PACS. 71.27+a -Strongly correlated electron systems; heavy fermions. PACS. 71.30+h -Metal-insulator transitions and other electronic transitions.Abstract. -The two-dimensional Hubbard model with a bimodal distribution of on-site interactions, P (U i ) = (1− f)δ(U i − U) + fδ(U i ), is studied using finite-temperature Quantum Monte Carlo and dynamical mean-field theory. Long-range antiferromagnetic order off half-filling is stabilized by the disorder, due to localization of the dopants on the U = 0 sites. Whereas in the clean model there is a single gap at n = 1, for nonzero f we find the compressibility and density of states exhibit gaps at two separate fillings.
We study the sources of systematic errors in the measurement of the Z → ℓ + ℓ − cross-sections at the LHC. We consider the systematic errors in both the total cross-section and acceptance for anticipated experimental cuts. We include the best available analysis of QCD effects at NNLO in assessing the effect of higher order corrections and PDF and scale uncertainties on the theoretical acceptance. In addition, we evaluate the error due to missing NLO electroweak corrections and propose which MC generators and computational schemes should be implemented to best simulate the events.
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