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

The Crowdsourced Replication Initiative: Investigating Immigration and Social Policy Preferences. Executive Report.

In an era of mass migration, social scientists, populist parties and social movements raise concerns over the future of immigration-destination societies. What impacts does this have on policy and social solidarity? Comparative cross-national research, relying mostly on secondary data, has findings in different directions. There is a threat of selective model reporting and lack of replicability. The heterogeneity of countries obscures attempts to clearly define data-generating models. P-hacking and HARKing lurk among standard research practices in this area.This project employs crowdsourcing to address these issues. It draws on replication, deliberation, meta-analysis and harnessing the power of many minds at once. The Crowdsourced Replication Initiative carries two main goals, (a) to better investigate the linkage between immigration and social policy preferences across countries, and (b) to develop crowdsourcing as a social science method. The Executive Report provides short reviews of the area of social policy preferences and immigration, and the methods and impetus behind crowdsourcing plus a description of the entire project. Three main areas of findings will appear in three papers, that are registered as PAPs or in process

Regionalmanagement - Potentiale, Grenzen und Perspektiven: Ergebnisse einer Untersuchung in Sachsen-Anhalt

The concept of regional management has gained more and more importance over the last decade. Based on empirical studies of three regions in Saxony-Anhalt, the concept of regional management was closely examined from a theoretical and practical perspective to find out the efficiency of this concept. The results of this analysis are presented in this essay. The structures of the regional management of the three case studies will be presented and quality criteria will be identified. Problems of implementation are also shown. On this basis, recommendations will be drawn for the future implementation of regional management concepts.Der Regionalmanagementansatz erfährt seit ungefähr einem Jahrzehnt eine zunehmende Aufmerksamkeit. Mit dem Ziel, die Leistungsfähigkeit dieses vielseits diskutierten Regionalmanagementansatzes zu untersuchen, wurde das Konzept aus theoretischer und praxisorientierter Perspektive in drei Regionen in Sachsen-Anhalt einer kritischen Analyse unterzogen. Die daraus gewonnenen Erkenntnisse werden in diesem Aufsatz dargelegt. Dabei werden u.a. die Regionalmanagementansätze der drei Beispielregionen vorgestellt und qualitätsbestimmende Faktoren identifiziert. Darüber hinaus werden Mängel bei der Implementierung aufgezeigt und daraus Empfehlungen für die zukünftige Ausgestaltung des Regionalmanagements abgeleitet