Search results for "Naturalness"
showing 10 items of 21 documents
Analisi della naturalità del mosaico territoriale in Sicilia
2009
A new index (NEI - Naturalness Evaluation Index) is applied in order to evaluate the landscape degree of conservation and naturalness. Land mosaic has been classified into four different levels of conservation, taking into account the relative influence of natural processes and anthropic activities. Fitocoenoses structure and floristic composition are used as indicators. As a case study Sicily (Italy) was chosen. The methodology has been applied to reclassify Corine Land Cover data and obtain a Naturalness map. The area of study has been divided into reference units (municipalities) and the index has been calculated for each land unit. The index has proved to be very useful for visualising …
Heavy Higgs of the Twin Higgs models
2018
Twin Higgs models are the prime illustration of neutral naturalness, where the new particles of the twin sector, gauge singlets of the Standard Model (SM), ameliorate the little hierarchy problem. In this work, we analyse phenomenological implications of the heavy Higgs of the Mirror Twin Higgs and Fraternal Twin Higgs models, when electroweak symmetry breaking is linearly realized. The most general structure of twin Higgs symmetry breaking, including explicit soft and hard breaking terms in the scalar potential, is employed. The direct and indirect searches at the LHC are used to probe the parameter space of Twin Higgs models through mixing of the heavy Higgs with the SM Higgs and decays o…
The Adequacy of Resemblance Nominalism about Perfect Naturalness
2016
extended MSSM
2012
We investigate the perturbative regime of the Minimal Supersymmetric Con- formal Technicolor and show that it allows for a stable vacuum correctly breaking the electroweak symmetry. We nd that the particle spectrum is richer than the MSSM one since it features several new particles stemming out from the new N = 4 sector of the theory. The parameter space of the new theory is reduced imposing naturalness of the cou- plings and soft supersymmetry breaking masses, perturbativity of the model at the EW scale as well as phenomenological constraints. By studying the RGEs at two loops we nd that the Yukawa couplings of the heavy fermionic states
Large-$N_c$ naturalness in coupled-channel meson-meson scattering
2014
The analysis of hadronic interactions with effective field theory techniques is complicated by the appearance of a large number of low-energy constants, which are usually fitted to data. On the other hand, the large-$N_c$ limit imposes natural short-distance constraints on these low-energy constants, providing a parameter reduction. A Bayesian interpretation of the expected $1/N_c$ accuracy allows for an easy and efficient implementation of these constraints, using an augmented $\chi^2$. We apply this approach to the analysis of meson-meson scattering, in conjunction with chiral perturbation theory to one loop and coupled-channel unitarity, and show that it helps to largely reduce the many …
Long-lived particles at the energy frontier: the MATHUSLA physics case
2019
We examine the theoretical motivations for long-lived particle (LLP) signals at the LHC in a comprehensive survey of Standard Model (SM) extensions. LLPs are a common prediction of a wide range of theories that address unsolved fundamental mysteries such as naturalness, dark matter, baryogenesis and neutrino masses, and represent a natural and generic possibility for physics beyond the SM (BSM). In most cases the LLP lifetime can be treated as a free parameter from the $\mu$m scale up to the Big Bang Nucleosynthesis limit of $\sim 10^7$m. Neutral LLPs with lifetimes above $\sim$ 100m are particularly difficult to probe, as the sensitivity of the LHC main detectors is limited by challenging …
(Un)Natural and contractual international society: A conceptual inquiry
2011
This article offers a critical perspective on one of the central concepts of IR and the English School of IR in particular, namely the concept of international society. It argues that the moral agency of international society and its ‘naturalness’ were affirmed simultaneously with the marginalization of the concept of societas designating contractual political relations. The article traces the concept of contracted societas back to the work of Hugo Grotius, an acclaimed founder of the ‘international society’ tradition. By placing Grotius’ use of the concept in the context of ancient and early modern discussion of political alliances and partnerships, it demonstrates that politically contra…
Markedness and Naturalness in the Acquisition of Phonology
2002
pennock@uv.es (este artículo no aparece en grec)
The Visual Quality of Urban Park Scenes of Kowloon Park, Hong Kong: Likeability, Affective Appraisal, and Cross-Cultural Perspectives
2005
The urban park is a place where urbanites can escape from the stresses of everyday life. Using a set of fifteen photographs as visual stimuli, we attempted to identify those scenes that are liked by visitors to Kowloon Park, Hong Kong. The visual quality of an urban park scene is measured by its likeability, referring to the probability that the scene will evoke a strong and positive response among the users of the park. Because Hong Kong is an international metropolis, the respondent sample included both Hong Kong residents and tourists. The principal component analysis revealed the three underlying ‘dimensions’ of the appraisal aspects of the data: the ‘affective’ component, the ‘managem…