University of Johannesburg

About: University of Johannesburg is a education organization based out in Johannesburg, South Africa. It is known for research contribution in the topics: Population & Context (language use). The organization has 8070 authors who have published 22749 publications receiving 329408 citations. The organization is also known as: UJ.

Performance of the ATLAS track reconstruction algorithms in dense environments in LHC Run 2

Abstract: With the increase in energy of the Large Hadron Collider to a centre-of-mass energy of 13 TeV for Run 2, e vents with dense environments, such as in the cores of high-energy jets, became a focus for new physics searches as well as measurements of the Standard Model. These environments are characterized by charged-particle separations of the order of the tracking detectors sensor granularity. Basic track quantities are compared between 3.2 fb - 1 of data collected by the ATLAS experiment and simulation of proton–proton collisions producing high-transverse-momentum jets at a centre-of-mass energy of 13 TeV. The impact of charged-particle separations and multiplicities on the track reconstruction performance is discussed. The track reconstruction efficiency in the cores of jets with transverse momenta between 200 and 1600 GeV is quantified using a novel, data-driven, method. The method uses the energy loss, dE/dx, to identify pixel clusters originating from two charged particles. Of the charged particles creating these clusters, the measured fraction that fail to be reconstructed is 0.061±0.006(stat.)±0.014(syst.) and 0.093±0.017(stat.)±0.021(syst.) for jet transverse momenta of 200–400 GeV and 1400–1600 GeV , respectively.

Anti-Politics as Political Strategy: Neoliberalism and Transfrontier Conservation in Southern Africa

Abstract: Studies on conservation and development often point out that interventions rely on anti-political manoeuvring to acquire legitimacy and support. Recent ‘aidnography’, in particular, has done much to expand and add nuance to our understanding of the complex, micro- (anti-)politics at work in conservation and development interventions. In doing this, however, aidnography seems to have led the focus away from two crucial, broader issues related to conservation and development interventions: how they are regulated through the wider, neoliberal political economy, and how this fuels and obscures (global) inequality. Drawing on empirical research on a transfrontier conservation and development intervention in Southern Africa, this article argues that the differential workings of anti-politics in practice warrant a renewed appreciation and a more explicit political operationalization of the concept. This is done by re-emphasizing anti-politics as an essential political strategy within conservation and development interventions and as an intrinsic element of the wider political economy of neoliberalism.

Measurement of the production of a W boson in association with a charm quark in pp collisions at s√ = 7 TeV with the ATLAS detector

Abstract: Measurement of the production of a W boson in association with a charm quark in pp collisions at root s=7 TeV with the ATLAS detector

Will More Black Cops Matter? Officer Race and Police‐Involved Homicides of Black Citizens

Abstract: In response to police-involved homicides of black citizens in Ferguson, Missouri, and elsewhere, some have suggested that more black police officers could reduce the number of these events. The authors offer an empirical test of this assertion. The literature offers conflicting expectations: some studies suggest that increased representation reduces discrimination, while others suggest that it increases discrimination. The authors reconcile these perspectives using the concept of critical mass, which leads to the expectation that an increase in black officers will reduce the number of black citizens killed in encounters with police, but only once the proportion of black officers is sufficiently large. We test this expectation in analyses of recently compiled data on police-involved homicides in 2014 and 2015 in large U.S. cities.