16 research outputs found

    Measurement of the double-differential high-mass Drell-Yan cross section in pp collisions at √s = 8 TeV with the ATLAS detector

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    This paper presents a measurement of the double-differential cross section for the Drell-Yan Z/γ∗ → ℓ+ℓ− and photon-induced γγ → ℓ+ℓ− processes where ℓ is an electron or muon. The measurement is performed for invariant masses of the lepton pairs, mℓℓ, between 116 GeV and 1500 GeV using a sample of 20.3 fb−1 of pp collisions data at centre-of-mass energy of √s = 8 TeV collected by the ATLAS detector at the LHC in 2012. The data are presented double differentially in invariant mass and absolute dilepton rapidity as well as in invariant mass and absolute pseudorapidity separation of the lepton pair. The single-differential cross section as a function of mℓℓ is also reported. The electron and muon channel measurements are combined and a total experimental precision of better than 1% is achieved at low mℓℓ. A comparison to next-to-next-to-leading order perturbative QCD predictions using several recent parton distribution functions and including next-to-leading order electroweak effects indicates the potential of the data to constrain parton distribution functions. In particular, a large impact of the data on the photon PDF is demonstrated

    Search for exclusive Higgs and Z boson decays to ϕγ and ργ with the ATLAS detector

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    A search for the exclusive decays of the Higgs and Z bosons to a φ or ρ meson and a photon is performed with a pp collision data sample corresponding to an integrated luminosity of up to 35.6 fb−1 collected at √s = 13 TeV with the ATLAS detector at the CERN Large Hadron Collider. These decays have been suggested as a probe of the Higgs boson couplings to light quarks. No significant excess of events is observed above the background, as expected from the Standard Model. Upper limits at 95% confidence level were obtained on the branching fractions of the Higgs boson decays to φγ and ργ of 4.8 × 10−4 and 8.8 × 10−4, respectively. The corresponding 95% confidence level upper limits for the Z boson decays are 0.9 × 10−6 and 25 × 10−6 for φγ and ργ, respectively

    The new comparative economic history: Essays in honor of Jeffrey G. Williamson

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    Copyright © 2008 John Wiley & Sons, IncIan W. McLea

    Friendship and organization: Learning from the western friendship tradition

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    This article describes and explores some key concepts from the classical, Western friendship tradition in order to see whether anything may be learned from them about the processes of organizing today. First, it looks at the difference between the modern notion of friendship, which emphasizes intimacy as the basis for an interpersonal relationship, and the classical tradition, which held a much more differentiated view, extending from the interpersonal to the political and systemic. In particular, the idea of friendship as a hexis is described – that is, as a state of mind or disposition towards others rather than just an intimate relationship. Second, it looks at the idea of ‘levels’ of friendship – from those based on utility or pleasure to those rooted in a striving after virtue – which opens up possibilities for analysing the culture of human relationships in organizations. Finally, it examines ways in which these ideas might be applied in organizations through the elaboration of the practices of friendship in the context of levels of friendship and of the idea of friendship as a state of mind. © 2007 Taylor and Francis Group, LLC
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