71 research outputs found

    Direct detection of dark matter in models with a light Z'

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    We discuss the direct detection signatures of dark matter interacting with nuclei via a Z' mediator, focussing on the case where both the dark matter and the ZZ' have mass of a few GeV. Isospin violation (i.e. different couplings to protons and neutrons) arises naturally in this scenario. In particular it is possible to reconcile the preferred parameter regions inferred from the observed DAMA and CoGeNT modulations with the bounds from XENON100, which requires f_n/f_p = -0.7. Moreover, the Z' mediator can also yield a large spin-dependent cross-section which could contribute to the DAMA signal, while the spin-independent cross-section is adequate to explain the CoGeNT signal.Comment: 20 pages, 3 figures. v2: matches published versio

    Heavy colored resonances in top-antitop + jet at the LHC

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    The LHC is the perfect environment for the study of new physics in the top quark sector. We study the possibility of detecting signals of heavy color-octet vector resonances, through the charge asymmetry, in top-antitop+jet events. Besides contributions with the top-antitop pair in a color-singlet state, the asymmetry gets also contributions which are proportional to the color factor f_{abc}^2. This process is particularly interesting for extra-dimensional models, where the inclusive charge asymmetry generated by Kaluza-Klein excitations of the gluon vanishes at the tree level. We find that the statistical significance for the measurement of such an asymmetry is sizable for different values of the coupling constants and already at low energies

    A922 Sequential measurement of 1 hour creatinine clearance (1-CRCL) in critically ill patients at risk of acute kidney injury (AKI)

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    Potentials and feasibility assessment of small scale CHP plants fired by energy crops in Puglia region (Italy)

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    The proposed work aims to assess the energy crop suitability of Puglia Region (Southern Italy), the techno-economic feasibility of small scale CHPplants fired by energy crops, and the environmental performances of the proposed CHP plants. In the first part of the work, a GIS model is defined and applied to evaluate the land suitability for energy crops in the Puglia region. In the second part, a financial appraisal of small scale CHP plants under Italian legislative framework (feed in tariffs) is proposed; the two case studies of bio-oil fired internal combustion engine (ICE) coupled to vegetable oil mill plant and fed by oil seeds (brassica carinata seeds) and syngas fired engine coupled to a pellet production unit and fed by herbaceous energy crops bales (fibre sorghum) are investigated. In the third part, the energy balance and the CO emissions of the whole bioenergy routes are assessed, in order to calculate the costs for the community (in terms of subsidies) to save a tons oil equivalent (TOE) of primary energy and to avoid a tCO 2 in the atmosphere by these small scale routes. The results report a potential in Puglia Region of about 293 and 729 kt y 2 of brassica carinata seeds and fibre sorghum bales, respectively; the financial appraisal of the proposed chains, under the Italian legislative framework, reports an internal rate of return (IRR) of 38% and 17%, respectively, while the energy balance assessment reports an overall efficiency of the bioenergy routes of 2.72 and 2.95, respectively
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