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Measurements of inclusive charged-particle jet production in pp and p-Pb collisions at center-of-mass energy per nucleon-nucleon collision sNN−−−√=5.02 TeV and the corresponding nuclear modification factor RchjetpPb are presented, using data collected with the ALICE detector at the LHC. Jets are reconstructed in the central rapidity region |ηjet|<0.5 from charged particles using the anti-kT algorithm with resolution parameters R=0.2, 0.3, and 0.4. The pT-differential inclusive production cross section of charged-particle jets, as well as the corresponding cross section ratios, are reported for pp and p-Pb collisions in the transverse momentum range 10<pchT,jet<140 GeV/c and 10<pchT,jet<160 GeV/c, respectively, together with the nuclear modification factor RchjetpPb in the range 10<pchT,jet<140 GeV/c. The analysis extends the pT range of the previously-reported charged-particle jet measurements by the ALICE Collaboration. The nuclear modification factor is found to be consistent with one and independent of the jet resolution parameter with the improved precision of this study, indicating that the possible influence of cold nuclear matter effects on the production cross section of charged-particle jets in p-Pb collisions at sNN−−−√=5.02 TeV is smaller than the current precision. The obtained results are in agreement with other minimum bias jet measurements available for RHIC and LHC energies, and are well reproduced by the NLO perturbative QCD POWHEG calculations with parton shower provided by PYTHIA8 as well as by JETSCAPE simulations.
Understanding the role of parton mass and Casimir colour factors in the quantum chromodynamics parton shower represents an important step in characterising the emission properties of heavy quarks. Recent experimental advances in jet substructure techniques have provided the opportunity to isolate and characterise gluon emissions from heavy quarks. In this work, the first direct experimental constraint on the charm-quark splitting function is presented, obtained via the measurement of the groomed shared momentum fraction of the first splitting in charm jets, tagged by a reconstructed D0 meson. The measurement is made in proton-proton collisions at s√ = 13 TeV, in the low jet transverse-momentum interval of 15≤pjet chT<30 GeV/c where the emission properties are sensitive to parton mass effects. In addition, the opening angle of the first perturbative emission of the charm quark, as well as the number of perturbative emissions it undergoes, is reported. Comparisons to measurements of an inclusive-jet sample show a steeper splitting function for charm quarks compared with gluons and light quarks. Charm quarks also undergo fewer perturbative emissions in the parton shower, with a reduced probability of large-angle emissions.
Understanding the role of parton mass and Casimir colour factors in the quantum chromodynamics parton shower represents an important step in characterising the emission properties of heavy quarks. Recent experimental advances in jet substructure techniques have provided the opportunity to isolate and characterise gluon emissions from heavy quarks. In this work, the first direct experimental constraint on the charm-quark splitting function is presented, obtained via the measurement of the groomed shared momentum fraction of the first splitting in charm jets, tagged by a reconstructed D0 meson. The measurement is made in proton-proton collisions at s√ = 13 TeV, in the low jet transverse-momentum interval of 15≤pjet chT<30 GeV/c where the emission properties are sensitive to parton mass effects. In addition, the opening angle of the first perturbative emission of the charm quark, as well as the number of perturbative emissions it undergoes, is reported. Comparisons to measurements of an inclusive-jet sample show a steeper splitting function for charm quarks compared with gluons and light quarks. Charm quarks also undergo fewer perturbative emissions in the parton shower, with a reduced probability of large-angle emissions.
Der verstärkte Umgang mit Wissen in den Wirtschaftswissenschaften ist in den letzten Jahren in den Fokus der Wissenschaftler geraten. Ausgeblendet wurde dabei größtenteils die Kehrseite von Wissen, die Frage nach dem "Nichtwissen". Das Nichtwissen ist aufgrund der vorherrschenden Auffassung des gesellschaftlichen Bildes mit einer negativen Notation behaftet. Die zunehmende Auseinandersetzung des Nichtwissens in den Geisteswissenschaften bringt die positiven Funktionen zur Geltung. Der vorliegende Artikel zeigt zunächst die erfolgsfördernden Funktionen des Nichtwissens auf und implementiert somit Chancen des Nichtwissens in einem wirtschaftwissenschaftlichen Rahmen. Im Anschluss werden empirische Befunde, resultierend aus einer Befragung, die an der Goethe Universität Frankfurt am Main durchgeführt wurde, präsentiert.
We test two hypotheses, based on sexual selection theory, about gender differences in costly social interactions. Differential selectivity states that women invest less than men in interactions with new individuals. Differential opportunism states that women’s investment in social interactions is less responsive to information about the interaction’s payoffs. The hypotheses imply that women’s social networks are more stable and path dependent and composed of a greater proportion of strong relative to weak links. During their introductory week, we let new university students play an experimental trust game, first with one anonymous partner, then with the same and a new partner. Consistent with our hypotheses, we find that women invest less than men in new partners and that their investments are only half as responsive to information about the likely returns to the investment. Moreover, subsequent formation of students’ real social networks is consistent with the experimental results: being randomly assigned to the same introductory group has a much larger positive effect on women’s likelihood of reporting a subsequent friendship.
Essays in behavioral economics - evidence on self-selection into jobs, social networks and leniency
(2013)
Die Dissertation mit dem Titel „Essays in Behavioral Economics – Evidence on Self-Selection into Jobs, Social Networks and Leniency“ besteht aus einer Sammlung von vier wissenschaftlichen Abhandlungen. Alle Arbeiten verbindet die Analyse von theoretischen Konzepten und Erkenntnissen der Verhaltensökonomie unter Verwendung der experimentellen Methode. Die erste wissenschaftliche Abhandlung trägt den Titel „Sorting of Motivated Agents - Empirical Evidence on Self-Selection into the German Police“ und untersucht Selbstselektion bestimmter Individuen in den Polizeiberuf. Die experimentelle Studie untersucht die Frage, ob Polizeibewerber sich hinsichtlich ihrer Präferenzen in Bezug auf ihr Normdurchsetzungsverhalten in den Polizeiberuf selektieren. Die zweite Abhandlung greift diese Erkenntnisse auf und untersucht Polizeianwärter in ihrer Berufsausbildung ebenfalls hinsichtlich ihrer Normdurchsetzungsbereitschaft. Die Arbeit trägt den Titel „Selection and formation of motivated agents -- empirical evidence from the German Police”. In der dritten wissenschaftlichen Abhandlung werden geschlechterspezifische Unterschiede bei der Wahl von Partnern und dem Aufbau des sozialen Netzwerkes untersucht. Diese trägt den Titel „Selectivity and opportunism: two dimensions of gender differences in trust games and network formation“ und wurde zusammen mit Guido Friebel, Marie Lalanne, Paul Seabright und Peter Schwardmann verfasst. Die vierte Abhandlung geht einer aktuellen Fragestellung der Industrieökonomie nach und trägt den Titel „Antitrust, auditing and leniency programs: evidence from the laboratory“, verfasst mit Mehdi Feizi and Ali Mazyaki. In ihrer Gesamtheit liefert meine Dissertation Antworten auf personalpolitische, soziale und industrieökonomische Fragestellungen.