The electroweak phase transition in two-Higgs-doublet models and implications for LHC searches

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Maximally Localized States in Quantum Mechanics with a Modified Commutation Relation to All Orders

We construct the states of maximal localization taking into account a modification of the commutation relation between position and momentum operators to all orders of the minimum length parameter. To first order, the algebra we use reproduces the one proposed by Kempft, Mangano and Mann. It is emphasized that a minimal length acts as a natural regulator for the theory, thus eliminating the otherwise ever appearing infinities. So, we use our results to calculate the first correction to the Casimir Effect due to the minimal length. We also discuss some of the physical consequences of the existence of a minimal length, culminating in a proposal to reformulate the very concept of "position measurement"

Física de Partículas no ensino médio Parte II: Física Nuclear

Apresentamos a segunda parte de uma série de artigos que propõe uma nova sequência didática sobre Física de Partículas para o ensino médio. O tema do presente trabalho é a Física Nuclear. O objetivo principal da sequência é abordar o assunto de modo a fomentar a alfabetização científica dos(as) estudantes, em uma perspectiva que relaciona Ciência, Tecnologia, Sociedade e Meio Ambiente (CTSA). Avaliamos as potencialidades e a efetividade do material aqui proposto, aliado a uma postura dialógica docente, a partir da análise de indicadores de alfabetização científica e de engajamento dos(as) estudantes durante as intervenções realizadas em uma escola pública estadual do Espírito Santo

Baryogenesis and gravitational waves in two-Higgs-doublet models

The recent order-of-magnitude improvement of the electron-EDM bound obtained by the ACME collaboration typically imposes tight constraints on BSM sources of CP violation, thus casting doubts on whether certain models could still provide a viable explanation for the baryon asymmetry of the Universe via electroweak baryogenesis. In this work we explore this issue in the context of two-Higgs-doublet models. We show not only that the baryon asymmetry can still be explained in this scenario, but also that the electroweak phase transition could leave a gravitational wave signature detectable in near-future space-based interferometers such as eLISA

Baryogenesis and Gravitational Waves in two-Higgs-doublet models

We show that simple Two Higgs Doublet models still provide a viable explanation for the matter-antimatter asymmetry of the Universe via electroweak baryogenesis, even after taking into account the recent order-of-magnitude improvement on the electron-EDM experimental bound by the ACME Collaboration. Moreover we show that, in the region of parameter space where baryogenesis is possible, the gravitational wave spectrum generated at the end of the electroweak phase transition is within the sensitivity reach of the future space-based interferometer LISA

Hierarchical vs Degenerate 2HDM: The LHC Run 1 Legacy at the Onset of Run 2

Current discussions of the allowed two-Higgs-doublet model (2HDM) parameter space after LHC Run 1 and the prospects for Run 2 are commonly phrased in the context of a quasi-degenerate spectrum for the new scalars. Here we discuss the generic situation of a 2HDM with a non-degenerate spectrum for the new scalars. This is highly motivated from a cosmological perspective since it naturally leads to a strongly first order electroweak phase transition that could explain the matter-antimatter asymmetry in the Universe. While constraints from measurements of Higgs signal strengths do not change, those from searches of new scalar states get modified dramatically once a non-degenerate spectrum is considered