Going for Gold

In September 2011 Morningstar launched its qualitative forward-looking analyst ratings to supplement its widely followed backward-looking star ratings. This new system is designed to convey information about a mutual fund’s future performance using a five-tier scale: Gold, Silver, Bronze, Neutral, and Negative. We examine both the investor response to analyst rating initiations and the out-of-sample performance of newly rated funds. We find that investors respond positively to Gold and Silver rated funds relative to other rated funds. We find little evidence that the new rating system identifies funds that outperform peer funds at horizons of up to 6 months. Overall, it appears that rating initiations influence investor allocation decisions, but it remains unclear whether the ratings provide valuable information regarding long-term, out-of-sample performance

History of solar oblateness measurements and interpretation

International audienc

Measurement of the isolated diphoton cross-section in pp collisions at sqrt(s) = 7 TeV with the ATLAS detector

The ATLAS experiment has measured the production cross-section of events with two isolated photons in the final state, in proton-proton collisions at sqrt(s) = 7 TeV. The full data set acquired in 2010 is used, corresponding to an integrated luminosity of 37 pb^-1. The background, consisting of hadronic jets and isolated electrons, is estimated with fully data-driven techniques and subtracted. The differential cross-sections, as functions of the di-photon mass, total transverse momentum and azimuthal separation, are presented and compared to the predictions of next-to-leading-order QCD.Comment: 15 pages plus author list (27 pages total), 9 figures, 2 tables, final version to appear in Physical Review

Search for Diphoton Events with Large Missing Transverse Energy in 7 TeV Proton-Proton Collisions with the ATLAS Detector

A search for diphoton events with large missing transverse energy is presented. The data were collected with the ATLAS detector in proton-proton collisions at √s=7  [square root of s=7] TeV at the CERN Large Hadron Collider and correspond to an integrated luminosity of 3.1  pb-1 [pb superscript -1]. No excess of such events is observed above the standard model background prediction. In the context of a specific model with one universal extra dimension with compactification radius R and gravity-induced decays, values of 1/R<729  GeV are excluded at 95% C. L., providing the most sensitive limit on this model to date.United States. Dept. of EnergyNational Science Foundation (U.S.