Study of Λb→Λ(ϕ,η(′))\Lambda_b\to \Lambda (\phi,\eta^{(\prime)}) and Λb→ΛK+K−\Lambda_b\to \Lambda K^+K^- decays

We study the charmless two-body $\Lambda_b\to \Lambda (\phi,\eta^{(\prime)})$ and three-body $\Lambda_b\to \Lambda K^+K^-$ decays. We obtain ${\cal B}(\Lambda_b\to \Lambda\phi)=(3.53\pm 0.24)\times 10^{-6}$ to agree with the recent LHCb measurement. However, we find that ${\cal B}(\Lambda_b\to \Lambda(\phi\to)K^+ K^-)=(1.71\pm 0.12)\times 10^{-6}$ is unable to explain the LHCb observation of ${\cal B}(\Lambda_b\to\Lambda K^+ K^-)=(15.9\pm 1.2\pm 1.2\pm 2.0)\times 10^{-6}$, which implies the possibility for other contributions, such as that from the resonant $\Lambda_b\to K^- N^*,\,N^*\to\Lambda K^+$ decay with $N^*$ as a higher-wave baryon state. For $\Lambda_b\to \Lambda \eta^{(\prime)}$, we show that ${\cal B}(\Lambda_b\to \Lambda\eta,\,\Lambda\eta^\prime)= (1.47\pm 0.35,1.83\pm 0.58)\times 10^{-6}$, which are consistent with the current data of $(9.3^{+7.3}_{-5.3},<3.1)\times 10^{-6}$, respectively. Our results also support the relation of ${\cal B}(\Lambda_b\to \Lambda\eta) \simeq {\cal B}(\Lambda_b\to\Lambda\eta^\prime)$, given by the previous study.Comment: 8 pages, 1 figure, revised version accepted by EPJ

The Multi-Site Order Fulfillment-Planning Model: A Global Corporation Case Study

A multi-site order fulfillment-planning model for the thin film transistor–liquid crystal display (TFT-LCD) panel industry is proposed. The order allocation problem is solved using a mathematical programming model considering practical characteristics, including product structures, customer preferences, alternative bill-of-material, and production constraints. A practical global corporation case in Taiwan will be employed to testify the feasibility of the proposed order fulfillment-planning model. Besides, the adaptability and comparison of different planning approaches in an environment of various market demands are discussed. Through the analysis of experiments, the proposed mathematical programming model is found to be better than the current popular method

A meson-exchange piN model up to energies sqrt(s) < 2.0 GeV

A meson-exchange piN model, previously constructed using three-dimensional reduction scheme of the Bethe-Salpeter equation for a model Lagrangian involving \pi, \eta, N, \Delta, rho, and \sigma fields, is extended to energies up to 2 GeV by including the \eta N channel and all the four stars \pi N resonances up to the F-waves. The effects of other 2 pion channels are taken into account phenomenologically. The extended model gives an excellent fit to both piN phase shifts and inelasticity parameters in all channels up to the F-waves. However, a few of the extracted resonance parameters differ considerably from the PDG values.Comment: 5 pages, 1 figire, 1 table. Talk presented at the 18th International Conference on "Few-Body Problems in Physics", Aug. 21-26, 2006, Santos, Brazi

Direct CP and T Violation in Baryonic B Decays

We review the direct CP and T violation in the three-body baryonic B decays in the standard model. In particular, we emphasize that the direct CP violating asymmetry in $B^\pm\to p\bar p K^{*\pm}$ is around 22% and the direct $T$ violating asymmetry in \bar B^0 \ra \Lambda \bar p \pi^+ can be as large as 12%, which are accessible to the current B factories at KEK and SLAC as well as SuperB and LHCb.Comment: 6 pages, Talk given at 4th International Conference on Flavor Physics (ICFP 2007), Beijing, China, 24-28 Sep 200

Study of B−→Λpˉη(′)B^-\to \Lambda\bar p\eta^{(')} and Bˉs0→ΛΛˉη(′)\bar B^0_s\to \Lambda\bar\Lambda\eta^{(')} decays

We study the three-body baryonic $B\to {\bf B\bar B'}M$ decays with $M$ representing the $\eta$ or $\eta'$ meson. Particularly, we predict that ${\cal B}(B^-\to\Lambda\bar p\eta,\Lambda\bar p\eta')=(5.3\pm 1.4,3.3\pm 0.7)\times 10^{-6}$ or $(4.0\pm 0.7,4.6\pm 1.1)\times 10^{-6}$, where the errors arise from the non-factorizable effects as well as the uncertainties in the $0\to {\bf B\bar B'}$ and $B\to{\bf B\bar B'}$ transition form factors, while the two different results are due to overall relative signs between the form factors, causing the constructive and destructive interference effects. For the corresponding baryonic $\bar B_s^0$ decays, we find that ${\cal B}(\bar B^0_s\to \Lambda\bar \Lambda \eta,\Lambda\bar \Lambda \eta')=(1.2\pm 0.3,2.6\pm 0.8)\times 10^{-6}$ or $(2.1\pm 0.6,1.5\pm 0.4)\times 10^{-6}$ with the errors similar to those above. The decays in question are accessible to the experiments at BELLE and LHCb.Comment: 15 pages, 5 figures, revised version accepted by EPJ

Persistent H. pylori colonization in early acquisition age of mice related with higher gastric sialylated Lewis x, IL-10, but lower interferon-γ expressions

<p>Abstract</p> <p>Background</p> <p><it>H. pylori </it>infection is less prevalent in childhood. This study validated whether the rates of <it>H. pylori </it>colonization depend on different acquisition ages, and correlate with the different gastric Lewis antigens or cytokine expressions after <it>H. pylori </it>acquisition.</p> <p>Methods</p> <p>We applied a young (7-day-old) C57BL/6 mice group (n = 50) and adult (6-week-old) C57BL/6 mice group (n = 50). In each group, 30 mice were challenged with <it>H. pylori </it>and 20 mice served as naïve control. The success of <it>H. pylori </it>colonization was assessed on the 2^ndweek and the 8^thweek, respectively. The intensity of the Lewis x, sialylated Lewis x<sup/>(sialyl-Le^x), and cytokine expressions, including TNF-α, IFN-γ, IL-6, IL-10, and IL-1β, were immunochemically stained and graded.</p> <p>Results</p> <p>On the 2^ndweek after <it>H. pylori </it>challenge, the colonization rates of <it>H. pylori </it>were similar between the young mice group and the adult mice group (89% vs. 100%, <it>P </it>> 0.05). However, on the 8^thweek, the <it>H. pylori </it>colonization rate was significantly lower in the young mice group than in the adult mice group (53% vs. 95%, <it>P </it>= 0.003). On the 8^thweek, the young mice with a persistence of <it>H. pylori </it>colonization had higher sialyl-Le^x, higher IL-10, and lower IFN-γ than those of the mice that lost colonization during the 2^ndto the 8^thweek (<it>P </it>< 0.05).</p> <p>Conclusion</p> <p>The persistence of <it>H. pylori </it>colonization could be an acquisition-age determinant process. After <it>H. pylori </it>exposure at an early acquisition age, the host response with a higher sialyl-Le^xand IL-10, but a lower IFN-γ correlates to the consequent persistence of <it>H. pylori </it>colonization.</p