Wrong sign and symmetric limits and non-decoupling in 2HDMs

We analyse the possibility that, in two Higgs doublet models, one or more of the Higgs couplings to fermions or to gauge bosons change sign, relative to the respective Higgs Standard Model couplings. Possible sign changes in the coupling of a neutral scalar to charged ones are also discussed. These \textit{wrong signs} can have important physical consequences, manifesting themselves in Higgs production via gluon fusion or Higgs decay into two gluons or into two photons. We consider all possible wrong sign scenarios, and also the \textit{symmetric limit}, in all possible Yukawa implementations of the two Higgs doublet model, in two different possibilities: the observed Higgs boson is the lightest CP-even scalar, or the heaviest one. We also analyse thoroughly the impact of the currently available LHC data on such scenarios. With all 8 TeV data analysed, all wrong sign scenarios are allowed in all Yukawa types, even at the 1$\sigma$ level. However, we will show that B-physics constraints are crucial in excluding the possibility of wrong sign scenarios in the case where $\tan \beta$ is below 1. We will also discuss the future prospects for probing the wrong sign scenarios at the next LHC run. Finally we will present a scenario where the alignment limit could be excluded due to non-decoupling in the case where the heavy CP-even Higgs is the one discovered at the LHC.Comment: 20 pages, 15 figure

El mercado central de Santiago: Antes de su embarque a Chile

La fantasía de la globalización ronda Chile desde la Colonia. El edificio del Mercado Central de Santiago, cuya estructura fue diseñada y construida en Gran Bretaña, hoy es objeto de miradas anestesiadas; sin embargo, en la época de su construcción fue considerado en Europa como caso ejemplar de la arquitectura metálica de ultramar

Algumas Aplicações do Software Geogebra ao Ensino da Geometria Analítica

Ao lecionar a geometria analítica nas turmas do 3ª ano do Ensino Médio, sempre observava que a maioria dos alunos não se lembrava das principais propriedades da geometria plana, e tinha muita dificuldade em fazer a analogia entre esta e o plano cartesiano. Visando a melhorar esse aprendizado, pensei em uma proposta de intervenção que fizesse o aluno trabalhar, de uma forma mais prazerosa, esse conteúdo. Com o advento da computação e do software GeoGebra, tentei elaborar aulas práticas, em duplas ou individual, para que eles pudessem revisar e aprofundar os principais conceitos da geometria analítica plana. Esse trabalho foi então elaborado de forma a fazer com que os alunos pudessem visualizar e aprofundar os conhecimentos previamente estudados no Ensino Fundamental e nas séries iniciais do Ensino Médio, visando a uma revisão mais aprofundada. Ele foi planejado com questões de modo a que o aluno analisasse certas propriedades previamente escolhidas, discutisse os resultados obtidos, a partir de algumas indagações, elaborasse argumentos que comprovassem as observações obtidas e descrevesse, de forma clara e sucinta, as relações e condições para explicar os conceitos e propriedades estudadas

The CP-conserving 2HDM after the 8 TeV run

We confront the most common CP-conserving 2HDM with the LHC data analysed so far while taking into account all previously available experimental data. A special allowed corner of the parameter space is analysed - the so-called wrong-sign scenario where the Higgs coupling to down-type quarks changes sign relative to the Standard Model while the coupling to the massive vector bosons does not.Comment: 6 pages, 2 figures, to appear in the proceedings of the 22nd International Workshop on Deep-Inelastic Scattering and Related Subjects (DIS 2014), 28 April - 2 May 2014 Warsaw (Poland

The Wrong Sign limit in the 2HDM

A sign change in the Higgs couplings to fermions and massive gauge bosons is still allowed in the framework of two-Higgs doublet models (2HDM). In this work we discuss the possible sign changes in the Higgs couplings to fermions and gauge bosons, while reviewing the status of the 8-parameter CP-conserving 2HDM after the Large Hadron Collider 8 TeV run.Comment: 6 pages, 3 figures. Proceedings of the Second Annual Conference on Large Hadron Collider Physics, Columbia University, New York, U.S.A, June 2-7, 2014. arXiv admin note: text overlap with arXiv:1407.439

Hybrid GMR Sensor Detecting 950 pT/sqrt(Hz) at 1 Hz and Room Temperature.

Advances in the magnetic sensing technology have been driven by the increasing demand for the capability of measuring ultrasensitive magnetic fields. Among other emerging applications, the detection of magnetic fields in the picotesla range is crucial for biomedical applications. In this work Picosense reports a millimeter-scale, low-power hybrid magnetoresistive-piezoelectric magnetometer with subnanotesla sensitivity at low frequency. Through an innovative noise-cancelation mechanism, the 1/f noise in the MR sensors is surpassed by the mechanical modulation of the external magnetic fields in the high frequency regime. A modulation efficiency of 13% was obtained enabling a final device's sensitivity of ~950 pT/Hz1/2 at 1 Hz. This hybrid device proved to be capable of measuring biomagnetic signals generated in the heart in an unshielded environment. This result paves the way for the development of a portable, contactless, low-cost and low-power magnetocardiography device