pinecone/core-2020-05-10-deduplication huggingface dataset:
Has a Higgs-flavon with a $750$ GeV mass been detected at the LHC13?

Higgs-flavon fields appear as a part of the Froggatt-Nielsen (FN) mechanism,
which attempts to explain the hierarchy of Yukawa couplings. We explore the
possibility that the 750 GeV diphoton resonance recently reported at the LHC13,
could be identified with a low-scale Higgs-flavon field $H_F$ and find the
region of the parameter space consistent with CMS and ATLAS data. It is found
that the extra vector-like fermions of the ultraviolet completion of the FN
mechanism are necessary in order to reproduce the observed signal. We consider
a standard model (SM) extension that contains two Higgs doublets (a standard
one and an inert one) and one complex FN singlet. The inert doublet includes a
stable neutral boson, which provides a viable dark matter candidate, while the
mixing of the standard doublet and the FN singlet induces flavor violation in
the Higgs sector at the tree-level. Constraints on the parameters of the model
are derived from the LHC Higgs data, which include the search for the lepton
flavor violating decay of the SM Higgs boson $h\to \bar{\mu}\tau $. It is also
found that in some region of the parameter space the model may give rise to a
large branching ratio for the $H_F \to hh$ decay, of the order of 0.1, which
could be searched for at the LHC.Comment: 18 pages, 7 Figures, includes updated files to match published
  versio
A community-based geological reconstruction of Antarctic Ice Sheet deglaciation since the Last Glacial Maximum

The Weddell Sea sector is one of the main formation sites for Antarctic Bottom Water and an outlet for about one fifth of Antarctica’s continental ice volume. Over the last few decades, studies on glacialegeological records in this sector have provided conflicting reconstructions of changes in ice-sheet extent and ice-sheet thickness since the Last Glacial Maximum (LGM at ca 23e19 calibrated kiloyears before present, cal ka BP). Terrestrial geomorphological records and exposure ages obtained from rocks in the hinterland of the Weddell Sea, ice-sheet thickness constraints from ice cores and some radiocarbon dates on offshore sediments were interpreted to indicate no significant ice thickening and locally restricted grounding-line advance at the LGM. Other marine geological and geophysical studies concluded that subglacial bedforms mapped on theWeddell Sea continental shelf, subglacial deposits and sediments over-compacted by overriding ice recovered in cores, and the few available radiocarbon ages from marine sediments are consistent with major ice-sheet advance at the LGM. Reflecting the geological interpretations, different icesheet models have reconstructed conflicting LGM ice-sheet configurations for the Weddell Sea sector. Consequently, the estimated contributions of ice-sheet build-up in the Weddell Sea sector to the LGM sealevel low-stand of w130 m vary considerably.\ud
In this paper, we summarise and review the geological records of past ice-sheet margins and past icesheet elevations in the Weddell Sea sector. We compile marine and terrestrial chronological data constraining former ice-sheet size, thereby highlighting different levels of certainty, and present two alternative scenarios of the LGM ice-sheet configuration, including time-slice reconstructions for post- LGM grounding-line retreat. Moreover, we discuss consistencies and possible reasons for inconsistencies between the various reconstructions and propose objectives for future research. The aim of our study is to provide two alternative interpretations of glacialegeological datasets on Antarctic Ice- Sheet History for the Weddell Sea sector, which can be utilised to test and improve numerical icesheet model
E-government and organizational change: Reappraising the role of ICT and bureaucracy in public service delivery

AcceptedArticleThere is a substantial literature on e-government that discusses information and communication technology (ICT) as an instrument for reducing the role of bureaucracy in government organizations. The purpose of this paper is to offer a critical discussion of this literature and to provide a complementary argument, which favors the use of ICT in the public sector to support the operations of bureaucratic organizations. Based on the findings of a case study – of the Venice municipality in Italy – the paper discusses how ICT can be used to support rather than eliminate bureaucracy. Using the concepts of e-bureaucracy and functional simplification and closure, the paper proposes evidence and support for the argument that bureaucracy should be preserved and enhanced where e-government policies are concerned. Functional simplification and closure are very valuable concepts for explaining why this should be a viable approach
Uniform electron gases. III. Low-density gases on three-dimensional spheres

