Direct-photon and heavy-flavour production in proton-proton collisions at s=7\sqrt{s} = 7 TeV with ALICE

Low-mass dielectron measurements play an essential role in the study of the Quark-Gluon Plasma (QGP) created in ultra-relativistic heavy-ion collisions. They are produced in all stages of the collision and are not affected by final-state interactions. Thus, they provide a penetrating probe of the created medium. In the dielectron intermediate-mass region a measurement of the thermal radiation from the QGP gives information on the medium temperature. However, in this region the main component of the dielectron continuum stems from correlated semi-leptonic decays of charm and beauty hadrons. Therefore, it is crucial to understand the heavy-flavour (HF) production in vacuum and to find a way to separate this contribution from the thermal dielectron signal of the QGP. In this paper we will present the production of correlated $\rm e^+e^-$ pairs in pp collisions at $\sqrt{s} = 7$ TeV with the expectations from known hadronic sources as a function of $m_{\rm ee}$, $p_{\rm T,ee}$, and the pair distance of closest approach to the primary vertex $\rm DCA_{ee}$. The extraction of the ratio of inclusive photons to decay photons and the charm and beauty cross sections from a fit of the data with different Monte-Carlo generators are presented, providing insight into the mechanisms of heavy-flavour production. In particular, we demonstrate how the $\rm DCA_{ee}$ variable will allow prompt and non-prompt dielectron pairs to be separated and thus help to disentangle the contribution of thermal radiation from the contribution of charm and beauty. Finally, we present the prospect of extending this analysis to proton-lead collisions

Dielectron production in proton-proton collisions at s=7\sqrt{s} = 7 TeV with ALICE

The ALICE Collaboration measured dielectron production as a function of the invariant mass ($m_{\rm ee}$), the pair transverse momentum ($p_{\rm T,ee}$) and the pair distance of closest approach ($\rm DCA_{ee}$) in pp collisions at $\sqrt{s} = 7$ TeV. Prompt and non-prompt dielectron sources can be separated with the $\rm DCA_{ee}$, which will give the opportunity in heavy-ion collisions to identify thermal radiation from the medium in the intermediate-mass range dominated by contributions from open-charm and beauty hadron decays. The charm and beauty total cross sections are extracted from the data by fitting the spectra with two different MC generators, i.e. PYTHIA a leading order event generator and POWHEG a next-to-leading order event generator. Significant model dependences are observed, reflecting the sensitivity of this measurement to the heavy-flavour production mechanisms

Measurement of heavy-quark production via dielectrons in pp and p-Pb collisions with ALICE at the LHC

Heavy quarks are useful probes to investigate the properties of the Quark-Gluon Plasma (QGP) produced in heavy-ion collisions at the LHC, since they are produced in initial hard scattering processes. To single out the signals that are characteristic of the QGP, it is nevertheless crucial to understand the primordial heavy-quark production in vacuum, and to disentangle hot from cold nuclear matter effects. Moreover, observations of collective effects in high-multiplicity pp and p-Pb collisions show surprising similarities with those in heavy-ion collisions. Heavy-flavour production in such collisions could give further insight into the underlying processes. The heavy-flavour production can be studied with $\rm e^{+}e^{-}$ pairs from correlated semileptonic decays of heavy-flavour hadrons. Compared to single heavy-flavour measurements, the dielectron yield contains information about the initial kinematical correlations between the charm and anti-charm quarks, which is otherwise not accessible, and is sensitive to soft heavy-flavour production. We report results on correlated $\rm e^{+}e^{-}$ pairs in pp collisions recorded by the ALICE detector at different collision energies. The production of heavy quarks is discussed by comparing the yield of dielectrons from heavy-flavour hadron decays as a function of invariant mass, pair transverse momentum and distance of closest approach to the primary vertex with different Monte Carlo event generators. The heavy-flavour production cross sections are also presented. Results from high-multiplicity pp collisions at $\sqrt{s} = 13$ TeV and the status of the p-Pb analysis at $\sqrt{s_{\rm NN}} = 5.02$ TeV are reported as well.Comment: Contribution to EPS-HEP 2019, submitted Proceedings of Scienc

