h→Zγh \rightarrow Z \gamma in the complex two Higgs doublet model

The latest LHC data confirmed the existence of a Higgs-like particle and made interesting measurements on its decays into $\gamma \gamma$, $Z Z^\ast$, $W W^\ast$, $\tau^+ \tau^-$, and $b \bar{b}$. It is expected that a decay into $Z \gamma$ might be measured at the next LHC round, for which there already exists an upper bound. The Higgs-like particle could be a mixture of scalar with a relatively large component of pseudoscalar. We compute the decay of such a mixed state into $Z \gamma$, and we study its properties in the context of the complex two Higgs doublet model, analysing the effect of the current measurements on the four versions of this model. We show that a measurement of the $h \rightarrow Z \gamma$ rate at a level consistent with the SM can be used to place interesting constraints on the pseudoscalar component. We also comment on the issue of a wrong sign Yukawa coupling for the bottom in Type II models.Comment: 31 pages, 15 figure

A reappraisal of the wrong-sign hbb‾hb\overline{b} coupling and the study of h→Zγh \rightarrow Z \gamma

It has been pointed out recently that current experiments still allow for a two Higgs doublet model where the $h b \bar{b}$ coupling ($k_D m_b/v$) is negative; a sign opposite to that of the Standard Model. Due to the importance of delayed decoupling in the $h H^+ H^-$ coupling, $h \rightarrow \gamma \gamma$ improved measurements will have a strong impact on this issue. For the same reason, measurements or even bounds on $h \rightarrow Z \gamma$ are potentially interesting. In this article, we revisit this problem, highlighting the crucial importance of $h \rightarrow VV$, which can be understood with simple arguments. We show that the impacts on $k_D<0$ models of both $h \rightarrow b \bar{b}$ and $h \rightarrow \tau^+ \tau^-$ are very sensitive to input values for the gluon fusion production mechanism; in contrast, $h \rightarrow \gamma \gamma$ and $h \rightarrow Z \gamma$ are not. We also inquire if the search for $h \rightarrow Z \gamma$ and its interplay with $h \rightarrow \gamma \gamma$ will impact the sign of the $h b \bar{b}$ coupling. Finally, we study these issues in the context of the Flipped two Higgs doublet model.Comment: 13 pages, pdf figure

Large pseudoscalar Yukawa couplings in the complex 2HDM

We start by presenting the current status of a complex flavour conserving two-Higgs doublet model. We will focus on some very interesting scenarios where unexpectedly the light Higgs couplings to leptons and to b-quarks can have a large pseudoscalar component with a vanishing scalar component. Predictions for the allowed parameter space at end of the next run with a total collected luminosity of $300 \, fb^{-1}$ and $3000 \, fb^{-1}$ are also discussed. These scenarios are not excluded by present data and most probably will survive the next LHC run. However, a measurement of the mixing angle $\phi_\tau$, between the scalar and pseudoscalar component of the 125 GeV Higgs, in the decay $h \to \tau^+ \tau^-$ will be able to probe many of these scenarios, even with low luminosity. Similarly, a measurement of $\phi_t$ in the vertex $\bar t t h$ could help to constrain the low $\tan \beta$ region in the Type I model.Comment: 21 pages, 10 figure

Perceived image of Lisbon by foreign tourists

Mestrado em MarketingTourism destination image is one of the most approached concepts in tourism scientific literature. It has become a subject of great matter in the tourism management field once it is considered one of the most determinant factors in tourist‘s choosing process. Lisbon is currently the most important tourism destination in Portugal and one of the top visited places in Europe. According to recent data from Turismo de Portugal, in 2012 Lisbon was the first tourism destination in Portugal with the largest number of visitors, suggesting an increasing interest for the city as a tourism destination. Therefore, this work aims to contribute for a better understanding of which are the most important components of the image of Lisbon as a tourism destination for foreign tourists. After a brief literature review, we decided that this research should be based on the tri-dimensional model, developed by Echtner & Ritchie (1993), since it involves not only a tangible and functional perspective, but also a psychological and holistic one, allowing a complete representation of the perceived tourism destination image of Lisbon. The results obtained confirm a strongly positive appreciation by the international community when it comes to evaluate Lisbon’s tourism destination image, including a good evaluation of its attributes, as well as the recognition of important unique holistic elements

