraints on
are consistent with each other and the apparent tension
seems to be relaxed. Further detailed investigations on those fittings suggest
that probably plays the most important role in reducing the
tension. We also find that the results obtained from fitting without adopting
the consistency relation do not deviate much from the consistency relation.
With available Planck, WMAP, BICEP2 and BAO datasets all together, we obtain
, ,
, and
; if the consistency relation is
adopted, we get .Comment: 8 pages, 4 figures, submitted to PL
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