3,925 research outputs found

    Calorimeter Optimization and Heavy Higgs Reconstruction in ATLAS

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    Prospects for Measuring Vtb via s-channel Single Top at ATLAS

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    The production of single top quarks via the electroweak interaction promises to provide new opportunities to both test the Standard Model and search for new physics. In particular, electroweak top production provides the only means to directly measure the CKM matrix element Vtb at ATLAS. The s-channel has the lowest rate, but is the best theoretically understood mechanism of electroweak top production. An evaluation of the potential for background suppression and Vtb measurement in this channel is presented. It is found that significant background suppression can be achieved and Vtb can be measured in the s-channel to a statistical precision of 2.8% after 30 inverse femtobarns of integrated luminosity at the LHC

    Nonlinear saturation of electrostatic waves: mobile ions modify trapping scaling

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    The amplitude equation for an unstable electrostatic wave in a multi-species Vlasov plasma has been derived. The dynamics of the mode amplitude ρ(t)\rho(t) is studied using an expansion in ρ\rho; in particular, in the limit γ0+\gamma\rightarrow0^+, the singularities in the expansion coefficients are analyzed to predict the asymptotic dependence of the electric field on the linear growth rate γ\gamma. Generically Ekγ5/2|E_k|\sim \gamma^{5/2}, as γ0+\gamma\rightarrow0^+, but in the limit of infinite ion mass or for instabilities in reflection-symmetric systems due to real eigenvalues the more familiar trapping scaling Ekγ2|E_k|\sim \gamma^{2} is predicted.Comment: 13 pages (Latex/RevTex), 4 postscript encapsulated figures which are included using the utility "uufiles". They should be automatically included with the text when it is downloaded. Figures also available in hard copy from the authors ([email protected]
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