Present Bounds on New Neutral Vector Resonances from Electroweak Gauge Boson Pair Production at the LHC

Several extensions of the Standard Model predict the existence of new neutral spin-1 resonances associated to the electroweak symmetry breaking sector. Using the data from ATLAS (with integrated luminosity of L=1.02 fb^{-1}) and CMS (with integrated luminosity of L=1.55 fb^{-1}) on the production of W+W- pairs through the process pp -> l^+ l^{\prime -} \sla{E}_T, we place model independent bounds on these new vector resonances masses, couplings and widths. Our analyses show that the present data excludes new neutral vector resonances with masses up to 1-2.3 TeV depending on their couplings and widths. We also demonstrate how to extend our analysis framework to different models working a specific example.Comment: 10 pages, 6 figure

Constraining anomalous Higgs interactions

The recently announced Higgs discovery marks the dawn of the direct probing of the electroweak symmetry breaking sector. Sorting out the dynamics responsible for electroweak symmetry breaking now requires probing the Higgs interactions and searching for additional states connected to this sector. In this work we analyze the constraints on Higgs couplings to the standard model gauge bosons using the available data from Tevatron and LHC. We work in a model--independent framework expressing the departure of the Higgs couplings to gauge bosons by dimension--six operators. This allows for independent modifications of its couplings to gluons, photons and weak gauge bosons while still preserving the Standard Model (SM) gauge invariance. Our results indicate that best overall agreement with data is obtained if the cross section of Higgs production via gluon fusion is suppressed with respect to its SM value and the Higgs branching ratio into two photons is enhanced, while keeping the production and decays associated to couplings to weak gauge bosons close to their SM prediction.Comment: v3: Added acknowledgment to FP7 ITN INVISIBLES (Marie Curie Actions PITN-GA-2011-289442). Nothing else changed with respect to v

CP violation with a dynamical Higgs

We determine the complete set of independent gauge and gauge-Higgs CP-odd effective operators for the generic case of a dynamical Higgs, up to four derivatives in the chiral expansion. The relation with the linear basis of dimension six CP-odd operators is clarified. Phenomenological applications include bounds inferred from electric dipole moment limits, and from present and future collider data on triple gauge coupling measurements and Higgs signals.Comment: 41 pages, 3 figures; V2: citations added, typos corrected, version published on JHE

Pénfigo vulgar en un perro

Se describe un caso de pénfigo vulgar en un perro Pastor alemán, macho, de 8 años. El examen físico mostró lesiones eritematosas, vesiculares y ulcerativas en la cavidad oral, en diversas zonas de la piel y en las uniones cutáneomucosas de la nariz, del prepucio y del ano. A la vista del cuadro clínico, del estudio histopatológico y del test de inmunofluorescencia directa se estableció un diagnóstico de pénfigo vulgar. El tratamiento se basó en la administración oral de prednisona, azatioprina, amoxicilina-ácido clavulánico y vitamina E. Al cabo de tres meses las lesiones remitieron completamente. En la actualidad el animal se encuentra clínicamente controlado con prednisona a una dosis de mantenimiento de 0,5 mg/kg/2 días.A case of pemphigus vulgaris is described in an 8 year oId, male German Shepherd. Physical examination revealed erythematous, vesicular and ulcerative lesions in the mouth, in different areas of the skin and in the cutaneous-mucosal junctions of the nose, prepuce and anus. Based upon clinical findings, histopathological study, and dírect immunofluorescent test a diagnosis of pemphigus vulgaris was established. Treatment was based on oral administration of prednisone, azathioprine, amoxycillin-clavulanic acid and vitamin E. Complete remission was observed at three months. Presently the animal is clinically controlled with prednisone at a maintenance dose of 0,5 mg/kg on alternate days

Simple metal-free oxidative cleavage of 1,2-diols

Cleavage of 1,2-diols is easily carried out under mild conditions with the Oxone/KBr (or Oxone/NaCl) method in either acetonitrile/water or tert-butanol/water medium at room temperature. This procedure is highly efficient for the cleavage of dihydroxyfatty esters and acids. The reaction takes place through a double oxidation of the 1,2-diol, leading to the 1,2-diketone that undergoes a Baeyer-Villiger oxidation, with a final hydrolysis of the generated anhydride. The application to other diols, including simple internal and terminal diols, is also possible, but the nature of the diol substrate conditions the optimal halide/solvent system, given that important differences in reactivity are observed. These differences are ascribed to the change in the rate limiting step depending on the substrate/halide/solvent combinatio

Synthesis of hydroxyfatty esters by sequential epoxidation-hydrogenolysis: Solvent effects

The tandem/sequential combination of epoxidation and hydrogenolysis for unsaturated fatty esters is not straightforward, due to incompatibility problems with the impurities present or generated in the used solvents. The chlorinated impurities in alpha, alpha, alpha-trifluorotoluene leads to the formation of important amounts of chlorohydrins by HCl formation in the hydrogenolysis step. The use of trifluoroethanol (TFE) in the epoxidation step produces trifluoroacetic acid traces by oxidation, responsible for the opening of the epoxide with water and TFE. The solvent of choice was finally isobutyl acetate, which gathers the required physicochemical properties, with 85 % yield of hydroxystearates from methyl oleate in a sequential process

Catalytic hydrolysis of epoxyfatty esters with solid sulfonic acids

Four sulfonic resins are able to promote the hydrolysis of several epoxyfatty esters becoming a very interesting strategy to obtain polyols from epoxyfatty derivatives. The choice of the aqueous solvent and temperature is critical to improve the accessibility of reagents to the acidic catalytic sites. Tert-butanol/water mixture as solvent at 80 °C allows to obtain good results with all resins. The recovery of the heterogeneous catalyst during at least 11 reaction cycles avoids the drawbacks of the homogeneous ones including corrosion problems. In addition, this procedure can be applied to several epoxyfatty esters with different chain size, stereochemistry of the epoxide or with additional functionalities, obtaining good yields of structurally different polyols

Complejo granuloma eosinofílico

El complejo granuloma eosinofílico agrupa tres entidades clínico/histológicas denominadas granuloma colagenolítico, placa eosinofílica y úlcera indolente. En el presente artículo se describe su etiología y sus aspectos clínicos y terapéuticos.The eosinophilic granuloma complex is comprised of three clinical/histological entities: collagenolytic granuloma, eosinophilic plaque and indolent ulcer. In this article, its etiology, clinical aspects and therapy are discussed