Possible huge enhancement in the radiative decay of the weal W boson into the charmed DsD_{s} meson

We point out that the rare decay mode $W^{\pm} \rightarrow \gamma + D^{\pm}_{s}$ could be spectacularly enhanced, with a branching ratio around $10^{-6}$ which is three order of magnitude larger than previous predictions. Its observation will determine the W boson mass with great accuracy, providing additional high precision tests of the standard model, as well as reveal eventual deviation from the trilinear non-abelian gauge coupling.Comment: 14, PAR/LPTHE 93 - 0

Tracking Simulations Near Half-Integer Resonance at PEP-II

Beam-beam simulations predict that PEP-II luminosity can be increased by operating the horizontal betatron tune near and above a half-integer resonance. However, effects of the resonance and its synchrotron sidebands significantly enhance betatron and chromatic perturbations which tend to reduce dynamic aperture. In the study, chromatic variation of horizontal tune near the resonance was minimized by optimizing local sextupoles in the Interaction Region. Dynamic aperture was calculated using tracking simulations in LEGO code. Dependence of dynamic aperture on the residual orbit, dispersion and distortion of beta function after correction was investigated.Comment: 4 page

Spherical Structures in Conformal Gravity and its Scalar-Tensor Extension

We study spherically-symmetric structures in Conformal Gravity and in a scalar-tensor extension and gain some more insight about these gravitational theories. In both cases we analyze solutions in two systems: perfect fluid solutions and boson stars of a self-interacting complex scalar field. In the purely tensorial (original) theory we find in a certain domain of parameter space finite mass solutions with a linear gravitational potential but without a Newtonian contribution. The scalar-tensor theory exhibits a very rich structure of solutions whose main properties are discussed. Among them, solutions with a finite radial extension, open solutions with a linear potential and logarithmic modifications and also a (scalar-tensor) gravitational soliton. This may also be viewed as a static self-gravitating boson star in purely tensorial Conformal Gravity.Comment: 24 pages, revised version, accepted for publication in Phys. Rev.

Forage Resources in Livestock-Cropping Smallholder Systems. a Case Study of Farmers at Transmigration Areas of Dompu, West Nusa Tenggara

A study aimed to identify the farmer practice in providing feed for their Bali cattle was undertaken at Satuan Pemukiman A (SPA) sub-village, Manggalewa sub district, Dompu, West Nusa Tenggara, a region of highly variable rainfall patterns and lengthy dry seasons. A critical aspect of this study was the detailed characterization of the availability, quality and USAge patterns for existing forage resource within the SPA mixed crop-livestock farming system. The study found that SPA farmers used varying mixtures of free or tethered grazing and cut and carry to supply the forage needs of their cattle. The available grazing was of good quality and supply in the wet season but declined rapidly by early dry season. From mid-dry season on, the vast majority of farmers relied increasingly on cut and carry forage from a range of sources including volunteer pastures, crop residues, shrub legumes and finally other sources such as banana and papaya stem, cashew apple and native tree leaves in the late dry season. Despite some use of high quality shrub legumes such as Leucaena leucocephala and Gliricidia sepium the quantity and quality of available forage was often below maintenance, especially for lactating cows. The study also revealed that existing forage sources such as the shrub legumes L. leucocephala and G. sepium maintained high levels of crude protein and digestibility year round. Greater use of shrub legumes (especially G. sepium) and conserved forages have the potential to significantly reduce the feed gap in the second half of the dry season at SPA

Spherical Non-Abelian Solutions in Conformal Gravity

We study static spherically-symmetric solutions of non-Abelian gauge theory coupled to Conformal Gravity. We find solutions for the self-gravitating pure Yang-Mills case as well as monopole-like solutions of the Higgs system. The former are localized enough to have finite mass and approach asymptotically the vacuum geometry of Conformal Gravity, while the latter do not decay fast enough to have analogous properties.Comment: 12 pages, revised version, accepted for publication in Phys. Rev.

Children’s buying behaviour in China: A study of their information sources

Purpose Reports an empirical study on children’s buying behaviour in China with a special focus on their information sources. Design /Methodology The key literature on consumer socialisation of children is reviewed. Primary data was collected from a sample of 155 children aged 10 to 13 using questionnaire survey. Various statistical methods such as Pearson correlation and tests were employed to analyse the data. Findings Chinese children regard TV commercials as an important information source for new product. However, they place greater level of trust in interpersonal information sources, especially in their parents who are perceived as the most credible information source with respect to their learning about new food products. Originality /Value The study has made a contribution to the extant literature on Chinese children as consumer. The findings would be valuable in assisting companies, specially those in the food industry, to have a better understanding of Chinese children’s buying behaviour

Impurity-doping induced ferroelectricity in frustrated antiferromagnet CuFeO2

Dielectric responses have been investigated on the triangular-lattice antiferromagnet CuFeO2 and its site-diluted analogs CuFe1-xAlxO2 (x=0.01 and 0.02) with and without application of magnetic field. We have found a ferroelectric behavior at zero magnetic field for x=0.02. At any doping level, the onset field of the ferroelectricity always coincides with that of the noncollinear magnetic structure while the transition field dramatically decreases to zero field with Al doping. The results imply the further possibility of producing the ferroelectricity by modifying the frustrated spin structure in terms of site-doping and external magnetic field.Comment: 4 pages, 4 figure