4,766 research outputs found
Lepton flavor violating Higgs boson decays in seesaw models: new discussions
The lepton flavor violating decay of the Standard Model-like Higgs boson
(LFVHD), h->\mu\tau, is discussed in seesaw models at the one-loop level. Based
on particular analytic expressions of Passarino-Veltman functions, the two
unitary and 't Hooft Feynman gauges are used to compute the branching ratio of
LFVHD and compare with results reported recently. In the minimal seesaw (MSS)
model, the branching ratio was investigated in the whole valid range
10^{-9}-10^{15} GeV of new neutrino mass scale m_{n_6}. Using the Casas-Ibarra
parameterization, this branching ratio enhances with large and increasing
m_{n_6}. But the maximal value can reach only order of 10^{-11}. Interesting
relations of LFVHD predicted by the MSS and inverse seesaw (ISS) model are
discussed. The ratio between two LFVHD branching ratios predicted by the ISS
and MSS is simply m^2_{n_6}\mu^{-2}_X, where \mu_X is the small neutrino mass
scale in the ISS. The consistence between different calculations is shown
precisely from analytical approach.Comment: 4 figures, 26 pages, some analytic formulas and statements are
corrected. Main results are unchanged. New references added. Version
published in NP
Jahn-Teller Distortion and Ferromagnetism in the Dilute Magnetic Semiconductors GaN:Mn
Using first-principles total-energy methods, we investigate Jahn-Teller
distortions in III-V dilute magnetic semiconductors, GaAs:Mn and GaN:Mn in the
cubic zinc blende structure. The results for an isolated Mn impurity on a Ga
site show that there is no appreciable effect in GaAs, whereas, in GaN there is
a Jahn-Teller effect in which the symmetry around the impurity changes from
T to D or to C. The large effect in GaN occurs because of
the localized d character, which is further enhanced by the distortion. The
lower symmetry should be detectable experimentally in cubic GaN with low Mn
concentration, and should be affected by charge compensation (reductions of
holes and conversion of Mn ions to d with no Jahn-Teller effect).
Jahn-Teller effect is greatly reduced because the symmetry at each Mn site is
lowered due to the Mn-Mn interaction. The tendency toward ferromagnetism is
found to be stronger in GaN:Mn than in GaAs:Mn and to be only slightly reduced
by charge compensation.Comment: 6 pages, 3 figure
Superconductivity up to 30 K in the vicinity of quantum critical point in BaFe(AsP)
We report bulk superconductivity induced by an isovalent doping of phosphorus
in BaFe(AsP). The P-for-As substitution results in
shrinkage of lattice, especially for the FeAs block layers. The resistivity
anomaly associated with the spin-density-wave (SDW) transition in the undoped
compound is gradually suppressed by the P doping. Superconductivity with the
maximum of 30 K emerges at =0.32, coinciding with a magnetic quantum
critical point (QCP) which is evidenced by the disappearance of SDW order and
the linear temperature-dependent resistivity in the normal state. The
values were found to decrease with further P doping, and no superconductivity
was observed down to 2 K for 0.77. The appearance of superconductivity
in the vicinity of QCP hints to the superconductivity mechanism in iron-based
arsenides.Comment: 9 pages, 4 figures; more data; to appear in Journal of Physics:
Condensed Matte
Physicians, Primary Caregivers and Topical Repellent: All Under-Utilised Resources in Stopping Dengue Virus Transmission in Affected Households
BACKGROUND: Primary health care facilities frequently manage dengue cases on an ambulatory basis for the duration of the patient’s illness. There is a great opportunity for specific messaging, aimed to reduce dengue virus (DENV) transmission in and around the home, to be directly targeted toward this high-risk ambulatory patient group, as part of an integrated approach to dengue management. The extent however, to which physicians understand, and can themselves effectively communicate strategies to stop focal DENV transmission around an ambulatory dengue case is unknown; the matter of patient comprehension and recollection then ensues. In addition, the effectiveness of N,N-diethyl-3-methylbenzamide (DEET)-based insect repellent in protecting dengue patients from Aedes aegypti mosquitoes’ bites has not been investigated.
METHODOLOGY: A knowledge, attitude and practice (KAP) survey, focusing on the mechanisms of DENV transmission and prevention, was performed using semi-structured questionnaires. This survey was targeted towards the patients and family members providing supportive care, and physicians routinely involved in dengue patient management in Southern Vietnam. An additional clinical observational study was conducted to measure the efficacy of a widely-used 13% DEET-based insect repellent to repel Ae. aegypti mosquitoes from the forearms of dengue cases and matched healthy controls.
PRINCIPAL FINDINGS: Among both the physician (n = 50) and patient (n = 49) groups there were several respondents lacking a coherent understanding of DENV transmission, leading to some inappropriate attitudes and inadequate acute preventive practices in the household. The application of insect repellent to protect patients and their relatives from mosquito bites was frequently recommended by majority of physicians (78%) participating in the survey. Nevertheless, our tested topical application of 13% DEET conferred only ~1hr median protection time from Ae. aegypti landing. This is notably shorter than that advertised on the manufacturer’s label. No differences in landing time between febrile dengue cases or matched healthy controls (n = 19 experiments) were observed.
CONCLUSIONS/SIGNIFICANCE: Our study identifies missed opportunities for primary care physicians to improve public health through communication of strategies that could prevent focal dengue transmission in and around a case household. We advocate better access to more efficient communication methods for physicians and auxilliary health workers, supporting to educate those at high risk of DENV transmission. Our empirical testing of a widely-available 13% DEET-based repellent was limited in its protective efficacy against Ae. aegypti mosquito bites, and therefore DENV transmission, suggesting more frequent application is necessary to be beneficial
Van der Waals epitaxy of Bi2Se3 on Si(111) vicinal surface: An approach to prepare high-quality thin films of topological insulator
Epitaxial growth of topological insulator Bi2Se3 thin films on nominally flat
and vicinal Si(111) substrates is studied. In order to achieve planner growth
front and better quality epifilms, a two-step growth method is adopted for the
van der Waal epitaxy of Bi2Se3 to proceed. By employing vicinal Si(111)
substrate surfaces, the in-pane growth rate anisotropy of Bi2Se3 is explored to
achieve single crystalline Bi2Se3 epifilms, in which threading defects and
twins are effectively suppressed. Optimization of the growth parameters has
resulted in vicinal Bi2Se3 films showing a carrier mobility of ~ 2000 cm2V-1s-1
and the background doping of ~ 3 x 1018 cm-3 of the as-grown layers. Such
samples not only show relatively high magnetoresistance but also a linear
dependence on magnetic field.Comment: 18 pages, 4 figure
Market based approaches for food safety and animal health interventions in smallholder pig systems: the case of Vietnam
Food safety and animal health concerns place rising burdens on smallholder pig production in Viet Nam, both in terms of negatively affecting livelihoods and profitability as well as reducing consumer confidence in pork. While reducing the incidence of pig disease and improving the safety of pork products are potentially important public goods, it is critical to take into account the tradeoffs between improved animal health and food safety outcomes and their associated costs
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