Les préférences des consommateurs pour un écolabel. Le cas des produits de la mer en France

Une certification nationale reconnaissant la qualité écologique des produits de la mer (PDM) tarde à voir le jour en France. Annoncée dans la loi Grenelle I en 2009, le décret relatif à l'écolabel public des produits de la pêche maritime n'a été publié que le 27 janvier 2012 alors que les obtentions d'écolabels privés se multiplient. Dans cet article, les facteurs influençant la perception des consommateurs pour les PDM écolabellisés sont étudiés à partir d'une enquête menée auprès de plus de 900 consommateurs français en 2010. Les résultats montrent que la préférence pour des PDM écolabellisés est plus marquée parmi les jeunes. Les caractéristiques liées au processus de production et de commercialisation comme l'attention portée à l'origine géographique des PDM, à leur caractère sauvage ou aquacole, à la technique de pêche et au degré d'exploitation des ressources, favorisent la demande d'information environnementale des consommateurs

Search for dark matter produced in association with bottom or top quarks in √s = 13 TeV pp collisions with the ATLAS detector

A search for weakly interacting massive particle dark matter produced in association with bottom or top quarks is presented. Final states containing third-generation quarks and miss- ing transverse momentum are considered. The analysis uses 36.1 fb−1 of proton–proton collision data recorded by the ATLAS experiment at √s = 13 TeV in 2015 and 2016. No significant excess of events above the estimated backgrounds is observed. The results are in- terpreted in the framework of simplified models of spin-0 dark-matter mediators. For colour- neutral spin-0 mediators produced in association with top quarks and decaying into a pair of dark-matter particles, mediator masses below 50 GeV are excluded assuming a dark-matter candidate mass of 1 GeV and unitary couplings. For scalar and pseudoscalar mediators produced in association with bottom quarks, the search sets limits on the production cross- section of 300 times the predicted rate for mediators with masses between 10 and 50 GeV and assuming a dark-matter mass of 1 GeV and unitary coupling. Constraints on colour- charged scalar simplified models are also presented. Assuming a dark-matter particle mass of 35 GeV, mediator particles with mass below 1.1 TeV are excluded for couplings yielding a dark-matter relic density consistent with measurements

Les préférences des consommateurs pour un écolabel. Le cas des produits de la mer en France

A national labelling scheme recognising the environmental quality for seafood products is still expected in France. Announced by the Grenelle law of 2009, the by-law setting a public ecolabel has only been adopted on January 27th 2012. In the meantime, several private initiatives have already emerged. In this paper, the factors influencing the consumers’ perceptions for seafood eco-labels are analysed on the basis of a survey carried out on more than 900 consumers. Our results show a higher preference from young and educated citizens. The production process and marketing characteristics such as the attention paid to the geographical origin of seafood products, their farmed or wild origin, the fishing technique and the exploitation level of natural stocks, strengthen the preference for eco-labels