4 research outputs found

    The Physics of the B Factories

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    Characterization of cutaneous cell carcinomas by ultrasound biomicroscopy

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    AbstractThe potential of ultrasound biomicroscopy (UBM) images to evidence the alterations occurring in skin tissues affected by cutaneous carcinomas was studied. The histological patterns associated to these carcinomas can vary considerably between patients, involving diverse atypical tissue constituents which should be identified in UBM images, considering the perspective of applying this technique as a diagnostic tool. The study was conducted using in vitro fresh human tissue samples, obtained from biopsied volunteer patients. The UBM images were generated as in the conventional B-mode, and acquired with an experimental system working in a fundamental frequency of 45 MHz. Distinct tissues constituents, normal or pathologic, were identified in the UBM images by variations in the image brightness level, and could be observed in most of the studied cases. Moreover, the brightness characteristics associated to each tissue constituent seem to repeat along the different studied samples. Although the differentiation between the diverse structures was possible by a qualitative analysis, additional quantitative techniques (related to tissue acoustic, statistical and spectral properties) are been implemented, to improve the UBM diagnostic capability

    Measurements of branching fractions, polarizations, and direct CP-violation asymmetries in B^{+}→ρ^{0}K^{*+} and B^{+}→f_{0}(980)K^{*+} decays

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    We present measurements of the branching fractions, longitudinal polarization, and direct CP-violation asymmetries for the decays B+→ρ0K*+ and B+→f0(980)K*+ with a sample of (467±5)×106BB̅ pairs collected with the BABAR detector at the PEP-II asymmetric-energy e+e- collider at the SLAC National Accelerator Laboratory. We observe B+→ρ0K*+ with a significance of 5.3σ and measure the branching fraction B(B+→ρ0K*+)=(4.6±1.0±0.4)×10-6, the longitudinal polarization fL=0.78±0.12±0.03, and the CP-violation asymmetry ACP=0.31±0.13±0.03. We observe B+→f0(980)K*+ and measure the branching fraction B(B+→f0(980)K*+)×B(f0(980)→π+π-)=(4.2±0.6±0.3)×10-6 and the CP-violation asymmetry ACP=-0.15±0.12±0.03. The first uncertainty quoted is statistical and the second is systematic

    Diffusion Tensor Imaging in Preclinical and Human Studies of Huntington’s Disease: What Have we Learned so Far?

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