175 research outputs found

    Measurement of the Z/gamma* + b-jet cross section in pp collisions at 7 TeV

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    The production of b jets in association with a Z/gamma* boson is studied using proton-proton collisions delivered by the LHC at a centre-of-mass energy of 7 TeV and recorded by the CMS detector. The inclusive cross section for Z/gamma* + b-jet production is measured in a sample corresponding to an integrated luminosity of 2.2 inverse femtobarns. The Z/gamma* + b-jet cross section with Z/gamma* to ll (where ll = ee or mu mu) for events with the invariant mass 60 < M(ll) < 120 GeV, at least one b jet at the hadron level with pT > 25 GeV and abs(eta) < 2.1, and a separation between the leptons and the jets of Delta R > 0.5 is found to be 5.84 +/- 0.08 (stat.) +/- 0.72 (syst.) +(0.25)/-(0.55) (theory) pb. The kinematic properties of the events are also studied and found to be in agreement with the predictions made by the MadGraph event generator with the parton shower and the hadronisation performed by PYTHIA.Comment: Submitted to the Journal of High Energy Physic

    Perturbed nonlocal fourth order equations of Kirchhoff type with Navier boundary conditions

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    Abstract We investigate the existence of multiple solutions for perturbed nonlocal fourth-order equations of Kirchhoff type under Navier boundary conditions. We give some new criteria for guaranteeing that the perturbed fourth-order equations of Kirchhoff type have at least three weak solutions by using a variational method and some critical point theorems due to Ricceri. We extend and improve some recent results. Finally, by presenting two examples, we ensure the applicability of our results

    Globalisation, accounting and developing countries

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    Accounting is an instrument and an object in globalisation but its impact and manifestation is not uniform across Northern developed countries and Southern developing countries (DCs). This paper reviews contributions on globalisation and its influence on accounting in DCs, and identifies important research gaps. It examines the role of accounting in changing development policies, from state capitalism through neo-liberal market-based to good-governance policies. It then considers specific accounting issues, namely the diffusion of International Accounting Standards (now International Financial Reporting Standards) and how they promote global neo-liberalism; the development of the accounting profession in DCs in the face of competition from Northern global accounting firms and professional associations; accounting issues in state-owned organisations, and privatised and multinational corporations; government accounting reforms and the resurrection of the state in DCs; social and environmental accounting issues; and the rise of non-governmental organisations and their accounting and accountability. The discussion and conclusions reflect on achievements to date and important areas requiring further development

    Searches for electroweak production of charginos, neutralinos, and sleptons decaying to leptons and W, Z, and Higgs bosons in pp collisions at 8 TeV

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    Peer reviewe

    Measurement of prompt J/ψ pair production in pp collisions at √s = 7 Tev

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