40,731 research outputs found

    Determination of the CP Phase γ\gamma with Possibility of New Physics

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    We propose a new method to extract the CP violating weak phase γ\gamma in the CKM paradigm of the Standard Model, using BD0πfπB^- \to D^0 \pi^- \to f \pi^- and BDˉ0πfπB^- \to \bar D^0 \pi^- \to f \pi^- decays, where ff are final states such as K+πK^+ \pi^-, K+ρK^+ \rho^-, KππK \pi\pi, {\it etc.} We also study the experimental feasibility of our new method. With possibility of new phases in the CKM matrix, we re-examine some of the previously proposed methods to determine γ\gamma, and find that it would be in principle possible to identify γ\gamma and a new phase angle θ\theta separately.Comment: 4 pages, LaTeX; Using two-column style file (ltwol.sty); To be published in the Proceedings of the Fourth International Workshop on B Physics and CP Violation, Ise-Shima, Japan, February 18 - 23, 200

    Determination of the CP violating weak phase γ\gamma from the Decays BDπB \to D \pi

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    We propose a new method to extract the CP violating weak phase γ\gamma (the phase of VubV_{ub}^*) in the CKM paradigm of the Standard Model, using BD0πfπB^- \rightarrow D^0 \pi^- \rightarrow f \pi^- and BDˉ0πfπB^- \rightarrow \bar D^0 \pi^- \rightarrow f \pi^- decays, where ff are final states such as K+πK^+ \pi^-, K+ρK^+ \rho^-, KππK \pi\pi, {\it etc.} We also study the experimental feasibility of our new method. With possibility of new phases in the CKM matrix, we re-examine some of the previously proposed methods to determine γ\gamma, and find that it would be in principle possible to identify γ\gamma and a new phase angle θ\theta separately.Comment: 12 pages, 1 figure, LaTex; the version to be published in European Physical Journal

    Charmless Non-Leptonic B Decays and R-parity Violating Supersymmetry

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    We examine the charmless hadronic B decay modes in the context of R-parity violating (\rpv) supersymmetry. We try to explain the large branching ratio (compared to the Standard Model (SM) prediction) of the decay B±ηK±B^{\pm}\to \eta' K^{\pm}. There exist data for other observed η()\eta^{(\prime)} modes and among these modes, the decay B0ηK0B^{0}\to \eta K^{*0} is also found to be large compared to the SM prediction. We investigate all these modes and find that only two pairs of \rpv coupling can satisfy the requirements without affecting the other B\ra PP and B\ra VP decay modes barring the decay B\ra\phi K. From this analysis, we determine the preferred values of the \rpv couplings and the effective number of color NcN_c. We also calculate the CP asymmetry for the observed decay modes affected by these new couplings.Comment: 14 pages, 7 figures; revtex; version published in Phys. Lett.

    Hadronic B Decays to Charmless VT Final States

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    Charmless hadronic decays of B mesons to a vector meson (V) and a tensor meson (T) are analyzed in the frameworks of both flavor SU(3) symmetry and generalized factorization. We also make comments on B decays to two tensor mesons in the final states. Certain ways to test validity of the generalized factorization are proposed, using BVTB \to VT decays. We calculate the branching ratios and CP asymmetries using the full effective Hamiltonian including all the penguin operators and the form factors obtained in the non-relativistic quark model of Isgur, Scora, Grinstein and Wise.Comment: 27 pages, no figures, LaTe

    Prediction of airfoil stall using Navier-Stokes equations in streamline coordinates

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    A Navier-Stokes procedure to calculate the flow about an airfoil at incidence was developed. The parabolized equations are solved in the streamline coordinates generated for an arbitrary airfoil shape using conformal mapping. A modified k-epsilon turbulence model is applied in the entire domain, but the eddy viscosity in the laminar region is suppressed artificially to simulate the region correctly. The procedure was applied to airfoils at various angles of attack, and the results are quite satisfactory for both laminar and turbulent flows. It is shown that the present choice of the coordinate system reduces the error due to numerical diffusion, and that the lift is accurately predicted for a wide range of incidence
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