Mission as mediation : mediation and social transformation as a task of christian church

Text in GermanThis thesis takes as a starting point the societal change in Germany with its concomitant economic risks for substantial parts of the population. Evangelical churches in Germany have yet to react to this change. While the relationship between social work and mission has been a point of widespread discussion within the evangelical movement internationally, it fails to have any impact on local churches. The question is thus: how can a mission-oriented church benefit from Christian social reform movements? Transformative as well as holistic understandings of mission have already yielded an enlarged vision of mission as encompassing social justice. But how about a missiological paradigm which is practically translatable into cultural and social relevance as far as the local church’s vision for becoming an agent of societal change/reform is concerned? When interpreted missiologically, mediation can be such a useful paradigm, as its essence is conflict as a constant anthropological signifier of human/divine distance on the one side and God’s purpose of redemption as reflected in the church’s mission on the other. Thus mediation could be called a category of the missio dei. This practical implementation into the church’s work as being relevant for its community is reached by reverting to the sciences of social work, namely the concept of community development. As mediative community work, this approach will add to the profile of a mission-oriented church as determined to serve a holistic vision of the gospel. At the focus is thus the immediate social environment of a local church, in which it can trigger spiritual, personal, social, cultural and economic processes of transformation. In the social context of Germany this way of expressing the missiological drive of a local church seems to be a hopeful avenue, since the social and economic risks are likely to remain and are threatening a large percentage of the population with social marginalisation. It is here that the economy of community work will be furnishing useful aspects to help a mission-oriented church develop its mediative-communal thrust into its immediate social context in order to proclaim God’s redemptive purpose.Ausgangspunkt dieser Arbeit ist die Beobachtung des gesellschaftlichen Wandels in der Bundesrepublik Deutschland samt seiner sozialen und ökonomischen Risiken für weite Teile der Bevölkerung. Eine Antwort auf diesen Transformationsprozess ist seitens der evangelikalen Kirchen in Deutschland ausgeblieben. Die Frage nach der Verhältnisbestimmung zwischen sozialer Arbeit und Mission ist in der evangelikalen Bewegung zwar international breit diskutiert worden, doch hat sie kaum Wirkung auf die Praxis der örtlichen Gemeinden in Deutschland gezeigt. Bearbeitet wird daher die Fragestellung, wie eine missionarisch orientierte Gemeinde in ihrem Sendungsauftrag Initiativen christlicher Sozialreformen umsetzen kann. Transformative und ganzheitliche Missionskonzepte haben bereits ein erweitertes Missionsverständnis hervorgebracht, welches die soziale Gerechtigkeit als missionarischen Auftrag mit einschließt. Die Frage stellt sich nun nach einem missionstheologischen Paradigma, welches praktisch in eine kultur- und gesellschaftsrelevante Tätigkeit einer missionalen Gemeinde umgesetzt werden kann, durch die sie zu einem Träger einer christlich geprägten Sozialreform wird. Das Paradigma, das hierfür erarbeitet und missionstheologisch gedeutet wird, ist das der Mediation. Sie offenbart in ihrem Wesen zum einen den Konflikt als anthropologische Konstante und somit die Distanz zu Gott und zum anderen die Heilsabsicht Gottes, die sich im Missionsauftrag an die Gemeinde widerspiegelt. So stellt sich die Mediation als Kategorie der missio dei dar. Die konkrete Umsetzung dieses Paradigmas in eine die Gesellschaft gestaltende Arbeit gelingt durch die Hinzuziehung des Arbeitsprinzips der Gemeinwesenarbeit aus der Sozialarbeitswissenschaft. In Form einer mediativ-gemeinwesenorientierten Arbeit gibt sie einer missional ausgerichteten Gemeinde die Möglichkeit ihren Sendungsauftrag mit einem umfassenden Heilsverständnis umzusetzen. Dabei steht der unmittelbare Sozialraum der lokalen Kirchengemeinde im Fokus des Interesses, in dem geistliche, persönliche, soziale kulturelle und ökonomische transformative Prozesse eingeleitet werden können. Bezugnehmend auf den Kontext der Bundesrepublik Deutschland erweist sich diese Art den Sendungsauftrag umzusetzen als hoffnungsträchtig, da die sozialen und ökonomischen Risiken in Zukunft weiter bestehen werden und ein nicht unerheblicher Teil der Bevölkerung bereits als sozial ausgegrenzt ist. Hier gibt insbesondere die Gemeinwesenökonomie Anhaltspunkte, wie eine mediativ-gemeinwesenorientierte missionale Gemeinde in ihrem Sozialraum den Heilswillen Gottes verkündigen kann.Christian Spirituality,Church History and MissiologyD. Th. (Missiology