By combining variational Monte Carlo (VMC) and complete-basis-set limit Hartree-Fock (HF) calculations, we have obtained near-exact correlation energies for low-density same-spin electrons on a three-dimensional sphere (3-sphere), i.e., the surface of a four-dimensional ball. In the VMC calculations, we compare the efficacies of two types of one-electron basis functions for these strongly correlated systems and analyze the energy convergence with respect to the quality of the Jastrow factor. The HF calculations employ spherical Gaussian functions (SGFs) which are the curved-space analogs of Cartesian Gaussian functions. At low densities, the electrons become relatively localized into Wigner crystals, and the natural SGF centers are found by solving the Thomson problem (i.e., the minimum-energy arrangement of n point charges) on the 3-sphere for various values of n. We have found 11 special values of n whose Thomson sites are equivalent. Three of these are the vertices of four-dimensional Platonic solids — the hyper-tetrahedron (n = 5), the hyper-octahedron (n = 8), and the 24-cell (n = 24) — and a fourth is a highly symmetric structure (n = 13) which has not previously been reported. By calculating the harmonic frequencies of the electrons around their equilibrium positions, we also find the first-order vibrational corrections to the Thomson energy
Formation and maintenance of nitrogen-fixing cell patterns in filamentous cyanobacteria

Cyanobacteria forming one-dimensional filaments are paradigmaticmodel organisms of the transition between unicellular andmulticellular living forms. Under nitrogen-limiting conditions, infilaments of the genus Anabaena, some cells differentiate into heterocysts,which lose the possibility to divide but are able to fixenvironmental nitrogen for the colony. These heterocysts form aquasiregular pattern in the filament, representing a prototype ofpatterning and morphogenesis in prokaryotes. Recent years haveseen advances in the identification of the molecular mechanism regulatingthis pattern. We use these data to build a theory on heterocystpattern formation, for which both genetic regulation and theeffects of cell division and filament growth are key components. Thetheory is based on the interplay of three generic mechanisms: localautoactivation, early long-range inhibition, and late long-range inhibition.These mechanisms can be identified with the dynamics ofhetR, patS, and hetN expression. Our theory reproduces quantitativelythe experimental dynamics of pattern formation and maintenancefor wild type and mutants. We find that hetN alone is notenough to play the role as the late inhibitory mechanism: a secondmechanism, hypothetically the products of nitrogen fixation suppliedby heterocysts, must also play a role in late long-range inhibition.The preponderance of even intervals between heterocysts arisesnaturally as a result of the interplay between the timescales of geneticregulation and cell division.We also find that a purely stochasticinitiation of the pattern, without a two-stage process, is enoughto reproduce experimental observations.Funding from the Spanish Ministry of Economy and Competitiveness through Grant PHYSDEV (FIS2012-32349) and the Ramón y Cajal Program (to S.A.)
Search for resonances decaying into top-quark pairs using fully hadronic decays in pp collisions with ATLAS at root s=7 TeV

A search for resonances produced in 7 TeV proton-proton collisions and decaying into top-quark pairs is described. In this Letter events where the top-quark decay produces two massive jets with large transverse momenta recorded with the ATLAS detector at the Large Hadron Collider are considered. Two techniques that rely on jet substructure are used to separate top-quark jets from those arising from light quarks and gluons. In addition, each massive jet is required to have evidence of an associated bottom-quark decay. The data are consistent with the Standard Model, and limits can be set on the production cross section times branching fraction of a Z' boson and a Kaluza-Klein gluon resonance. These limits exclude, at the 95% credibility level, Z' bosons with masses 0.70-1.00 TeV as well as 1.28-1.32 TeV and Kaluza-Klein gluons with masses 0.70-1.62 TeV
Narcolepsy patients have antibodies that stain distinct cell populations in rat brain and influence sleep patterns.

