Diphoton production at hadron colliders: transverse-momentum resummation at next-to-next-to-leading logarithmic accuracy

We consider the transverse-momentum (qT) distribution of a diphoton pair produced in hadron collisions. At small values of qT , we resum the logarithmically-enhanced perturbative QCD contributions up to next-to-next-to-leading logarithmic accuracy. At intermediate and large values of qT, we consistently combine resummation with the known next-to-leading order perturbative result. All perturbative terms up to order \alpha_S^2 are included in our computation which, after integration over qT, reproduces the known next-to-next-to-leading order result for the diphoton pair production total cross section. We present a comparison with LHC data and an estimate of the perturbative accuracy of the theoretical calculation by performing the corresponding variation of scales. In general we observe that the effect of the resummation is not only to recover the predictivity of the calculation at small transverse momentum, but also to improve substantially the agreement with the experimental data.Comment: 17 pages, 16 figures. arXiv admin note: text overlap with arXiv:1007.235

Representing Strategic International Human Resource Management: Is the Map the Territory?

This paper is focused on the emergent field of strategic international human resource management (SIHRM). We suggest that SIHRM is becoming an integrated intellectual map in terms of: (1) the typologies created; (2) the language used; and (3) its pedagogy. Does the way in which we articulate SIHRM assist theory development or enact intellectual imperialism? Or both? It is argued that, by exploring the implications of SIHRM for theory, research, practice and teaching, we may raise awareness of current deficiencies and unanswered questions. Do we need to set a new course, or at least make explicit our navigational assumptions

How New Venture Initial Public Offerings Benefit from International Operations: A Study of Human Resource Value

When internationalization goes beyond simply having international sales to having international operations, organizations can benefit from diversity of ideas and knowledge. Our study focuses on a special class of companies called new venture firms. As younger organizations, they may be well equipped to embrace the unique benefits of international diversity. However, new ventures may not be equal in this regard; therefore, our study also explores the moderating effect of human resource value for these firms

Global Human Resource Metrics

[Excerpt] What is the logic underlying global human resources (HR) measurement in your organization? In your organization, do you measure the contribution of global HR programs to organizational performance? Do you know what is the most competitive employee mix, e.g., proportion of expatriates vs. local employees, for your business units? (How) do you measure the cost and value of the different types of international work performed by your employees? In the globalized economy, organizations increasingly derive value from human resources, or “talent” as we shall also use the term here (Boudreau, Ramstad & Dowling, in press). The strategic importance of the workforce makes decisions about talent critical to organizational success. Informed decisions about talent require a strategic approach to measurement. However, measures alone are not sufficient, for measures without logic can create information overload, and decision quality rests in substantial part on the quality of measurements. An important element of enhanced global competitiveness is a measurement model for talent that articulates the connections between people and success, as well as the context and boundary conditions that affect those connections. This chapter will propose a framework within which existing and potential global HR measures can be organized and understood. The framework reflects the premise that measures exist to support and enhance decisions, and that strategic decisions require a logical connection between decisions about resources, such as talent, and the key organizational outcomes affected by those decisions. Such a framework may provide a useful mental model for both designers and users of HR measures

When Big Isn’t Better: Why Smaller International Initial Public Offering Firms Seem to Win

There is a considerable amount of research suggesting that “being international” is better. While that may be the case, the assumption remains tenuous at best, and research that considers organizational size provides results contesting this assumption. In particular, we explore the effect of having international sales and operations on both long and short-term performance of initial public offering (IPO) firms. We also explore the “size” phenomenon evident in prior research that suggests smaller firms seem to perform better when they are international than do medium size firms. By applying work from the field of human resource management, we suggest that the ‘size’ phenomenon may be related to the level of structural cohesion in the organization. Our longitudinal study supports the hypothesis that international companies with higher levels of structural cohesion are more successful

Diphoton production at hadron colliders: a fully-differential QCD calculation at NNLO

We consider direct diphoton production in hadron collisions, and we compute the next-to-next-to-leading order (NNLO) QCD radiative corrections at the fully-differential level. Our calculation uses the $q_T$ subtraction formalism and it is implemented in a parton level Monte Carlo program. The program allows the user to apply arbitrary kinematical cuts on the final-state photons and the associated jet activity, and to compute the corresponding distributions in the form of bin histograms. We present selected numerical results related to Higgs boson searches at the LHC and corresponding results at the Tevatron.Comment: Numerical error at NNLO corrected and corresponding results updated. Reference added to numerical code 2gNNL

Vector boson production at hadron colliders: a fully exclusive QCD calculation at NNLO

We consider QCD radiative corrections to the production of W and Z bosons in hadron collisions. We present a fully exclusive calculation up to next-to-next-to-leading order (NNLO) in QCD perturbation theory. To perform this NNLO computation, we use a recently proposed version of the subtraction formalism. The calculation includes the gamma-Z interference, finite-width effects, the leptonic decay of the vector bosons and the corresponding spin correlations. Our calculation is implemented in a parton level Monte Carlo program. The program allows the user to apply arbitrary kinematical cuts on the final-state leptons and the associated jet activity, and to compute the corresponding distributions in the form of bin histograms. We show selected numerical results at the Tevatron and the LHC.Comment: 7 pages, 3 ps figure

The ‘expat factor’: the influence of working time on women's decisions to undertake international assignments in the oil and gas industry

This article examines the effect of working time on women’s willingness to go on expatriate assignments in the oil and gas exploration and production sector. The research draws upon an analysis of two case study firms’ international assignment and working time policies, semi-structured interviews with 14 Human Resource staff responsible for policy design and implementation, and a survey of the views of 71 women expatriates, supported by in-depth interviews with 26 of the survey respondents. The research identifies an ‘expat factor’: assignees state that long hours are inherent in expatriation and necessary to further their careers. However in practice, working time is not excessive and flexible working practices are utilised. Hours of work have little effect on women’s decisions to undertake long-term assignments but alternatives such as short-term and commuter assignments are unpopular as their working patterns are disruptive to family life. This article contributes to theory development by linking two discrete frameworks that explain women’s career choices when they strive to balance their career goals with their families and by identifying a career compromise threshold when expatriation is rejected in favour of family considerations. A model is proposed to link working time/patterns to women’s international assignment participation

Vector boson production at hadron colliders: hard-collinear coefficients at the NNLO

We consider QCD radiative corrections to vector-boson production in hadron collisions. We present the next-to-next-to-leading order (NNLO) result of the hard-collinear coefficient function for the all-order resummation of logarithmically-enhanced contributions at small transverse momenta. The coefficient function controls NNLO contributions in resummed calculations at full next-to-next-to-leading logarithmic accuracy. The same coefficient function is used in applications of the subtraction method to perform fully-exclusive perturbative calculations up to NNLO.Comment: 13, pages, no figures. arXiv admin note: text overlap with arXiv:1106.465