6,774 research outputs found
Diphoton decay for a GeV scalar boson in an model
In the context of a nonuniversal and anomaly free extension of the
standard model, we examine the decay of a GeV scalar singlet state,
, as a possible explanation of the observed diphoton excess
announced by the ATLAS and CMS collaborations at CERN-LHC collider. One-loop
decay to photons is allowed through three heavy singlet quarks and one charged
Higgs boson into the loop. We obtain, for different width approximations and
for masses of the exotic singlet quarks in the region GeV, a
production cross section compatible
with ATLAS and CMS collaborations data. We also include another scalar singlet,
, as a dark matter candidate that may couple with the 750 GeV scalar at
tree level with production cross sections in agreement with ATLAS and CMS.Comment: 5 figures, discussion extended, 2 new figure
Diphoton decay for a 750 GeV scalar boson in a model
We propose a new GUT model free from anomalies, with
a 750 GeV scalar candidate which can decay into two photons, compatible with
the recent diphoton signal reported by ATLAS and CMS collaborations. This model
gives masses to all fermions and may explain the 750GeV signal through one loop
decays to with charged vector and charged Higgs bosons, as well
as up- and electron-like exotic particles that arise naturally from the
condition of cancellation of anomalies of the group. We
obtain, for different width approximations, allowed mass regions from 900 GeV
to 3 TeV for the exotic up-like quark, in agreement with ATLAS and CMS
collaborations data.Comment: 4 figures, discussion extended, 1 new figur
Beyond with the general 2HDM-III for
We review the parameter regions allowed by measurements of
and by a theoretical limit on in terms of generic scalar and pseudoscalar new physics
couplings, and . We then use these regions as constraints to predict
the ranges for additional observables in including the
differential decay distributions ; the ratios
and ; and the tau-lepton
polarisation in , with emphasis on the CP violating
normal polarisation. Finally we map the allowed regions in and into
the parameters of four versions of the Yukawa couplings of the general 2HDM-III
model. We find that the model is still viable but could be ruled out by a
confirmation of a large .Comment: 27 pages, 11 figures, major changes with new analysis and plot
Bullying and gender violence at school: analysis of teacher perception
Nowadays gender violence and bullying continue to be considered a matter of great concern to society. This study analyses the teachers'' perceptions of these two social problems in the educational context. The interventions that are carried out from the school to prevent and respond to these behaviours are studied. From a methodological point of view, the study responds to the paradigm of qualitative research. We interviewed fifteen teachers of Early Childhood Education, Primary Education and Secondary Education of the Spanish educational system. The information collected indicates that teachers advocate a necessary reinforcement of emotional competencies and social skills from schools. In addition, they express their dissatisfaction due to the insufficient strategies applied from the school to respond to these violent behaviours. These results support any initiative that aims to train teachers to prevent possible cases of bullying or gender violence
Scalar coupling limits and diphoton Higgs decay from LHC in an model with scalar dark matter
In the context of an nonuniversal extension of the standard model
free from anomalies, we introduce a complex scalar singlet candidate to be dark
matter. In addition, an extra scalar doublet and a heavy scalar singlet are
required to provide masses to all fermions and to break spontaneously the
symmetries. From unitarity and stability of the Higgs potential, we find the
full set of bounds and order relations for the scalar coupling constants. Using
recent data from the CERN-LHC collider, we study the signal strenght of the
diphoton Higgs decay , which imposes very stringent bounds
to the scalar couplings and other scalar parameters. We obtain constraints in
different scenarios of the space of parameters, where decays into dark matter
may or may not contribute according to the mass of the scalar dark matter
candidate. By assuming that the lightest scalar boson of the model corresponds
to the observed Higgs boson, we evaluate deviations from the SM of the
trilineal Higgs self-coupling. The conditions from unitarity, stability and
Higgs diphoton decay data allow trilineal deviations in the range .Comment: Additional figures and analysis in new versio
