Light-Front Quark Model Analysis of Exclusive 0−0^{-}→\to0−0^{-} Semileptonic Heavy Meson Decays

We present the analysis of exclusive $0^{-}$$\to$$0^{-}$ semileptonic heavy meson decays using the constituent quark model based on the light-front quantization. Our model is constrained by the variational principle for the well-known linear plus Coulomb interaction motivated by QCD. Our method of analytic continuation to obtain the weak form factors avoids the difficulty associated with the contribution from the nonvalence quark-antiquark pair creation. Our numerical results for the heavy-to-heavy and heavy-to-light meson decays are in a good agreement with the available experimental data and the lattice QCD results. In addition, our model predicts the two unmeasured mass spectra of $^{1}S_{0}(b\bar{b})$ and $^{3}S_{1}(b\bar{s})$ systems as $M_{b\bar{b}}$=9657 MeV and $M_{b\bar{s}}$= 5424 MeV.Comment: 16 pages including 5 figures; version to be published in Phys. Lett.

New effective treatment of the light-front nonvalence contribution in timelike exclusive processes

We discuss a necessary nonvalence contribution in timelike exclusive processes. Following a Schwinger-Dyson type of approach, we relate the nonvalence contribution to an ordinary light-front wave function that has been extensively tested in the spacelike exclusive processes. A complicate four-body energy denominator is exactly cancelled in summing the light-front time-ordered amplitudes. Applying our method to $K_{\ell3}$ and $D^0\to K^- \ell^+ \nu_l$ where a rather substantial nonvalence contribution is expected, we find not only an improvement in comparing with the experimental data but also a covariance(i.e. frame-independence) of existing light-front constituent quark model.Comment: 10 pages including 5 figures; Changes: 1-added some sentences; 2-enlarged the figures; 3-added some reference

Building multidisciplinary, interdisciplinary, and transdisciplinary surveillance partnership

A discipline is a branch of knowledge. Examples are biology, chemistry and history. Real world problems are complex problems which do not respect artificial disciplinary boundaries. Public health surveillance is increasingly facing new challenges that require multiple disciplinary partnership to resolve. Partnership refers to two or more people or organizations that work together. The terms multidisciplinary, interdisciplinary and transdisciplinary are often used interchangeably but they have specific meanings. The objectives of this keynote presentation are to (1) define and compare the three multiple disciplinary approaches, using examples of several surveillance networks including the World Alliance for Risk Factor Surveillance (WARFS) and Americas' Network for Chronic Disease Surveillance (AMNET); (2) discuss a number of promotors of teamwork and partnership building; and (3) present a roadmap on where to find multiple disciplinary collaboration based on a review of the knowledge universe

Bonding and Spreading: Co-Creative Relationships and Interaction with Consumers in South Korea's Indie Music Industry

Purpose: Although social media proficiency and use are key business and marketing practices in today's digital environment, research has failed to offer sufficient insights into what drives small firms to use social media and how they vitalise co-creative social media environments with consumers. In response, we conducted a qualitative research study to examine how small firms utilise social media to interact and build bonds with consumers. These bonds become an important tool in the development of successful, profitable businesses and marketing practices in the digital age.  Design/methodology/approach: To examine how small firms use social media to engage with consumers and vice versa, we utilised a case-study approach and collected qualitative data by conducting semi-structured interviews.  Findings: Our results showed that the small firms in this research seek to establish relationships and facilitate interactions with their core consumers in order to co-create value. In particular, our data demonstrate that producers engage in two distinctive practices: bonding (i.e. cultivating emotional ties with music fans) and spreading (i.e. encouraging expressive circulation by fans). Altogether, our findings indicate that the representative firms in this research use social media to develop synergistic relationships with consumers and to tap into the collective energy of consumers in their business environments.  Originality/value: We show that small companies use social media to establish relationships and interact with fans in order to co-create value and vitalise collective consumption, engagement and participation. The case blurs the traditional distinction between production and consumption and suggests that the value of goods is a social creation, not merely a manufactured product

B-Physics Phenomenology with Emphasis on the Light-Cone

Theoretical overviews on the B-physics are presented with an emphasis on the light-cone degrees of freedom. Our new treatment of the embedded states seems to give an encouraging result.Comment: 10 pages including 2 figures, elsart.sty; invited talk presented at the Tenth International Light-Cone Meeting on Non-Perturbative QCD and Hadron Phenomenology, Heidelberg, June 12-17, 200

Threshold Pion Electroproduction in Chiral Perturbation Theory

Electroproduction of pions on the nucleon near the threshold is analyzed within the framework of baryon chiral perturbation theory. We give a thorough discussion of the low--energy theorems related to charged and neutral electropionproduction. It is shown how the axial radius of the nucleon can be related to the S--wave multipoles $E_{0+}^{(-)}$ and $L_{0+}^{(-)}$. The chiral perturbation theory calculations of the $\gamma^\star p \to \pi^0 p$ reaction are found to be in good agreement with the recent near threshold data. We also discuss the influence of some isospin--breaking effects in this channel. For future experimental tests of the underlying chiral dynamics, extensive predictions of differential cross sections and multipole amplitudes are presented.Comment: 44pp, TeX, 15 figures available upon request, BUTP-93/23 and CRN 93-4

New Developments in Treacherous Points of Light-Front Dynamics

Light-front dynamics(LFD) plays an important role in hadron phenomenology. Last few years, however, it has been emphasized that treacherous points such as zero-mode contributions should be taken into account for successful LFD applications to hadron phenomenology. We discuss examples of treacherous points and present new progresses made last few years to handle them correctly.Comment: 5 pages, espcrc1.sty. proceedings of FB XVIII (August 2006, Brazil), to be published in Nucl. Phys.