5,400 research outputs found
Recent measurements of CP violation at the B factories
Recent measurements of time dependent CP asymmetries at the B factories have
led to substantial progress in our understanding of CP violation. In this
article, I review some of these experimental results and discuss their
implications in the Standard Model and their sensitivity to New Physics.Comment: 17 pages, 13 figures, to be published in Modern Physics Letters A. To
be published in Modern Physics Letters
Dynamical transitions and quantum quenches in mean-field models
We develop a generic method to compute the dynamics induced by quenches in
completely connected quantum systems. These models are expected to provide a
mean-field description at least of the short time dynamics of finite
dimensional system. We apply our method to the Bose-Hubbard model, to a
generalized Jaynes-Cummings model, and to the Ising model in a transverse
field. We find that the quantum evolution can be mapped onto a classical
effective dynamics, which involves only a few intensive observables. For some
special parameters of the quench, peculiar dynamical transitions occur. They
result from singularities of the classical effective dynamics and are
reminiscent of the transition recently found in the fermionic Hubbard model.
Finally, we discuss the generality of our results and possible extensions
Physics results from BABAR and prospects
The BABAR experiment has been taking data since about one year. Physics
results, complementary to those described by G.Sciolla elsewhere in these
Proceedings, are presented: various measurements of the neutral and charged B
mesons lifetimes, the B^0 mixing frequency, the mistag fractions, and the B -->
D_s^(*) X and B^0 --> D_s^(*)+ D^* branching ratios. Some prospects for the
close future are shown. All the numbers given here are preliminary.Comment: 12 pages, 12 postscript figures, contributed proceedings of the
International Conference On CP Violation Physics, 9/18-22/2000, Ferrara,
Ital
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Adverse Childhood Experiences in Medical Students: Implications for Wellness.
ObjectiveThe primary purpose of the study was to assess the prevalence of adverse childhood experiences (ACEs) in a cohort of third-year medical students and characterize their childhood protective factors.MethodsThe authors developed a web-based anonymous survey distributed to all third-year medical students in one school (N = 98). The survey included the 10-item ACE Study questionnaire, a list of childhood protective factors (CPF) and questions to assess students' perception of the impact of ACEs on their physical and mental health. The medical school's IRB approved the student survey as an exempt study. The authors computed descriptive and comparative statistical analyses.ResultsEighty-six of 98 students responded (88% response rate). Forty-four students (51%) reported at least one ACE exposure and 10 (12%) reported ≥ 4 exposures. The latter were all female. The average difference in the ACE score between male and female medical students was - 1.1 (independent t test with unequal variances t(57.7) = - 2.82, P = .007). Students with an ACE score of ≥ 4 were significantly more likely to report a moderate or significant effect on their mental health, compared with students with scores ≤ 3 (chi-square test, P = < .0001). Most students reported high levels of CPF (median score = 13 of a maximum score = 14). ACEs and CPF were inversely associated (Pearson correlation = - 0.32, P = .003).ConclusionsA sizeable minority of medical students reported exposure to multiple ACEs. If replicated, findings suggest a significant vulnerability of these medical students to health risk behaviors and physical and mental health problems during training and future medical practice
Directional detection of Dark Matter
Among the many experimental techniques available, those providing directional
information have the potential of yielding an unambiguous observation of WIMPs
even in the presence of insidious backgrounds. A measurement of the
distribution of arrival direction of WIMPs can also discriminate between
Galactic Dark Matter halo models. In this article, I will discuss the
motivation for directional detectors and review the experimental techniques
used by the various experiments. I will then describe one of them, the DMTPC
detector, in more detail.Comment: 17 pages, 11 postscript figures, mini-review submitted to Modern
Physics Letters A (MPLA). Submitted to Modern Physics Letters A (MPLA
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