A search for ttbar resonances in the dilepton channel in 1.04/fb of pp collisions at sqrt(s) = 7 TeV with the ATLAS detector

The first ATLAS result on a search for a high mass top pair resonance at the LHC, in the subset of events where both W bosons from the top decays decay to either a final state electron or muon, is presented. The analysis is performed on 1.04/fb of pp collisions at sqrt(s) = 7 TeV. Numerous models predict the production of new massive particles that decay preferentially to a top-anti-top pair, including Randall-Sundrum models where the observation of a Kaluza-Klein excitation of the gluon may be the first indication of the existence of an extra spatial dimension. In the analysis presented, a simple observable, sensitive to resonance mass, is formed by summing the missing transverse energy, and the transverse momenta of the selected jets and the two candidate leptons. A deviation from the Standard Model prediction for this observable is searched for using Bayesian statistical methods that compare the yields, and shapes, of the Standard Model background and signal predictions for KK-gluons with masses between 500 and 1600 GeV. No excess over the Standard Model is observed and 95% C.L. upper limits are set on the production cross-section times branching ratio to top quarks for KK-gluon-like resonances. The results of the analysis exclude Randall-Sundrum KK-gluons with masses less than 840 GeV.Comment: "Presented at the 2011 Hadron Collider Physics symposium (HCP-2011), Paris, France, November 14-18 2011, 3 pages, 4 figures.

Using network centrality measures to manage landscape connectivity

We use a graph-theoretical landscape modeling approach to investigate how to identify central patches in the landscape as well as how these central patches influence (1) organism movement within the local neighborhood, and (2) the dispersal of organisms beyond the local neighborhood. Organism movements were theoretically estimated based on the spatial configuration of the habitat patches in the studied landscape. We find that centrality depends on the way the graph-theoretical model of habitat patches is constructed, although even the simplest network representation, not taking strength and directionality of potential organisms flows into account, still provides a coarse-grained assessment of the most important patches according to their contribution to landscape connectivity. Moreover, we identify (at least) two general classes of centrality. One accounts for the local flow of organisms in the neighborhood of a patch and the other for the ability to maintain connectivity beyond the scale of the local neighborhood. Finally, we study how habitat patches with high scores on different network centrality measures are distributed in a fragmented agricultural landscape in Madagascar. Results show that patches with high degree-, and betweenness centrality are widely spread, while patches with high subgraph- and closeness centrality are clumped together in dense clusters. This finding may enable multi-species analyses of single-species network models

Guest Artist Recital:Stephen Swedish, Piano

Kemp Recital Hall Wednesday Evening February 28, 2001 8:00p.m

SND metadata profile: Language Resources

To make it easier for researchers from various fields to describe and share data, SND has developed several metadata profiles that are specific for certain fields, or topics. SND also offers a general profile to fit broader uses, and a profile for entry level data; a minimum metadata profile that fulfils the DataCite requirements to issue a DOI for a dataset. The Language resources profile also includes support for documenting resource and media types according to the META-SHARE metadata model: http://www.meta-share.org/p/93/Documentation#modeFunded by the Swedish Research Council

SND metadata profile: Engineering and Technology

To make it easier for researchers from various fields to describe and share data, SND has developed several metadata profiles that are specific for certain fields, or topics. SND also offers a general profile to fit broader uses, and a profile for entry level data; a minimum metadata profile that fulfils the DataCite requirements to issue a DOI for a dataset.Funded by the Swedish Research Council