Model-Independent Determinations of B -> D l nu , D* l nu Form Factors

We present nonperturbative, model-independent parametrizations of the individual QCD form factors relevant to B -> D* l nu and B -> D l nu decays. These results follow from dispersion relations and analyticity, without recourse to heavy quark symmetry. To describe a form factor with two percent accuracy, three parameters are necessary, one of which is its normalization at zero recoil, F(1). We combine the individual form factors using heavy quark symmetry to extract values for the product |V_{cb}| F(1) from B -> D* l nu data with negligible extrapolation uncertainty.Comment: uses harvmac and epsf, 22 pages, 3 eps figures include

Modern Poultry Housing

A MODERN POULTRY HOUSE is an asset to a farm. It need not be expensive to give good results. Often some building already on the farm can be remodeled inexpensively to serve the needs of hens. Where old buildings are not available, new housing should be considered. Remodeling or building new poultry housing is a very important job. In order to invest money wisely, careful attention should be given to planning, choice of materials, arrangement of floor plan and use of labor saving devices. A modern, well organized house can do a lot of the chores for the poultry operator. Too often a poultry house is thought of only as a roosting place for the hens. In addition to this it must protect the birds from the hot sun in summer, the cold temperatures in winter and temperature extremes in spring and fall. If properly insulated and ventilated, it will provide a warm, dry place for the hens that will mean good egg production at all times of the year. The purpose of this circular is to discuss the principles of poultry housing and the use of some labor saving devices. Many of these devices can be installed when a house is being built with little additional expense. Plans are available for two types of p oultry houses from the Extension Agricultural Engineer, College Station, South D akota-Extension Circular 504, Modern Poultry Housing Plans for the New South Dakota Laying House ( 24 x 34) for 300 hens and Circular 515 Modern Poultry Housing Plans for the 30 x 50 South Dakota Laying House for 500 hens

The quest for the Cabibbo Kobayashi Maskawa Matrix

A piece of the Standard Model presently undergoing intense experimental scrutiny is the Cabibbo Kobayashi Maskawa matrix. Several different measurements are planned to enrich the spectrum of experimental constraints and thus provide one of the most stringent tests of Standard Model validity. The success of this program is closely related to theoretical progress in evaluating QCD matrix elements in a non-perturbative regime, as we need to extract fundamental quark properties from observations on decays involving hadrons. This interplay between experimental and theoretical progress will be illustrated in the context of the present knowledge of the magnitudes of the quark mixing parameters $| V_{cb}|$ and $| V_{ub}|$.Comment: 10 pages, 1 figure, contributed paper to BEAUTY 200