Nationale test – et eksperiment til mere end 50 millioner

De nationale test i folkeskolen er nu snart klar til brug. Analysen her diskuterer formålet med testene set i lyset af den rapport om pædagogisk brug af test som Dansk Clearinghouse udgav tidligere i år. Rapporten viser at de positive virkninger som test kan have, opvejes af de negative virkninger når testene er udformet centralt og administreret centralt. Konklusionen er at hvis ikke man som lærer gør noget ekstra, har nationale test negative virkninger. Derfor skal der skal sættes ind i forhold til læreres kompetencer til at bruge testdata konstruktivt hvis de nationale test skal føre noget positivt med sig

Development and Performance Verification of the GANDALF High-Resolution Transient Recorder System

With present-day detectors in high energy physics one often faces fast analog pulses of a few nanoseconds length which cover large dynamic ranges. In many experiments both amplitude and timing information have to be measured with high accuracy. Additionally, the data rate per readout channel can reach several MHz, which leads to high demands on the separation of pile-up pulses. For an upgrade of the COMPASS experiment at CERN we have designed the GANDALF transient recorder with a resolution of 12bit@1GS/s and an analog bandwidth of 500\:MHz. Signals are digitized with high precision and processed by fast algorithms to extract pulse arrival times and amplitudes in real-time and to generate trigger signals for the experiment. With up to 16 analog channels, deep memories and a high data rate interface, this 6U-VME64x/VXS module is not only a dead-time free digitization unit but also has huge numerical capabilities provided by the implementation of a Virtex5-SXT FPGA. Fast algorithms implemented in the FPGA may be used to disentangle possible pile-up pulses and determine timing information from sampled pulse shapes with a time resolution better than 50 ps.Comment: 5 pages, 9 figure

Economic Growth and Employment Effects as a Result of the Upper Austrian Flood Protection Building Program

Starting in 2002, a continuous building of flood protection infrastructure aiming at preventing high monetary damages has been taking place in Upper Austria. As a result of investments in these flood protection measures between 2002 and 2015, significant positive effects on the gross regional product as well as on the employment level have been generated. However, the macroeconomic effects are found to depend substantially on the import quota for required materials

The Alternative for Germany’s radicalization in historical-comparative perspective

This article chronicles the AfD’s rightward repositioning and compares it with the programmatic development of three postwar German parties on the ideological wings. By highlighting factors that tilt the balance of power away from moderate reformers towards hardliners, this comparative analysis sheds light on the conditions that lead a relatively successful party on the ideological wings, such as the AfD, to radicalize its programme. Four variables stand out: whether party hardliners take the blame for the recent election loss; whether they offer a convincing programmatic and strategic alternative to the reformers; whether changes in party composition strengthen hardliners; and whether external factors enhance their weight within the party. The essay concludes that the AfD’s radicalization was unusual, but not exceptional. It is however too early to conclude that the Federal Republic’s distinctive institutions and political culture no longer impose significant costs on parties that shift their programmes away from the centre