CP violation in 2HDM and EFT: the ZZZ vertex

We study the CP violating ZZZ vertex in the two-Higgs doublet model, which is a probe of a Jarlskog-type invariant in the extended Higgs sector. The form factor $f_4^Z$ is evaluated at one loop in a general $R_\xi$ gauge and its magnitude is estimated in the realistic parameter space. Then we turn to the decoupling limit of the two-Higgs doublet model, where the extra scalars are heavy and the physics can be described by the Standard Model supplemented by higher-dimensional operators. The leading operator contributing to $f_4^Z$ at one loop is identified. The CP violating ZZZ vertex is not generated in the effective theory by dimension-8 operators, but instead arises only at the dimension-12 level, which implies an additional suppression by powers of the heavy Higgs mass scale.Comment: 21 pages; v2: added references and comments, appendix A on method of regions, and appendix B on derivation of CP-violating effective Lagrangian. Corrected discussion of dimension-12 operators contributing to ZZZ vertex. Final JHEP versio

Double insertions of SMEFT operators in gluon fusion Higgs boson production

Deviations from the Standard Model (SM) can be parameterized in terms of the SM effective field theory (SMEFT), which is typically truncated at dimension-6. Including higher dimension operators -- as well as considering simultaneous insertions of multiple dimension-6 operators -- may be necessary in some processes, in order to correctly capture the properties of the underlying UV theory. As a step towards clarifying this in the Higgs boson production in gluon fusion process, we study double insertions of dimension-6 operators in the 1-loop virtual amplitude. We present needed Feynman rules up to $\mathcal{O}(1/\Lambda^4)$ and we numerically study the impact of various approximations to the $\mathcal{O}(1/\Lambda^4)$ expansion.Comment: Auxiliary file replace

The ZbbˉZ b \bar b vertex in a left-right model

We consider the one-loop corrections to the $Z b \bar b$ vertex in a $CP$-conserving left--right model (LRM), $viz$. a model with gauge group $SU(2)_L \times SU(2)_R \times U(1)$. We allow the gauge coupling constants of $SU(2)_L$ and $SU(2)_R$ to be different. The spontaneous symmetry breaking is accomplished only by doublets and/or singlets of $SU(2)_L$ and $SU(2)_R$. The lightest massive neutral gauge boson of our LRM is assumed to have the same Yukawa couplings to bottom-quark pairs as the $Z$ of the Standard Model (SM); this assumption has the advantage that, then, the infrared divergences automatically cancel down in the subtraction of the $Z b \bar b$ vertex in the SM from the same vertex in the LRM. We effect a proper renormalization of the $Z b \bar b$ vertex and check explicitly both its gauge invariance and the cancellation of all the ultraviolet divergences. We find out that a LRM with the above assumptions cannot achieve a better fit to the $Z b \bar b$ vertex than a multi-Higgs extension of the SM, $viz$. both models can only achieve a decent fit when one admits scalar particles with very low masses $\lesssim 50$ GeV. This is true even when we allow for markedly different gauge coupling constants of $SU(2)_L$ and $SU(2)_R$.Comment: 57 pages, 8 figures; v2: added section 3, figure 2 and three references; v3: matches published versio

Reflexão ético-teológica sobre a fome no mundo e distribuição dos bens : análise da unidade letiva 3 do 6.º ano de escolaridade : A Partilha do Pão

O presente Relatório Final da Prática de Ensino Supervisionada elaborado no âmbito do Mestrado em Ciências Religiosas, na especialização em Educação Moral e Religiosa Católica, tem como propósito refletir sobre a forma como a disciplina de Educação Moral e Religiosa Católica poderá contribuir para a promoção de atitudes de fraternidade e de solidariedade, perante um problema tão antigo e tão novo como é o caso fome e da injusta distribuição dos bens. Realizada a pesquisa documental sobre a repartição dos bens numa ótica cristã e o agir cristão diante da fome, foi-se desenvolvendo um projeto baseado na Pedagogia do Serviço que permita aos alunos aprenderem, refletirem e servirem um problema social: a fome; ao mesmo tempo estarem mais disponíveis e mais sensíveis para a construção da fraternidade, da solidariedade, da partilha e da justiça.The present Final Report of Supervised Teaching Practice, elaborated in the scope of the Master´s Degree in Religious Sciences - specialization in Catholic Moral and Religious Education, aims to reflect on how the discipline of Catholic Moral and Religious Education can contribute to the promotion of attitudes of fraternity and solidarity, in the face of a problem as old and as new as hunger and the unjust distribution of resources. Once the documentary research on the distribution of goods in a Christian perspective and Christian action in the face of hunger was done, a project based on the Pedagogy of Service was developed to allow the students to learn, reflect and serve a social problem: hunger; at the same time to be more available and more sensitive to the construction of fraternity, solidarity, sharing and justice

Creencias populares y enseñanza de la Biología

The existence of some popular beliefs has been referred to by several studies. A few of these popular beliefs, which seem to be also widespread in Portugal, are related to biological contents. Therefore, it can be expected that many students hold some of these beliefs when they come to the biology classes. Based on this suspicion, the authors decided to investigate: - The degree of adhesion shown by students with different biology backgrounds, to some popular beliefs. - The importance given by some biology textbooks to the popular beliefs