Charmless B(s)→VVB_{(s)}\to VV Decays in Factorization-Assisted Topological-Amplitude Approach

Within the factorization-assisted topological-amplitude approach, we studied the 33 charmless $B_{(s)} \to VV$ decays, where $V$ stands for a light vector meson. According to the flavor flows, the amplitude of each process can be decomposed into 8 different topologies. In contrast to the conventional flavor diagrammatic approach, we further factorize each topological amplitude into decay constant, form factors and unknown universal parameters. By $\chi^2$ fitting 46 experimental observables, we extracted 10 theoretical parameters with $\chi^2$ per degree of freedom around 2. Using the fitted parameters, we calculated the branching fractions, polarization fractions, CP asymmetries and relative phases between polarization amplitudes of each decay mode. The decay channels dominated by tree diagram have large branching fractions and large longitudinal polarization fraction. The branching fractions and longitudinal polarization fractions of color-suppressed decays become smaller. Current experimental data of large transverse polarization fractions in the penguin dominant decay channels can be explained by only one transverse amplitude of penguin annihilation diagram. Our predictions of those not yet measured channels can be tested in the ongoing LHCb experiment and the Belle-II experiment in future.Comment: 22 pages, 2 figure

Health Information Systems Implementation: A Beforeand- After Observational Study

While technical challenges persist in health information systems, many of these implementations fail because oforganizational issues. A major criticism of health information systems, which include electronic health records (EHR) andcomputerized physician order entry (CPOE), is that their underlying model is too simplistic and does not reflect thecomplexity and fluidity of healthcare practice. This has led to systems that cannot adequately support the dynamic andcontingent nature of clinical work or facilitate communication and collaboration among clinicians. Studies of unexpectedconsequences of EHR implementations reveal social and political impacts, and that many contextual factors are not wellunderstood or their importance underemphasized. Using a before-and-after observational study design and adopting thesociotechnical systems perspective, this study analyzes impacts of an EHR on clinician workflow, time allocation andcommunication, and provides useful insight into how such systems affect user work activities, thereby informing futurehealth information system adoptions and implementations