Advances in Research with LGBTQ Youth in Schools

Over the past decade, there has been an increase in scholarship devoted to the topic of sexual and gender minority youth in schools (e.g., lesbian, gay, bisexual, transgender, queer, or questioning; LGBTQ). In this special section, we highlight this group of LGBTQ youth, a group that needs as many allies as possible, a group that lacks the social standing, the financial capital necessary, and the rights afforded to adults to directly influence the political climate in ways that affect their lives. Collectively, these seven data-driven articles are reflective of the innovation that is occurring in our field as we continue to study the experiences of LGBTQ youth in schools. They also highlight how there is room to expand our research efforts to better ensure that the social, educational, and developmental needs of LGBTQ students are met by our schools

Origin of neutrino masses at the LHC: Delta L = 2 effective operators and their ultraviolet completions

Neutrino masses and mixings can be generated in many different ways, with some of these scenarios featuring new physics at energy scales relevant for Large Hadron Collider searches. A systematic approach to constructing a large class of models for Majorana neutrinos may be founded upon a list of gauge-invariant effective operators -- formed from quarks, leptons and the Higgs doublet -- that violate lepton-number conservation by two units. By opening up these operators in all possible ways consistent with some minimality assumptions, a complete catalogue of a class of minimal radiative neutrino mass models may be produced. In this paper we present an analysis of Feynman diagram topologies relevant for the ultra-violet completions of these effective operators and collect these into a simple recipe that can be used to generate radiative neutrino mass models. Since high mass-dimension effective operators are suppressed by powers of the scale of new physics, many of the resulting models can be meaningfully tested at the Large Hadron Collider.Comment: 32 pages, 15 figures. v2: Minor changes: added discussion about the scope of the analysis, added referenc

Convergence of Firm-Level Productivity, Globalisation, Information Technology and Competition: Evidence from France

Studies of firm-level data have shown that there is a huge dispersion of productivity across firms even when industries are narrowly defined. So there is a significant opportunity for the least productive firms to catch up to the most productive. The formers' convergence could therefore constitute an important part of productivity growth at the macroeconomic level. This article sheds light on this convergence process in the 1990s and the 2000s in France and on some of the factors which can explain it. Productivity convergence was stronger for labour productivity than for total factor productivity. But most importantly the speed of convergence has slowed during the course of the 1990s, a fact which is explained principally by the acceleration of the productivity of firms on the technological frontier. Three possible explanations of these stylised facts are considered: globalisation, information technology, and competition. Globalisation and information technology may have benefited the most productive firms more and the growth of competition may at the same time have stimulated the productivity of firms at the frontier while discouraging the convergence of the least productive firms.Convergence, productivity, TFP, globalisation, ICT, competition