Narcolepsy is a chronic sleep disorder, likely with an autoimmune component. During 2009 and 2010, a link between A(H1N1)pdm09 Pandemrix vaccination and onset of narcolepsy was suggested in Scandinavia. In this study, we searched for autoantibodies related to narcolepsy using a neuroanatomical array: rat brain sections were processed for immunohistochemistry/double labeling using patient sera/cerebrospinal fluid as primary antibodies. Sera from 89 narcoleptic patients, 52 patients with other sleep-related disorders (OSRDs), and 137 healthy controls were examined. Three distinct patterns of immunoreactivity were of particular interest: pattern A, hypothalamic melanin-concentrating hormone and proopiomelanocortin but not hypocretin/orexin neurons; pattern B, GABAergic cortical interneurons; and pattern C, mainly globus pallidus neurons. Altogether, 24 of 89 (27%) narcoleptics exhibited pattern A or B or C. None of the patterns were exclusive for narcolepsy but were also detected in the OSRD group at significantly lower numbers. Also, some healthy controls exhibited these patterns. The antigen of pattern A autoantibodies was identified as the common C-terminal epitope of neuropeptide glutamic acid-isoleucine/alpha-melanocyte-stimulating hormone (NEI/alphaMSH) peptides. Passive transfer experiments on rat showed significant effects of pattern A human IgGs on rapid eye movement and slow-wave sleep time parameters in the inactive phase and EEG theta-power in the active phase. We suggest that NEI/alphaMSH autoantibodies may interfere with the fine regulation of sleep, contributing to the complex pathogenesis of narcolepsy and OSRDs. Also, patterns B and C are potentially interesting, because recent data suggest a relevance of those brain regions/neuron populations in the regulation of sleep/arousal
Uniform Boundedness and Long-Time Asymptotics for the Two-Dimensional Navier–Stokes Equations in an Infinite Cylinder

International audienceThe incompressible Navier-Stokes equations are considered in the two-dimensional strip R × [0, L], with periodic boundary conditions and no exterior forcing. If the initial velocity is bounded, it is shown that the solution remains uniformly bounded for all time, and that the vorticity distribution converges to zero as t → ∞. This implies, after a transient period, the emergence of a laminar regime in which the solution rapidly converges to a shear flow described by the one-dimensional heat equation in an appropriate Galilean frame. The approach is constructive and provides explicit estimates on the size of the solution and the lifetime of the turbulent period in terms of the initial Reynolds number
Relative Property (T) Actions and Trivial Outer Automorphism Groups

Improvement in the presentation of the replacement trick. Introduction of compressions for non-ergodic equivalence relations.International audienceWe show that every non-amenable free product of groups admits free ergodic probability measure preserving actions which have relative property (T) in the sense of S.~Popa \cite[Def. 4.1]{Pop06}. There are uncountably many such actions up to orbit equivalence and von Neumann equivalence, and they may be chosen to be conjugate to any prescribed action when restricted to the free factors. We exhibit also, for every non-amenable free product of groups, free ergodic probability measure preserving actions whose associated equivalence relation has trivial outer automorphisms group. This gives in particular the first examples of such actions for the free group on 2 generators
T Lymphocytes Orient against the Direction of Fluid Flow during LFA-1-Mediated Migration.

International audienceAs they leave the blood stream and travel to lymph nodes or sites of inflammation, T lymphocytes are captured by the endothelium and migrate along the vascular wall to permissive sites of transmigration. These processes take place under the influence of hemodynamic shear stress; therefore, we investigated how migrational speed and directionality are influenced by variations in shear stress. We examined human effector T lymphocytes on intercellular adhesion molecule 1 (ICAM-1)-coated surfaces under the influence of shear stresses from 2 to 60 dyn.cm(-2). T lymphocytes were shown to respond to shear stress application by a rapid (30 s) and fully reversible orientation of their migration against the fluid flow without a change in migration speed. Primary T lymphocytes migrating on ICAM-1 in the presence of uniformly applied SDF-1α were also found to migrate against the direction of shear flow. In sharp contrast, neutrophils migrating in the presence of uniformly applied fMLP and leukemic HSB2 T lymphocytes migrating on ICAM-1 alone oriented their migration downstream, with the direction of fluid flow. Our findings suggest that, in addition to biochemical cues, shear stress is a contributing factor to leukocyte migration directionality
Cosmological model dependence of the galaxy luminosity          function: far-infrared results in the Lemaître-Tolman-Bondi model

