Improving bounds on flavor changing vertices in the two Higgs doublet model from B−BˉB-\bar{B} mixing

We find some constraints on the flavor changing vertices of the two Higgs doublet model, from the \Delta M_{B_{d}} measurement. Although bounds from this observable have already been considered, this paper takes into account the role of a new operator not included previously, as well as the vertices \xi_{bb}, \xi_{tc} and \xi_{sb}. Using the Cheng-Sher parametrization, we found that for a relatively light charged Higgs boson (200-300 GeV), we get that \lambda _{tt}<1, while the parameter \lambda_{bb} could have values up to about 50. In addition, we use bounds for \lambda_{tt} and \lambda_{bb} obtained from B^{0}->X_{s}\gamma at next to leading order, and studied the case where the only vanishing vertex factors are the ones involving quarks from the first family. We obtained that \Delta M_{B_{d}} is not sensitive to the change of the parameter \lambda_{sb}, while \lambda_{tc}<1Comment: 4 pages, 1 figure, LaTeX2

PILOT APPRAISAL OF VARIABLES AMONG MEXICAN-AMERICANS FOR SOCIAL NETWORKS ANALYSIS

poster abstractHispanics in the USA often suffer poor oral health. More appropriate solutions may be designed if we move beyond the simplistic interpretation of poor oral outcomes being associated with 1-2 variables, e.g., language; such an approach has failed to provide consistent interpretations, and offers no points for intervention. We propose to examine a constellation of variables interwoven into multilevel strategies under a new(er) paradigm, social network theories (http://cmol.nbi.dk/models/infoflow/infoflow.html). Objectives: To qualitatively identify domains of variables modulating oral health outcomes among 1st-2nd generation MexicanAmerican immigrants. Methods: Through key informant interviews, we ascertained KAB variables in immigrant families originating in Jalisco, Mexico. This community has had a strong, revolving presence for decades in a well-delimited location in Indianapolis, IN, around St. Patrick’s parish. We did not conduct clinical exams but used questions from American national surveys to document health perceptions, availability of dental services/insurance, presence of dental pain and impaired function in adults and children, and family structure and sociodemographic profiles during a Catholic festival (no incentives, no appointments). Data were content-analyzed. Results: Data were collected from 22 parent-child dyads (15 female adults, 7 male; mean age 24±6.3yrs; data from the oldest child and the interviewee). Frequencies of dental emergencies and acute problems varied markedly, with recurrence patterns. A minority exhibited consistent dental attendance, often enabled by public/private dental insurance. Time in the USA varied considerably, with 1st and 2nd generation immigrant parents and children sharing the household. Occupations ranged from manual to clerical, and education from elementary to college among adults. Conclusion: Interviews were feasible and acceptable, and the experience informed future fieldwork considerations. We are using the variables to design a social networks study to characterize the evolution of patterns between families in Indianapolis and among peers living in Jalisco, aiming to measure impacts ascribable to immigration along acculturation spectra

Kinetic energy oscillations in annular regions of ultracold neutral plasmas

A study of ion equilibration in annular regions of ultracold strontium plasmas is reported. Plasmas are formed by photoionizing laser-cooled atoms with a pulsed dye laser. The experimental probe is spatially-resolved absorption spectroscopy using the 2S1/2-2P1/2 transition of the Sr+ ion. The kinetic energy of the ions is calculated from the Doppler broadening of the spectrum, and it displays clear oscillations during the first microsecond after plasma formation. The oscillations, which are a characteristic of strong coulomb coupling, are fit with a simple phenomenological model incorporating damping and density variation in the plasma

Granular discharge and clogging for tilted hoppers

We measure the flux of spherical glass beads through a hole as a systematic function of both tilt angle and hole diameter, for two different size beads. The discharge increases with hole diameter in accord with the Beverloo relation for both horizontal and vertical holes, but in the latter case with a larger small-hole cutoff. For large holes the flux decreases linearly in cosine of the tilt angle, vanishing smoothly somewhat below the angle of repose. For small holes it vanishes abruptly at a smaller angle. The conditions for zero flux are discussed in the context of a {\it clogging phase diagram} of flow state vs tilt angle and ratio of hole to grain size

Influence of production variables and starting material on charcoal stable isotopic and molecular characteristics

We present a systematic study on the effect of starting species, gas composition, temperature, particle size and duration of heating upon the molecular and stable isotope composition of high density (mangrove) and low density (pine) wood. In both pine and mangrove, charcoal was depleted in o13C relative to the starting wood by up to 1.6&#37; and 0.8&#37;, respectively. This is attributed predominantly to the progressive loss of isotopically heavier polysaccharides, and kinetic effects of aromatization during heating. However, the pattern of o13C change was dependant upon both starting species and atmosphere, with different structural changes associated with charcoal production from each wood type elucidated by Solid-State o13C Nuclear Magnetic Resonance Spectroscopy. These are particularly evident at lower temperatures, where variation in the oxygen content of the production atmosphere results in differences in the thermal degradation of cellulose and lignin. It is concluded that production of charcoal from separate species in identical conditions, or from a single sample exposed to different production variables, can result in significantly different o13C of the resulting material, relative to the initial wood. These results have implications for the use of charcoal isotope composition to infer past environmental change