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Results of a search for physics beyond the Standard Model in events containing an energetic photon and large missing transverse momentum with the ATLAS detector at the Large Hadron Collider are reported. As the number of events observed in data, corresponding to an integrated luminosity of 36.1 $\textrm fb^{-1}$ of proton-proton collisions at a centre-of-mass energy of 13 TeV, is in agreement with the Standard Model expectations, exclusion limits in models where dark-matter candidates are pair-produced are determined. For dark-matter production via an axial-vector or a vector mediator in the s-channel, this search excludes mediator masses below 750-1200 GeV for dark-matter candidate masses below 230-480 GeV at 95% confidence level, depending on the couplings. In an effective theory of dark-matter production, the limits restrict the value of the suppression scale $M_{*}$ to be above 790 GeV at 95% confidence level. A limit is also reported on the production of a high-mass scalar resonance by processes beyond the Standard Model, in which the resonance decays to $Z\gamma$ and the Z boson subsequently decays into neutrinos. The European physical journal / C 77(6), 393 (2017). doi:10.1140/epjc/s10052-017-4965-8 Published by Springer, Berlin
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handle: 10419/227751
The possibility of electric vehicles to technically replace internal combustion engine vehicles and to deliver economic benefits mainly depends on the battery and the charging infrastructure as well as on annual mileage (utilizing the lower variable costs of electric vehicles). Current studies on electric vehicles’ total cost of ownership often neglect two important factors that influence the investment decision and operational costs: firstly, the trade-off between battery and charging capacity; secondly the uncertainty in energy consumption. This paper proposes a two-stage stochastic program that minimizes the total cost of ownership of a commercial electric vehicle under uncertain energy consumption and available charging times induced by mobility patterns and outside temperature. The optimization program is solved by sample average approximation based on mobility and temperature scenarios. A hidden Markov model is introduced to predict mobility demand scenarios. Three scenario reduction heuristics are applied to reduce computational effort while keeping a high-quality approximation. The proposed framework is tested in a case study of the home nursing service. The results show the large influence of the uncertain mobility patterns on the optimal solution. In the case study, the total cost of ownership can be reduced by up to 3.9% by including the trade-off between battery and charging capacity. The introduction of variable energy prices can lower energy costs by 31.6% but does not influence the investment decision in this case study. Overall, this study provides valuable insights for real applications to determine the techno-economic optimal electric vehicle and charging infrastructure configuration.
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handle: 10419/25176
This article analyses shock and volatility transmission between the foreign exchange, money and stock markets in Asian Pacific countries from 1999 to 2006. The proposed methodology achieves identification of the simultaneous equation systems by modelling the high-frequency heteroscedasticity of the structural disturbances in multivariate Exponential Generalized Autoregressive Conditional Heteroscedasticity (EGARCH) processes. The procedure avoids exclusion restrictions, considers volatility spillover and guarantees positive definite covariance-matrices. Important results include the key issues of monetary policy reactions to financial shocks, the potential of exchange rate stabilization strategies or equity market responses to interest and exchange rate developments. Additionally, regional coherence of the structural financial innovations is explored.
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citations | 12 | |
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influence | Average | |
impulse | Top 10% |
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The natural linear programming formulation of the maximum s-t-flow problem in path-variables has a dual linear program whose underlying polyhedron is the dominant of the s-t-cut polytope. We present a complete characterization of this polyhedron with respect to vertices, facets, and adjacency.
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doi: 10.1007/jhep11(2018)042 , 10.3204/pubdb-2018-05797 , 10.18154/rwth-2019-11936 , 10.3204/pubdb-2018-02198 , 10.5445/ir/1000087615 , 10.18154/rwth-2019-11905 , 10.48550/arxiv.1805.06013
handle: 10651/50744 , 11588/729942 , 11368/2931346 , 20.500.12881/8155 , 20.500.12960/948 , 10281/286506 , 10446/145264 , 10679/6173 , 10067/1554280151162165141 , 11492/3891 , 11577/3284331 , 11573/1357473 , 11584/288636 , 11567/952024 , 11568/947108 , 20.500.14017/60e11b22-5893-40e5-8a67-019b8c8287cb , 11589/210436 , 11391/1450175 , 11585/670192 , 20.500.11769/358958 , 20.500.12605/36852 , 2158/1176366 , 1854/LU-8592175 , 2318/1693491 , 11579/108068 , 11586/229366 , 11449/186488 , 1721.1/119253 , 2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/299446 , 11563/135521 , 10044/1/64743
doi: 10.1007/jhep11(2018)042 , 10.3204/pubdb-2018-05797 , 10.18154/rwth-2019-11936 , 10.3204/pubdb-2018-02198 , 10.5445/ir/1000087615 , 10.18154/rwth-2019-11905 , 10.48550/arxiv.1805.06013
handle: 10651/50744 , 11588/729942 , 11368/2931346 , 20.500.12881/8155 , 20.500.12960/948 , 10281/286506 , 10446/145264 , 10679/6173 , 10067/1554280151162165141 , 11492/3891 , 11577/3284331 , 11573/1357473 , 11584/288636 , 11567/952024 , 11568/947108 , 20.500.14017/60e11b22-5893-40e5-8a67-019b8c8287cb , 11589/210436 , 11391/1450175 , 11585/670192 , 20.500.11769/358958 , 20.500.12605/36852 , 2158/1176366 , 1854/LU-8592175 , 2318/1693491 , 11579/108068 , 11586/229366 , 11449/186488 , 1721.1/119253 , 2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/299446 , 11563/135521 , 10044/1/64743
Abstract A search in energetic, high-multiplicity final states for evidence of physics beyond the standard model, such as black holes, string balls, and electroweak sphalerons, is presented. The data sample corresponds to an integrated luminosity of 35.9 fb−1 collected with the CMS experiment at the LHC in proton-proton collisions at a center-of-mass energy of 13 TeV in 2016. Standard model backgrounds, dominated by multijet production, are determined from control regions in data without any reliance on simulation. No evidence for excesses above the predicted background is observed. Model-independent 95% confidence level upper limits on the cross section of beyond the standard model signals in these final states are set and further interpreted in terms of limits on semiclassical black hole, string ball, and sphaleron production. In the context of models with large extra dimensions, semiclassical black holes with minimum masses as high as 10.1 TeV and string balls with masses as high as 9.5 TeV are excluded by this search. Results of the first dedicated search for electroweak sphalerons are presented. An upper limit of 0.021 is set at 95% confidence level on the fraction of all quark-quark interactions above the nominal threshold energy of 9 TeV resulting in the sphaleron transition.
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gold |
citations | 19 | |
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influence | Average | |
impulse | Top 10% |
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doi: 10.17877/de290r-5377
handle: 2003/29648
The classical Heckman (1976, 1979) selection correction estimator (heckit) is misspecified and inconsistent if an interaction of the outcome variable and an explanatory variable matters for selection. To address this specification problem, a full information maximum likelihood estimator and a simple two-step estimator are developed. Monte-Carlo simulations illustrate that the bias of the ordinary heckit estimator is removed by these generalized estimation procedures. Along with OLS and the ordinary heckit procedure, we apply these estimators to data from a randomized trial that evaluates the effectiveness of financial incentives for weight loss among the obese. Estimation results indicate that the choice of the estimation procedure clearly matters. Discussion Paper / SFB 823;40/2012
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In Geng, Weiss, and Wolff (2011), we pointed to the possibility that a voting mechanism may create or strengthen an entitlement eff ect in political-power holders relative to a random-appointment mechanism. This comment documents that such an eff ect, if it exists, is not robust. published