Tipificación estructural y rentabilidad de explotaciones ovinas de carne.

El sector ovino de carne está experimentando un fuerte retroceso en España y en la Unión Europea. Se trata de un tipo de ganadería que desempeña un importante papel en zonas desfavorecidas por su contribución a la sostenibilidad económica, social y medioambiental, siendo importante garantizar su viabilidad económica. El objetivo genérico del presente trabajo ha sido analizar las posibles relaciones entre los resultados económicos de una muestra de explotaciones de ovino de carne ubicadas en Aragón (España) y determinados indicadores estructurales. Previamente se realizó una tipificación para estudiar su variabilidad. La muestra la componen 126 ganaderías aragonesas de ovino de carne. Se utilizan las medias de las variables durante un período que oscila entre 5 y 24 años dentro del periodo 1993-2016. Se realizó un análisis factorial sobre diez variables estructurales y se identificaron cuatro factores a partir de los cuáles se obtuvieron dos grupos significativamente diferentes en cuanto a sus características estructurales. Se eligió la renta disponible por unidad de trabajo como indicador del resultado económico de las explotaciones, y se calculó teniendo en cuenta o no la retribución de la mano de obra familiar. Mediante una regresión lineal múltiple se estableció su dependencia con las variables estructurales previamente analizadas. Se puede concluir que la optimización del número de ovejas por unidad de mano de obra y por hectárea de la superficie agrícola útil, son aspectos a tener en cuenta a la hora de mejorar la rentabilidad y la viabilidad de las explotaciones ovinas de carne. The sheep meat sector is experiencing a strong recoil in Spain and in the European Union. It is a type of livestock that plays an important role in disadvantaged areas for its contribution to economic, social and environmental sustainability, being important to ensure its economic viability. The generic objective of this work has been to analyze the possible relationship between the economic results of a sample of sheep meat farms located in Aragon (Spain) and certain structural indicators. Previously a typification was done to study their variability. The sample is made up of 126 Aragonese meat sheep farms. The variables’ means are used during a period that varies between 5 and 24 years within the 1993-2016 period. A factor analysis was performed on ten structural variables and four factors were identified from which two significantly different groups of farms were obtained in terms of their structural characteristics. The gross margin per total labor unit was chosen as an indicator of the economic result of farms, and was calculated considering or not the remuneration of family labor. By means of a multiple linear regression the dependence of this economic result on structural variables previously analyzed was established. It can be concluded that the optimization of the number of ewes per total labor unit and per hectare of the used agricultural area, are aspects to be considered when improving the profitability and viability of sheep meat farms

Studies of new Higgs boson interactions through nonresonant HH production in the b¯bγγ fnal state in pp collisions at √s = 13 TeV with the ATLAS detector

A search for nonresonant Higgs boson pair production in the b ¯bγγ fnal state is performed using 140 fb−1 of proton-proton collisions at a centre-of-mass energy of 13 TeV recorded by the ATLAS detector at the CERN Large Hadron Collider. This analysis supersedes and expands upon the previous nonresonant ATLAS results in this fnal state based on the same data sample. The analysis strategy is optimised to probe anomalous values not only of the Higgs (H) boson self-coupling modifer κλ but also of the quartic HHV V (V = W, Z) coupling modifer κ2V . No signifcant excess above the expected background from Standard Model processes is observed. An observed upper limit µHH < 4.0 is set at 95% confdence level on the Higgs boson pair production cross-section normalised to its Standard Model prediction. The 95% confdence intervals for the coupling modifers are −1.4 < κλ < 6.9 and −0.5 < κ2V < 2.7, assuming all other Higgs boson couplings except the one under study are fxed to the Standard Model predictions. The results are interpreted in the Standard Model efective feld theory and Higgs efective feld theory frameworks in terms of constraints on the couplings of anomalous Higgs boson (self-)interactions

Measurement of the H → γ γ and H → ZZ∗ → 4 cross-sections in pp collisions at √s = 13.6 TeV with the ATLAS detector

The inclusive Higgs boson production cross section is measured in the di-photon and the Z Z∗ → 4 decay channels using 31.4 and 29.0 fb−1 of pp collision data respectively, collected with the ATLAS detector at a centre of-mass energy of √s = 13.6 TeV. To reduce the model dependence, the measurement in each channel is restricted to a particle-level phase space that closely matches the chan nel’s detector-level kinematic selection, and it is corrected for detector effects. These measured fiducial cross-sections are σfid,γ γ = 76+14 −13 fb, and σfid,4 = 2.80 ± 0.74 fb, in agreement with the corresponding Standard Model predic tions of 67.6±3.7 fb and 3.67±0.19 fb. Assuming Standard Model acceptances and branching fractions for the two chan nels, the fiducial measurements are extrapolated to the full phase space yielding total cross-sections of σ (pp → H) = 67+12 −11 pb and 46±12 pb at 13.6 TeV from the di-photon and Z Z∗ → 4 measurements respectively. The two measure ments are combined into a total cross-section measurement of σ (pp → H) = 58.2±8.7 pb, to be compared with the Stan dard Model prediction of σ (pp → H)SM = 59.9 ± 2.6 p