Higgs boson pair production in non-linear Effective Field Theory with full mtm_t-dependence at NLO QCD

We present a calculation of the NLO QCD corrections to Higgs boson pair production within the framework of a non-linearly realised Effective Field Theory in the Higgs sector, described by the electroweak chiral Lagrangian. We analyse how the NLO corrections affect distributions in the Higgs boson pair invariant mass and the transverse momentum of one of the Higgs bosons. We find that these corrections lead to significant and non-homogeneous K-factors in certain regions of the parameter space. We also provide an analytical parametrisation for the total cross-section and the $m_{hh}$ distribution as a function of the anomalous Higgs couplings that includes NLO corrections. Such a parametrisation can be useful for phenomenological studies.Comment: 40 pages, 26 figures, v2: published version; v3: ancillary files for 13, 14 and 27 TeV for LO and NLO differential cross sections and usage example adde

Efecto de la adición de organo-hidrotalcita a un suelo agrícola en el comportamiento de los fungicidas tebuconazol y metalaxil bajo condiciones reales de campo

2 páginas.-- 2 tablas.-- 2 referencias.-- Poster presentado en XXIV Reunión de la Sociedad Española de Arcillas Sevilla. Libro de Resúmenes: Noviembre de 2015 en Sevilla.Existen numerosos trabajos que abordan las aplicaciones de arcillas naturales, inalteradas o modificadas, como adsorbentes de pesticidas para la depuración de aguas e incluso para actuar como soportes en formulaciones de liberación lenta del pesticida o como barreras inmovilizantes en suelos (Cornejo et al., 2008). La mayoría de estos estudios se han realizado bajo condiciones controladas en el laboratorio y usando minerales de la arcilla naturales del grupo de las esmectitas. En los últimos años, ha aumentado el interés por explotar las propiedades adsorbentes de los hidróxidos dobles laminares (HDLs), también conocidos como hidrotalcitas (HTs) o arcillas aniónicas, cuyas características estructurales guardan cierta relación con las de las esmectitas (Cornejo et al., 2008). Los LDHs consisten en láminas del tipo brucita de un metal divalente con sustituciones isomórficas que proporcionan a las láminas una carga permanente positiva y que es compensada con aniones intercambiables que se sitúan en el espacio interlaminar. Aunque los resultados obtenidos hasta ahora ponen de manifiesto la elevada capacidad de adsorción de los LDHs para muchos pesticidas y la versatilidad que les confiere la posibilidad de modificarlos mediante la intercalación de aniones orgánicos en el espacio interlaminar (Celis et al., 2014), su utilidad como enmendantes para aumentar la capacidad de adsorción de los suelos bajo condiciones ambientales reales aún no ha sido evaluada.Este trabajo ha sido financiado por el Ministerio de Economía y Competitividad (MINECO) a través de los proyectos AGL2011-23779 y AGL2014-51897-R y por la Junta de Andalucía a través del Grupo de Investigación AGR-264, con parte de fondos FEDER-FSE. R. López-Cabeza agradece al MINECO la concesión de una beca pre-doctoral de FPI asociada al proyecto AGL2011-23779.Peer reviewe

Effect of synthetic clay and biochar addition on dissipation and enantioselectivity of tebuconazole and metalaxyl in an agricultural soil: Laboratory and field experiments

