Measurement of the Bottom-Strange Meson Mixing Phase in the Full CDF Data Set

We report a measurement of the bottom-strange meson mixing phase \beta_s using the time evolution of B0_s -> J/\psi (->\mu+\mu-) \phi (-> K+ K-) decays in which the quark-flavor content of the bottom-strange meson is identified at production. This measurement uses the full data set of proton-antiproton collisions at sqrt(s)= 1.96 TeV collected by the Collider Detector experiment at the Fermilab Tevatron, corresponding to 9.6 fb-1 of integrated luminosity. We report confidence regions in the two-dimensional space of \beta_s and the B0_s decay-width difference \Delta\Gamma_s, and measure \beta_s in [-\pi/2, -1.51] U [-0.06, 0.30] U [1.26, \pi/2] at the 68% confidence level, in agreement with the standard model expectation. Assuming the standard model value of \beta_s, we also determine \Delta\Gamma_s = 0.068 +- 0.026 (stat) +- 0.009 (syst) ps-1 and the mean B0_s lifetime, \tau_s = 1.528 +- 0.019 (stat) +- 0.009 (syst) ps, which are consistent and competitive with determinations by other experiments.Comment: 8 pages, 2 figures, Phys. Rev. Lett 109, 171802 (2012

The geology and geophysics of Kuiper Belt object (486958) Arrokoth

The Cold Classical Kuiper Belt, a class of small bodies in undisturbed orbits beyond Neptune, are primitive objects preserving information about Solar System formation. The New Horizons spacecraft flew past one of these objects, the 36 km long contact binary (486958) Arrokoth (2014 MU69), in January 2019. Images from the flyby show that Arrokoth has no detectable rings, and no satellites (larger than 180 meters diameter) within a radius of 8000 km, and has a lightly-cratered smooth surface with complex geological features, unlike those on previously visited Solar System bodies. The density of impact craters indicates the surface dates from the formation of the Solar System. The two lobes of the contact binary have closely aligned poles and equators, constraining their accretion mechanism

Long-Term Effects of the keepin� it REAL Model Program in Mexico: Substance Use Trajectories of Guadalajara Middle School Students

In the face of rising rates of substance use among Mexican youth and rapidly narrowing gender differences in use, substance use prevention is an increasingly urgent priority for Mexico. Prevention interventions have been implemented in Mexico but few have been rigorously evaluated for effectiveness. This article presents the long term effects of a Mexico-based pilot study to test the feasibility of a linguistically specific (Mexican Spanish) adapted version of keepin� it REAL, a school-based substance abuse prevention model program. University affiliated researchers from Mexico and the US collaborated on the study design, program implementation, data collection, and analysis. Students and their teachers from two middle schools (secundarias) in Guadalajara participated in this field trial of Mantente REAL (translated to Spanish). The schools were randomly assigned to treatment and control conditions. The sample of 431 students reported last 30�day substance use at three times (one pretest and two posttests). Changes in substance use behaviors over time were examined using growth curve models. Long term desired intervention effects were found for alcohol and marijuana use but not for cigarettes. The intervention effects were greater for girls than for boys in slowing the typical developmental increase over time in alcohol use. Marijuana effects were based on small numbers of users and indicate a need for larger scale studies. These findings suggest that keepin� it REAL is a promising foundation for cultural program adaptation efforts to create efficacious school-based universal prevention interventions for middle school students in Mexico. � 2014, Springer Science+Business Media New York

Findings from a UK feasibility study of the Centering Pregnancy® model

CenteringPregnancy® is a model of group antenatal care which was devised and developed in the United States. A feasibility study was conducted in South East London from 2008 to 2010, to assess if the model could be introduced into NHS settings, if women would be prepared to join a group model of care and to explore the views of the women, their partners and midwives who participated. This was the first time the model had been implemented in the UK. Six antenatal groups, attended by 60 women and their partners and facilitated by 12 midwives, were established for the feasibility study with a seventh group of 8 women and their partners established later to bring the learning together and inform an operational guidance document ( Gaudion and Menka, 2011 ). Women whose pregnancies were classed as low or high risk could opt for group antenatal care at the study site after discussion with a midwife at their antenatal booking visit. Integral components of the CenteringPregnancy model are the evaluations of care which women and their partners are asked to provide in late pregnancy and at one month after the birth of their baby. The midwives who facilitate the groups are also required to complete evaluation forms and to contemporaneously reflect and enhance the care they offer, if this is appropriate. Feedback from these sources, together with an evaluation of the means of learning in the development process, was very positive and has informed the ongoing roll-out of the model at the study site. The potential to conduct randomized controlled trials in the UK to assess the clinical utility and cost-effectiveness of group antenatal care compared with individual antenatal care for women in low- and high-risk obstetric populations should now be considered. </jats:p

Improved estimators for the selected location parameters

Subset selection, exponential populations, simultaneous estimation after selection, natural estimator, the unbiased estimator, improved estimators, Primary 62F10, secondary 62F07, 62C14,