Updated Predictions for Higgs Production at the Tevatron and the LHC

We present updated predictions for the total cross section for Higgs boson production through gluon fusion at hadron colliders. In addition to renormalization-group improvement at next-to-next-to-next-to-leading logarithmic accuracy, we incorporate the two-loop electroweak corrections, which leads to the most precise predictions at present. Numerical results are given for Higgs masses between 115 GeV and 200 GeV at the Tevatron with \sqrt{s}=1.96 TeV and the LHC with \sqrt{s}=7-14 TeV.Comment: 8 pages, 2 figures. v2: combined PDF+alpha_s uncertainties included; results using NNPDF2.0 added; upgrade CTEQ6.6->CT1

Top-Quark Pair Production Beyond Next-to-Leading Order

We report on recent calculations of the differential cross section for top-quark pair production at hadron colliders. The results are differential with respect to the top-pair invariant mass and to the partonic scattering angle. In these calculations, which were carried out by employing soft-collinear effective theory techniques, we resummed threshold logarithms up to next-to-next-to-leading logarithmic order. Starting from the differential cross section, it is possible to obtain theoretical predictions for the invariant-mass distribution and the total cross section. We summarize here our results for these observables, and we compare them with the results obtained from different calculational methods.Comment: Talk presented at Loops and Legs in Quantum Field Theory 2010, Woerlitz, Germany, April 25-30, 2010. 6 page

EU-Osterweiterung: Erfordert eine steigende Heterogenität der Mitglieder flexiblere EU-Institutionen?

Die für 2004 geplante Erweiterung der Europäischen Union auf 25 Mitgliedstaaten bringt enorme Herausforderungen für das institutionelle Regelwerk mit sich. Besonders brisant ist die Zuordnung einzelner Politikbereiche auf nationale oder europäische Entscheidungsinstanzen. Der vorliegende Beitrag rückt die Meinung der europäischen Bürger zu dieser Frage in den Mittelpunkt. Auf der Grundlage von Umfragen des Eurobarometer quantifizierten Prof. Dr. Joachim Ahrens, European Business School, International University Schloß Reichartshausen, und Martin Meurers, ifo Institut, die Heterogenität im Meinungsbild in der gegenwärtigen und in einer erweiterten Union und analysieren anhand der ermittelten Präferenzen für oder gegen eine EU-Kompetenz in einzelnen Politikbereichen die Implikationen für die Entscheidungsprozesse im Europäischen Ministerrat.EU-Erweiterung, EU-Staaten, Kompetenz, Präferenztheorie, Flexibilität

Compton Scattering by the Nucleon

The status of Compton scattering by the nucleon at energies of the first and second resonance is summarized. In addition to a general test of dispersion theories and a precise determination of polarizabilities, the validities of four fundamental sum rules are explored. {\it Recommended} averages of experimental values for the electromagnetic polarizabilities and spin-polarizabilities of the nucleon are determined: $\alpha_p=12.0\pm 0.6$, $\beta_p=1.9\mp 0.6$, $\alpha_n= 12.5 \pm 1.7$, $\beta_n= 2.7 \mp 1.8$ (unit $10^{-4}$fm$^3$), $\gamma^{(p)}_\pi= -38.7 \pm 1.8$, $\gamma^{(n)}_\pi = 58.6 \pm 4.0$ (unit $10^{-4}$fm$^4$).Comment: version appearing in the conference proceeding

Testing the causal mediation component of Dodge’s social information processing model of social competence and depression.

In Dodge’s model of “social information processing” depression is the result of a linear sequence of five stages of information processing (Dodge, 1993). These stages follow a person’s reaction to situational stimuli, such that each stage of information processing mediates the relationship between earlier and later stages. Because support for the social information processing model of depression has mainly come from retrospective examination of the literature (Dodge, 1993), we conducted a three wave prospective study including 92 adolescents without lifetime or current depression. Depressive symptoms and information processing were assessed by using well established measures employed in previous studies. The social information processing model was supported by cross-sectional results of our study. Based on prospective data we could only partially support the mediation hypotheses of the model. We discuss our unexpected results in light of limitation, including applied measures and sample characteristics

EUROPEAN ACCREDITATION AGENCY’S VIEW ON KAZAKHSTAN’S ENGINEERING AND INFORMATION TECHNOLOGY HIGHER EDUCATION

In the era of digital economy, there is an urgent need in highly qualified engineering and Information Technology (IT) specialists in Kazakhstan. The aim of the research is to analyse the needs of higher education in the field of engineering and IT in Kazakhstan underpinning elaboration of implications for higher education in the field of engineering and IT in Kazakhstan. The empirical study was carried out in October 2019. Exploratory study was implemented. Interpretive paradigm was employed in the present work. Non-structured interview served as the basis for data collection. Content analysis was performed for data analysis. Findings of theoretical analysis allow extending three-component model on needs analysis, namely experts’ perspective, educators’ perspective, and students’ perspective by the fourth component, namely community perspective. Implications for higher education in Kazakhstan are formulated as following: universities delivering higher education in the field of engineering and IT in Kazakhstan need to balance academic and practical components in their study programmes; interaction between educators and students, on the one side, as well as enterprises, companies and industry, on the other side, should be enhanced in higher education in the field of engineering and IT in Kazakhstan. Directions of future work are proposed.

Polarizabilities of the nucleon and spin dependent photo-absorption

The polarizabilities $\alpha$ (electric), $\beta$ (magnetic) and $\gamma_\pi$ (backward spin) of the nucleon are investigated in terms of degrees of freedom of the nucleon using recent results for the CGLN amplitudes and resonance couplings $A_{1/2}$ and $A_{3/2}$. The photon excitation strengths of the excited states are given in terms of partial integrated photoabsorption cross sections and resonant contributions of the Gerasimov-Drell-Hearn (GDH) sum rule. As a test of the present predictions, cross section differences $(\sigma_{3/2}-\sigma_{1/2})$ of the excited states are compared with data recently measured at MAMI (Mainz) and ELSA (Bonn), In order to explain differences between proton and neutron, radiative widths of the excited states are compared with nonrelativistic and relativistic predictions based on the SU(6) harmonic oscillator (HO) quark model, A complete list of partial contributions from the s-channel and the $t$-channel are given for the polarizabilities

Chiral nematic liquid crystals in torus-shaped and cylindrical cavities

We present a Monte Carlo simulation study of chiral nematic liquid crystals confined in torus-shaped and cylindrical cavities. For an achiral nematic with planar degenerate anchoring confined to a toroidal or cylindrical cavity, the ground state is defect free, with an untwisted director field. As chirality is introduced, the ground state remains defect free but the director field becomes twisted within the cavity. For homeotropic anchoring, the ground state for an achiral nematic within a toroidal cavity consists of two disclination rings, one large and one small, that follow the major circumference of the torus. As chirality is introduced and increased, this ground state becomes unstable with respect to twisted configurations. The closed nature of the toroidal cavity requires that only a half integer number of twists can be formed and this leads to the ground state being either a single disclination line that encircles the torus twice or a pair of intertwined disclination rings forming stable, knotted defect structures