10 páginas.-- 4 figuras.-- 3 tablas.-- referencias.-- Supplementary data associated with this article can be found, in the online version, at http://dx.doi.org/10.1016/j.agee.2016.05.017Laboratory and field experiments were conducted to assess how the addition of oleate-modified hydrotalcite (clay) and biochar (BC) to an agricultural soil affected the sorption, leaching, persistence, and enantiomeric composition of soil residues of two chiral fungicides, tebuconazole and metalaxyl. Laboratory experiments showed that the sorption of both fungicides ranked as follows: unamended soil < BC-amended soil < clay-amended soil. The addition of clay at a rate of 1% increased metalaxyl soil sorption coefficient (Kd) from 0.34 to 3.14 L kg−1 and that of tebuconazole from 2.4 to 47.4 L kg−1. In our experimental set-up, field plots were either unamended or amended with clay (2 t ha−1) or BC (4 t ha−1), and subsequently treated with a mixture of tebuconazole and metalaxyl at 3 and 6 kg ha−1, respectively. The leaching, persistence, and enantiomer composition of fungicides residues were monitored by sampling at different soil depths (0–5, 5–10, 10–20 cm) for 98 days. No significant changes in the scarce mobility and long persistence of tebuconazole upon amending the soil with clay or BC were observed. In contrast, sorption to clay and BC particles reduced the leaching and degradation of metalaxyl and the clay increased its persistence in the topsoil compared to the unamended soil. The enantioselective analysis of tebuconazole and metalaxyl soil residues indicated that tebuconazole remained mostly racemic along the experiment, whereas for metalaxyl the concentration of S-enantiomer was greater than the concentration of R-enantiomer, more so at longer experimental times and deeper horizons. Nevertheless, for the top 0–5 cm soil layer metalaxyl remained more racemic in clay- and BC-amended soil than in unamended soil. Our results show that addition of amendments with high sorptive capacities can be beneficial in reducing leaching and degradation losses of chiral pesticide enantiomers from the topsoil, and that sorption by the amendments can influence the final enantiomeric composition of pesticide residues.This work was financed by the Spanish Ministry of Economy and Competitiveness (MINECO Projects AGL2011-23779, AGL2013-48446-C3-1-R and AGL2014-51897-R) and Junta de Andalucía (JA Research Group AGR-264), with FEDER-FSE funds. R. López-Cabeza thanks MINECO for a pre-doctoral fellowship linked to the Project AGL2011-23779 (Grant BES-2012-059945). The authors also thank P. Franco (Chiral Technologies Europe) and I. Girón (IRNAS) for their technical assistancePeer reviewe

Higgs boson pair production in non-linear Effective Field Theory with full m(t) -dependence at NLO QCD

We present a calculation of the NLO QCD corrections to Higgs boson pair production within the framework of a non-linearly realised Effective Field Theory in the Higgs sector, described by the electroweak chiral Lagrangian. We analyse how the NLO corrections affect distributions in the Higgs boson pair invariant mass and the transverse momentum of one of the Higgs bosons. We find that these corrections lead to significant and non-homogeneous K-factors in certain regions of the parameter space. We also provide an analytical parametrisation for the total cross-section and the m(hh) distribution as a function of the anomalous Higgs couplings that includes NLO corrections. Such a parametrisation can be useful for phenomenological studies

Correlaciones entre circunferencia escrotal y algunas medidas zoométricas con el peso testicular en borregos pelibuey

EI trabajo se desarrolló con el objeto de correlacionar el peso testicular con la circunferencia escrotal y algunas medidas zoométricas

Triploidía (69 xxx): reporte de caso

Las aberraciones cromosómicas son anormalidades que se presentan en el número o estructura de los cromosomas. En la literatura se han descrito alrededor de 4.000 enfermedades o síndromes relacionados con las anomalías congénitas que afectan alrededor del 3% de recién nacidos y son la causa más frecuente de mortalidad neonatal; adicionalmente generan discapacidad infantil y problemas psicosociales principalmente en países en vía de desarrollo. La triploidía 69 es una alteración numérica, se estima que entre el 1 al 3% de todas las concepciones humanas tendrían embriones triploides y que de éstas el 99,9% se pierden entre el primer y segundo trimestre, 15% de los fetos terminan en abortos espontáneos antes de las 20 semanas de gestación. El propósito del trabajo es describir un caso de triploidía 69 en líquido amniótico que terminó en muerte fetal. Abstract Chromosomal aberrations are abnormalities that are present in the number or structure of chromosomes; in the literature about 4,000 diseases or syndromes related to congenital anomalies have been described, affecting about 3% of newborns and are the most frequent cause of neonatal mortality; additionally generate children’s disability and psychosocial problems mainly in developing countries. The triploidy 69 is a numerical alteration, it is estimated that between 1 and 3% of all human conceptions would have triploid embryos and of these 99.9% are lost between the first and second trimester, 15% of the fetuses end in spontaneous abortions before 20 weeks of gestation. The purpose of our work is to describe a case of triploidy 69 in amniotic fluid that ended in fetal death. &nbsp

