France’s National Security Strategy

France is one of the EU member states with a most highly-developed national strategic culture. Victory in the Second World War, its role as a member of the United Nations Security Council, the development of a nuclear programme that gave the country the status of a nuclear power, united to the historical development of a sense of a global mission on the world stage, contributed to the development of a global vision for France’s role on the world arena. The exercise of setting out a global description of a long-term vision and strategy for defence policies in white books (Livre Blanc) had been conducted twice before, in 1972 and 1994. The latest 2008 White Paper on Defence and National Security preserves some of the basic patterns of its forerunners but introduced the concept of a national security strategy, that had not been developed before

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