International audienceAims. This is the first paper of a series aiming at investigating galaxy          formation and evolution in the giant-void class of the Lemaître-Tolman-Bondi (LTB) models          that best fits current cosmological observations. Here we investigate the luminosity          function (LF) methodology, and how its estimates would be affected by a change on the          cosmological model assumed in its computation. Are the current observational constraints          on the allowed cosmology enough to yield robust LF results?Methods. We used the far-infrared source catalogues built on the          observations performed with the Herschel/PACS instrument and selected as          part of the PACS evolutionary probe (PEP) survey. Schechter profiles were obtained in          redshift bins up to z ≈ 4, assuming comoving volumes in both the standard          model, that is, the Friedmann-Lemaître-Robertson-Walker metric with a perfect fluid          energy-momentum tensor, and non-homogeneous LTB dust models, parametrized to fit the          current combination of results stemming from the observations of supernovae Ia, the cosmic          microwave background, and baryonic acoustic oscillations.Results. We find that the luminosity functions computed assuming both          the standard model and LTB void models show in general good agreement. However, the          faint-end slope in the void models shows a significant departure from the standard model          up to redshift 0.4. We demonstrate that this result is not artificially caused by the used          LF estimator which turns out to be robust under the differences in matter-energy density          profiles of the models.Conclusions. The differences found in the LF slopes at the faint end are          due to variation in the luminosities of the sources that depend on the geometrical part of          the model. It follows that either the standard model is over-estimating the number density          of faint sources or the void models are under-estimating it
Measurement of the doubly-polarized He3→(γ→,n)pp reaction at 16.5 MeV and its implications for the GDH sum rule

We report new measurements of the double-polarized photodisintegration of 3He at an incident photon energy of 16.5 MeV, carried out at the High Intensity γ-ray Source (HIγS) facility located at Triangle Universities Nuclear Laboratory (TUNL). The spin-dependent double-differential cross sections and the contribution from the three-body channel to the Gerasimov–Drell–Hearn (GDH) integrand were extracted and compared with the state-of-the-art three-body calculations. The calculations, which include the Coulomb interaction and are in good agreement with the results of previous measurements at 12.8 and 14.7 MeV, deviate from the new cross section results at 16.5 MeV. The GDH integrand was found to be about one standard deviation larger than the maximum value predicted by the theories.U.S. DOE/DE-FG02-03ER41-231U.S. DOE/DE-FG02-03ER41-033U.S. DOE/DE-FG02-03ER41-041Duke UniversityPNSC/DEC-2013/10/M/ST2/0042
What Makes SMEs more Likely to Collaborate? Analysing the Role of Regional Innovation Policy

The last twenty years have witnessed the diffusion of regional innovation policies supporting networks of innovators. The underlying aim of these policies is to encourage firms, particularly SMEs, to undertake collaborations with organisations possessing complementary knowledge. Focusing on a set of SMEs that have participated, over time, in several innovation networks funded by the same regional government, the paper investigates how their relationships have evolved with respect to the following aspects: (i) reiteration of pre-existing relationships as opposed to experimentation of new relationships; (ii) collaboration with organisations possessing complementary rather than similar knowledge and competencies; (iii) creation of local relationships rather than experimentation of extra-local collaborations; (iv) reliance upon intermediaries to connect with other organisations. Our findings reveal that the involvement in these policy-supported networks changed the firms’ relational patterns, leading them to collaborate with a wider variety of agents than those with whom they were linked before the policies. Sectoral heterogeneity had a negative effect on the probability to collaborate, while, not surprisingly, co-localisation increased the likelihood to collaborate. Mutual involvement with intermediaries also had a positive effect. However, in the case of firm-to-university relationships only specialized intermediaries such as innovation centres were likely to perform a positive role and, therefore, encourage networking
Comparing direct and imagined intergroup contact among children: Effects on outgroup stereotypes and helping intentions

We conducted an experimental intervention aimed at comparing the effectiveness of directand imagined intergroup contact. Italian elementary school children took part in a three-week intervention with dependent variables assessed one week after the last interventionsession. Results revealed that direct and imagined intergroup contact, compared to controlconditions of direct and imagined intragroup contact, had an additive impact when it cameto reducing negative stereotypes of immigrants and fostering future helping intentionstoward this group. The theoretical and practical implications of the findings are discussed
International comparisons of behavioral and emotional problems in preschool children: parents’ reports from 24 societies

