Measurement of the inclusive and dijet cross-sections of b-jets in pp collisions at sqrt(s) = 7 TeV with the ATLAS detector

The inclusive and dijet production cross-sections have been measured for jets containing b-hadrons (b-jets) in proton-proton collisions at a centre-of-mass energy of sqrt(s) = 7 TeV, using the ATLAS detector at the LHC. The measurements use data corresponding to an integrated luminosity of 34 pb^-1. The b-jets are identified using either a lifetime-based method, where secondary decay vertices of b-hadrons in jets are reconstructed using information from the tracking detectors, or a muon-based method where the presence of a muon is used to identify semileptonic decays of b-hadrons inside jets. The inclusive b-jet cross-section is measured as a function of transverse momentum in the range 20 < pT < 400 GeV and rapidity in the range |y| < 2.1. The bbbar-dijet cross-section is measured as a function of the dijet invariant mass in the range 110 < m_jj < 760 GeV, the azimuthal angle difference between the two jets and the angular variable chi in two dijet mass regions. The results are compared with next-to-leading-order QCD predictions. Good agreement is observed between the measured cross-sections and the predictions obtained using POWHEG + Pythia. MC@NLO + Herwig shows good agreement with the measured bbbar-dijet cross-section. However, it does not reproduce the measured inclusive cross-section well, particularly for central b-jets with large transverse momenta.Comment: 10 pages plus author list (21 pages total), 8 figures, 1 table, final version published in European Physical Journal

Family dynamics and intergenerational entrepreneurs’ leadership style

Abstract Studies have shown that a family plays an important role in encouraging people to pursue an entrepreneurial career. Consequently, studies have indicated that involvement in a family role may have an effect on functioning in a non-family, work role. This study attempts to find out how behaviours, values, family structure and interpersonal interaction styles from parents can be transferred to the entrepreneur’s role, as a leader, in a work environment. Specifically, this study is conducted to understand how certain parenting skills, structure, and styles enhance an entrepreneur’s ability to be more efficient and effective at work. Based on the various parenting styles and family structure, propositions are made on the kind of leadership style that may arise from family dynamics. The author argues that there are various points in time where family and entrepreneurial dynamics intersect. This study argues that one very important intersection includes the entrepreneur early experiences with the family which may lead to the development of specific leadership approach at work. In this article, the author attempt to tie two streams of research together to show how entrepreneurs and their families are inextricably linked together. It is an attempt to explore the theories of family structure and parental styles to further depict these links with leadership. These areas are explored and research questions that could be empirically tested are addressed for a better understanding of how family dynamics can affect leadership. This study also explains the kind of socialization experiences that take place within the family that may lead to entrepreneurial behaviour. Such information could prove valuable to entrepreneur leaders who wish to understand their own approach towards leadership. This is important because different working environment will require specific leadership approach in order for the business to be successful. Such study would also help educational institutions to develop curriculum and training that might prove more useful in inculcating entrepreneurial values and leadership into students

Measurement of the inclusive isolated prompt photon cross section in pp collisions at √s=7 TeV with the ATLAS detector

A measurement of the cross section for the inclusive production of isolated prompt photons in pp collisions at a center-of-mass energy [sqrt]s=7  TeV is presented. The measurement covers the pseudorapidity ranges |etaγ|<1.37 and 1.52≤|etaγ|<1.81 in the transverse energy range 15≤ETγ<100  GeV. The results are based on an integrated luminosity of 880  nb-1, collected with the ATLAS detector at the Large Hadron Collider. Photon candidates are identified by combining information from the calorimeters and from the inner tracker. Residual background in the selected sample is estimated from data based on the observed distribution of the transverse isolation energy in a narrow cone around the photon candidate. The results are compared to predictions from next-to-leading-order perturbative QCD calculations.United States. Dept. of EnergyNational Science Foundation (U.S.