Triploidía (69 xxx): reporte de caso

Las aberraciones cromosómicas son anormalidades que se presentan en el número o estructura de los cromosomas. En la literatura se han descrito alrededor de 4.000 enfermedades o síndromes relacionados con las anomalías congénitas que afectan alrededor del 3% de recién nacidos y son la causa más frecuente de mortalidad neonatal; adicionalmente generan discapacidad infantil y problemas psicosociales principalmente en países en vía de desarrollo. La triploidía 69 es una alteración numérica, se estima que entre el 1 al 3% de todas las concepciones humanas tendrían embriones triploides y que de éstas el 99,9% se pierden entre el primer y segundo trimestre, 15% de los fetos terminan en abortos espontáneos antes de las 20 semanas de gestación. El propósito del trabajo es describir un caso de triploidía 69 en líquido amniótico que terminó en muerte fetal. Abstract Chromosomal aberrations are abnormalities that are present in the number or structure of chromosomes; in the literature about 4,000 diseases or syndromes related to congenital anomalies have been described, affecting about 3% of newborns and are the most frequent cause of neonatal mortality; additionally generate children’s disability and psychosocial problems mainly in developing countries. The triploidy 69 is a numerical alteration, it is estimated that between 1 and 3% of all human conceptions would have triploid embryos and of these 99.9% are lost between the first and second trimester, 15% of the fetuses end in spontaneous abortions before 20 weeks of gestation. The purpose of our work is to describe a case of triploidy 69 in amniotic fluid that ended in fetal death. &nbsp

Flavour-changing top decays in the aligned two-Higgs-doublet model

We perform a complete one-loop computation of the two-body flavour-changing top decays t --> ch and t --> cV (V = gamma, Z), within the aligned two-Higgs-doublet model. We evaluate the impact of the model parameters on the associated branching ratios, taking into account constraints from flavour data and measurements of the Higgs properties. Assuming that the 125 GeV Higgs corresponds to the lightest CP-even scalar of the CP-conserving aligned two-Higgs-doublet model, we find that the rates for such flavour-changing top decays lie below the expected sensitivity of the future high-luminosity phase of the LHC. Measurements of the Higgs signal strength in the di-photon channel are found to play an important role in limiting the size of the t --> ch decay rate when the charged scalar of the model is light

The role of insect pollinators in avocado production: a global review

Insect pollination increases the yield and quality of many crops and therefore, understanding the role of insect pollinators in crop production is necessary to sustainably increase yields. Avocado Persea americana benefits from insect pollination, however, a better understanding of the role of pollinators and their contribution to the production of this globally important crop is needed. In this study, we carried out a systematic literature review and meta-analysis of studies investigating the pollination ecology of avocado to answer the following questions: (a) Are there any research gaps in terms of geographic location or scientific focus? (b) What is the effect of insect pollinators on avocado pollination and production? (c) Which pollinators are the most abundant and effective and how does this vary across location? (d) How can insect pollination be improved for higher yields? (e) What are the current evidence gaps and what should be the focus of future research? Research from many regions of the globe has been published, however, results showed that there is limited information from key avocado producing countries such as Mexico and the Dominican Republic. In most studies, insects were shown to contribute greatly to pollination, fruit set and yield. Honeybees Apis mellifera were important pollinators in many regions due to their efficiency and high abundance, however, many wild pollinators also visited avocado flowers and were the most frequent visitors in over 50% of studies. This study also highlighted the effectiveness of stingless bees (Meliponini) and blow flies (Calliphoridae) as avocado pollinators although, for the majority of flower visitors, there is a lack of data on pollinator efficiency. For optimal yields, growers should ensure a sufficient abundance of pollinators in their orchards either through increasing honeybee hive density or, for a more sustainable approach, by managing wild pollinators through practices that protect or promote natural habitat