Fast and slow light in zig-zag microring resonator chains

We analyze fast and slow light transmission in a zig-zag microring resonator chain. This novel device permits the operation in both regimes. In the superluminal case, a new ubiquitous light transmission effect is found whereby the input optical pulse is reproduced in an almost simultaneous manner at the various system outputs. When the input carrier is tuned to a different frequency, the system permits to slow down the propagating optical signal. Between these two extreme cases, the relative delay can be tuned within a broad range

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

The Higgs Legacy of the LHC Run I

Based on Run I data we present a comprehensive analysis of Higgs couplings. For the first time this SFitter analysis includes independent tests of the Higgs-gluon and top Yukawa couplings, Higgs decays to invisible particles, and off-shell Higgs measurements. The observed Higgs boson is fully consistent with the Standard Model, both in terms of coupling modifications and effective field theory. Based only on Higgs total rates the results using both approaches are essentially equivalent, with the exception of strong correlations in the parameter space induced by effective operators. These correlations can be controlled through additional experimental input, namely kinematic distributions. Including kinematic distributions the typical Run I reach for weakly interacting new physics now reaches 300 to 500 GeV.Comment: 29 pages, 15 figure

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