NNLL soft and Coulomb resummation for squark and gluino production at the LHC

We present predictions for the total cross sections for pair production of squarks and gluinos at the LHC including a combined NNLL resummation of soft and Coulomb gluon effects. We derive all terms in the NNLO cross section that are enhanced near the production threshold, which include contributions from spin-dependent potentials and so-called annihilation corrections. The NNLL corrections at $\sqrt{s}=13$ TeV range from up to $20\%$ for squark-squark production to $90\%$ for gluino pair production relative to the NLO results and reduce the theoretical uncertainties of the perturbative calculation to the $10\%$ level. Grid files with our numerical results are publicly available.Comment: 42 pages, 17 figures. v2: published version; corrected fig. 6; generalized eq.(A.5) to arbitrary SU(N) gauge group

Roles for structuring groups for collaboration

The emergence of productive collaboration benefits from support for group interaction. Structuring is a broad way to refer to such support, as part of which roles have become a boundary object in computer-supported collaborative learning. The term structuring is related to—yet distinct from—other approaches to support such as scaffolding, structured interdependence, and scripting. Roles can be conceived as a specific (set of) behavior(s) that can be taken up by an individual within a group. They can be assigned in advance or emerge during group interaction. Roles raise individual group member’s awareness of their own and fellow group member’s responsibilities, and they make an individual’s responsibilities toward the group’s functioning visible for all group members. In future research, pedagogical issues with respect to role design, assignment, and rotation as well as automated detection and visualization of emergent roles, should be addressed

Monitor Noord-Groningen 2020

In opdracht van Economic Board Groningen heeft Marklinq, na 2016 en 2018, een derde Monitor van de Economie van Noord-Groningen opgesteld. Een van de conclusies: de werkgelegenheid is in de periode 2015-2019 licht gestegen in de regio, ondanks aardbevingen en veronderstelde leegloop