Closure of a large lumbosacral myelomeningocele post operative defect with a human cadaveric split-thickness skin graft: a case report
Spina bifida is the most common birth defect of the central nervous system that is compatible with life, and myelomeningocele represents its most frequent form. Congenital myelomeningocele (CMM) has a worldwide incidence of 0.5 to 0.8 per 1,000 live newborns. CMM is a complex condition resulting from incomplete closure of the neural tube, mainly in the lumbosacral region. The objective of the surgical repair of the CMM is the reconstruction of all the tissue layers of the defect, avoiding possible postoperative complications. The aim of this case review is to present a re-epithelialization closure in a patient with a large CMM defect in who primary hermetic closure was not possible because there was too much tension at the edges of the defect. Therefore, human cadaveric split-thickness skin grafts were placed over the dura mater and the aponeurotic layer, covering the entire defect and an adequate healing and completely closure of the defect were observed in eight weeks. The surgical management of large meningomyelocele defects represents a major challenge and no single protocol exists for its reconstruction. The repair of an MMC defect should be performed during the first 72 hours after birth. After neurosurgical closure of the neural tube and dura, the myelomeningocele defect requires good quality skin and subcutaneous tissue with minimal wound tension for stable coverage. Human cadaveric skin grafts are considered a useful technique for temporary wound coverage because they lead to a more natural healing environment, possess ideal properties, and provide a physiological barrier that reduces microbiological contamination, in addition, it acts as a bridge to adhere to and to seal wound beds
Changes in Anxiety and Depression Traits Induced by Energy Restriction: Predictive Value of the Baseline Status
Current evidence proposes diet quality as a modifiable risk factor for mental or emotional impairments. However, additional studies are required to investigate the effect of dietary patterns and weight loss on improving psychological symptoms. The aim of this investigation was to evaluate the effect of energy-restriction, prescribed to overweight and obese participants, on anxiety and depression symptoms, as well as the potential predictive value of some baseline psychological features on weight loss. Overweight and obese participants (n = 305) were randomly assigned for 16 weeks to two hypocaloric diets with different macronutrient distribution: a moderately high-protein (MHP) diet and a low-fat (LF) diet. Anthropometrical, clinical, psychological, and lifestyle characteristics were assessed at baseline and at the end of the intervention. The nutritional intervention evidenced that weight loss has a beneficial effect on trait anxiety score in women (β = 0.24, p = 0.03), depression score in all population (β = 0.15, p = 0.02), particularly in women (β = 0.22, p = 0.03) and in subjects who followed the LF diet (β = 0.22, p = 0.04). Moreover, weight loss could be predicted by anxiety status at baseline, mainly in women and in those who were prescribed a LF diet. This trial suggests that weight loss triggers an improvement in psychological traits, and that anxiety symptoms could predict those volunteers that benefit most from a balanced calorie-restricted intervention, which will contribute to individualized precision nutrition
POEMMA: Probe Of Extreme Multi-Messenger Astrophysics
The Probe Of Extreme Multi-Messenger Astrophysics (POEMMA) mission is being
designed to establish charged-particle astronomy with ultra-high energy cosmic
rays (UHECRs) and to observe cosmogenic tau neutrinos (CTNs). The study of
UHECRs and CTNs from space will yield orders-of-magnitude increase in
statistics of observed UHECRs at the highest energies, and the observation of
the cosmogenic flux of neutrinos for a range of UHECR models. These
observations should solve the long-standing puzzle of the origin of the highest
energy particles ever observed, providing a new window onto the most energetic
environments and events in the Universe, while studying particle interactions
well beyond accelerator energies. The discovery of CTNs will help solve the
puzzle of the origin of UHECRs and begin a new field of Astroparticle Physics
with the study of neutrino properties at ultra-high energies.Comment: 8 pages, in the Proceedings of the 35th International Cosmic Ray
Conference, ICRC217, Busan, Kore
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