FURTHER RANGE EXTENSIONS OF MEXICAN ACANTHACEAE

The distribution, of 35 species of AmericanAcanthaceae is extended to regions inMexico where they were previouslyunknown. Ruellia macrophylla Vahl isreported from Mexico for the first time anda complete description and illustration of itis provided. The distribution of 34 speciesalready known from Mexico is extended tostates from which they have not beenpreviously reported. As a result, newdistribution records are noted for 21 Mexicanstates.La distribución de 35 especies americanasde Acanthaceae se extiende a regiones deMéxico donde anteriormente no se lesconocia. Ruellia macrophylla Vahl se registra en México por primera vez y seproporciona una descripción completa eilustrativa de ella. La distribución de 34especies ya conocidas de México se indicanpara estados en los que no habían sidoreportadas. Como resultado, la nuevadistribución se indica para 21 estadosmexicanos

Model-Independent Description and Large Hadron Collider Implications of Suppressed Two-Photon Decay of a Light Higgs Boson

For a Standard Model Higgs boson with mass between 115 GeV and 150 GeV, the two-photon decay mode is important for discovery at the Large Hadron Collider (LHC). We describe the interactions of a light Higgs boson in a more model-independent fashion, and consider the parameter space where there is no two-photon decay mode. We argue from generalities that analysis of the $t\bar t h$ discovery mode outside its normally thought of range of applicability is especially needed under these circumstances. We demonstrate the general conclusion with a specific example of parameters of a type I two-Higgs doublet theory, motivated by ideas in strongly coupled model building. We then specify a complete set of branching fractions and discuss the implications for the LHC.Comment: 4 pages, 4 figure

The information of high-dimensional time-bin encoded photons

We determine the shared information that can be extracted from time-bin entangled photons using frame encoding. We consider photons generated by a general down-conversion source and also model losses, dark counts and the effects of multiple photons within each frame. Furthermore, we describe a procedure for including other imperfections such as after-pulsing, detector dead-times and jitter. The results are illustrated by deriving analytic expressions for the maximum information that can be extracted from high-dimensional time-bin entangled photons generated by a spontaneous parametric down conversion. A key finding is that under realistic conditions and using standard SPAD detectors one can still choose frame size so as to extract over 10 bits per photon. These results are thus useful for experiments on high-dimensional quantum-key distribution system.Comment: 18 pages, 6 figure

Comparative Advantage, Learning, and Sectoral Wage Determination

We develop a model in which a worker's skills determine the worker's current wage and sector. Both the market and the worker are initially uncertain about some of the worker's skills. Endogenous wage changes and sector mobility occur as labor-market participants learn about these unobserved skills. We show how the model can be estimated using non-linear instrumental-variables techniques. We then apply our methodology to study the wages and allocation of workers across occupations and across industries. For both occupations and industries, we find that high-wage sectors employ high-skill workers and offer high returns to workers' skills. Estimates of these sectoral wage differences that do not account for sector-specific returns are therefore misleading. We also suggest further applications of our theory and methodology.