BB Meson Matrix Elements from Various Heavy Quark Effective Theories

Various properties of heavy-light mesons are determined, including decay constants, the $B_{B}$-parameter, and the Isgur-Wise function. The heavy (bottom) quark is simulated with the static, NRQCD and/or (fixed-velocity) lattice-HQET effective theories, using optimally-smeared sources as produced by the ``Maximal Operator Smearing Technique''.Comment: To appear in the proceedings of the Lattice '95 conference. 4 pages, uuencoded-compressed PostScript fil

Cell Mediated and Humoral Immune responses to Mumps Virus: Recent Developments

Despite the extensive use of Mumps virus vaccines for almost forty years, there is still a paucity of knowledge concerning the Host-Pathogen Interaction. This paper reviews the advances in our knowledge of the antiviral immune response with particular reference to the selection of attenuated mumps virus strains used in different vaccine formulations. The ability of mumps viruses to evade the interferon component of the immune response is described in detail. This study also presents recent findings from our laboratory and others concerning the humoral and cell mediated responses to mumps virus. Particular attention is placed on mumps virus induction of interleukin-10 (IL-10) and the potential for this to be a novel immune evasion strategy is discussed. Finally, recent advances in our understanding of the immune response to mumps virus are placed in the broader context of our current understanding of this disease

Cell Mediated and Humoral Immune responses to Mumps Virus: Recent Developments

Despite the extensive use of Mumps virus vaccines for almost forty years, there is still a paucity of knowledge concerning the Host-Pathogen Interaction. This paper reviews the advances in our knowledge of the antiviral immune response with particular reference to the selection of attenuated mumps virus strains used in different vaccine formulations. The ability of mumps viruses to evade the interferon component of the immune response is described in detail. This study also presents recent findings from our laboratory and others concerning the humoral and cell mediated responses to mumps virus. Particular attention is placed on mumps virus induction of interleukin-10 (IL-10) and the potential for this to be a novel immune evasion strategy is discussed. Finally, recent advances in our understanding of the immune response to mumps virus are placed in the broader context of our current understanding of this disease

Heavy Light Weak Matrix Elements

I review the status of lattice calculations of heavy-light weak matrix elements, concentrating on semileptonic B decays to light mesons, B -> K* gamma, the B meson decay constant, f_B, and the mixing parameter B_B.Comment: 12 pages, LaTeX2e with 6 postscript figures. Uses espcrc2.sty and epsf.sty (included). Talk presented at LATTICE96(heavy quarks

A Study of the Static-Light BBB_B Parameter

We calculate the $B_B$ parameter, relevant for $\overline{B}^0$--$B^0$ mixing, from a lattice gauge theory simulation using the static approximation for the heavy quark and the Wilson action for the light quark and gauge fields. Improved sources, produced by an optimized variational technique, {\sc most}, reduce statistical errors and minimize excited-state contamination of the ground-state signal. Renormalization of four-fermion operator coefficients, using the Lepage-Mackenzie procedure for estimating typical momentum scales, is linearized to reduce order $\alpha_s^2$ uncertainties.Comment: 4 pages (LaTeX), Talk presented at LATTICE96(heavy quarks), Minor numerically-insignificant changes made and reference adde

Semileptonic Form Factors

I report the current status of the heavy-light decay constants, the bag parameters and the semileptonic form factors. I compare the heavy-light decay constants with Wilson-Wilson and clover-clover fermions. Systematic errors such as scale setting and renormalization factors are also discussed. 1/M dependences for the heavy-light semileptonic form factors near $q^2 = q^2_max$ with clover-clover and NRQCD-Wilson fermions are found to be small.Comment: 12 pgs. 15 figures. Talk presented at LATTICE9

Heavy-Light Meson Decay Constants on the Lattice

We present a high statistics study of the D- and B-meson decay constants. The results were obtained by using the Clover and Wilson lattice actions at $\beta=6.0$ and 6.2.Comment: 3 pages, 2 ps figures; Talk presented at LATTICE '9

An Analytic Formula and an Upper Bound for epsilon'/epsilon in the Standard Model

Using the idea of the penguin box expansion we find an analytic expression for epsilon'/epsilon in the Standard Model as a function of m_t, m_s(m_c) and two non-perturbative parameters B_6 and B_8. This formula includes next-to-leading QCD/QED short distance effects calculated recently by means of the operator product expansion and renormalization group techniques. We also derive an analytic expression for the upper bound on epsilon'/epsilon as a function of |V_cb|, |V_ub/V_cb|, B_K and other relevant parameters. Numerical examples of the bound are given.Comment: 10 pages with 1 figure appended in PostScript format; MPI preprint MPI-Ph/93-60 and TU preprint TUM-T31-47/9

Heavy quark mass dependence of semileptonic form factors for B decays

We present our study of the dependence of the heavy-to-light semileptonic B decay form factors on the heavy-light meson mass $M_{PS}$. Simulations are made over a range of the heavy quark mass covering both the charm and bottom quarks using the $O(a)$-improved clover action at $\beta=5.9$ on a $16^3\times 40$ and $24^3\times 64$ lattice. We find that a weak dependence of form factors on $M_{PS}$ observed in previous studies in the region of charm quark persists up to the region of$b$ quark. The soft pion relation $f^0(q^2_{max})=f_B/f_\pi$ is examined and found to be largely violated.Comment: 3 pages, latex source-file, 4 figures as epsf-file, uses espcrc2.sty. Talk presented by S. Tominaga at Lattice 97, Edinburgh, Scotland, 22-26 Jul 199