International comparisons were conducted of preschool children’s behavioral and
emotional problems as reported on the Child Behavior Checklist for Ages 1½–5 by parents
in 24 societies (N¼19,850). Item ratings were aggregated into scores on syndromes; Diagnostic
and Statistical Manual of Mental Disorders–oriented scales; a Stress Problems scale;
and Internalizing, Externalizing, and Total Problems scales. Effect sizes for scale score differences
among the 24 societies ranged from small to medium (3–12%). Although societies
differed greatly in language, culture, and other characteristics, Total Problems scores for
18 of the 24 societies were within 7.1 points of the omnicultural mean of 33.3 (on a scale of
0–198). Gender and age differences, as well as gender and age interactions with society,
were all very small (effect sizes<1%). Across all pairs of societies, correlations between
mean item ratings averaged .78, and correlations between internal consistency alphas
for the scales averaged .92, indicating that the rank orders of mean item ratings and internal
consistencies of scales were very similar across diverse societies
Search for light top squark pair production in final states with leptons and b− jets with the ATLAS detector in s√=7 TeV proton-proton collisions

The results of a search for pair production of light top squarks are presented, using 4.7 fb−1 of View the MathML source proton–proton collisions collected with the ATLAS detector at the Large Hadron Collider. This search targets top squarks with masses similar to, or lighter than, the top quark mass. Final states containing exclusively one or two leptons (e,μ), large missing transverse momentum, light-flavour jets and b  -jets are used to reconstruct the top squark pair system. Event-based mass scale variables are used to separate the signal from a large View the MathML source background. No excess over the Standard Model expectations is found. The results are interpreted in the framework of the Minimal Supersymmetric Standard Model, assuming the top squark decays exclusively to a chargino and a b-quark, while requiring different mass relationships between the Supersymmetric particles in the decay chain. Light top squarks with masses between 123–167 GeV are excluded for neutralino masses around 55 GeV.We acknowledge the support of ANPCyT, Argentina; YerPhI, Armenia; ARC, Australia; BMWF, Austria; ANAS, Azerbaijan; SSTC, Belarus; CNPq and FAPESP, Brazil; NSERC, NRC and CFI, Canada; CERN; CONICYT, Chile; CAS, MOST and NSFC, China; COLCIENCIAS, Colombia; MSMT CR, MPO CR and VSC CR, Czech Republic; DNRF, DNSRC and Lundbeck Foundation, Denmark; EPLANET and ERC, European Union; IN2P3-CNRS, CEA-DSM/IRFU, France; GNAS, Georgia; BMBF, DFG, HGF, MPG and AvH Foundation, Germany; GSRT, Greece; ISF, MINERVA, GIF, DIP and Benoziyo Center, Israel; INFN, Italy; MEXT and JSPS, Japan; CNRST, Morocco; FOM and NWO, Netherlands; RCN, Norway; MNiSW, Poland; GRICES and FCT, Portugal; MERYS (MECTS), Romania; MES of Russia and ROSATOM, Russian Federation; JINR; MSTD, Serbia; MSSR, Slovakia; ARRS and MVZT, Slovenia; DST/NRF, South Africa; MICINN, Spain; SRC and Wallenberg Foundation, Sweden; SER, SNSF and Cantons of Bern and Geneva, Switzerland; NSC, Taiwan; TAEK, Turkey; STFC, the Royal Society and Leverhulme Trust, United Kingdom; DOE and NSF, United States
TET enzymes and DNA hydroxymethylation in neural development and function : how critical are they?

Epigenetic modifications of the genome play important roles in controlling gene transcription thus regulating several molecular and cellular processes. A novel epigenetic modification - 5-hydroxymethylcytosine (5hmC) - has been recently described and attracted a lot of attention due to its possible involvement in the active DNA demethylation mechanism. TET enzymes are dioxygenases capable of oxidizing the methyl group of 5-methylcytosines (5mC) and thus converting 5mC into 5hmC. Although most of the work on TET enzymes and 5hmC has been carried out in embryonic stem (ES) cells, the highest levels of 5hmC occur in the brain and in neurons, pointing to a role for this epigenetic modification in the control of neuronal differentiation, neural plasticity and brain functions. Here we review the most recent advances on the role of TET enzymes and DNA hydroxymethylation in neuronal differentiation and function.FCT -Fundação para a Ciência e a Tecnologia (PTDC/BIA-BCM/121276/2010