76,913 research outputs found

    Songs From Wilhelm Tell

    Get PDF
    The following selections are translated from the German of the first three songs from Wilhelm Tell, by Friedrich Schiller

    Diphotons from Tetraphotons in the Decay of a 125 GeV Higgs at the LHC

    Full text link
    Recently the ATLAS and CMS experiments have presented data hinting at the presence of a Higgs boson at mh125m_h\simeq125 GeV. The best-fit hγγh\rightarrow\gamma\gamma rate averaged over the two experiments is approximately 2.1±0.52.1\pm0.5 times the Standard Model prediction. We study the possibility that the excess relative to the Standard Model is due to haah\rightarrow aa decays, where aa is a light pseudoscalar that decays predominantly into γγ\gamma\gamma. Although this process yields 4γ4\gamma final states, if the pseudoscalar has a mass of the order tens of MeV, the two photons from each aa decay can be so highly collimated that they may be identified as a single photon. Some fraction of the events then contribute to an effective hγγh\rightarrow\gamma\gamma signal. We study the constraints on the parameter space where the net hγγh\rightarrow\gamma\gamma rate is enhanced over the Standard Model by this mechanism and describe some simple models that give rise to the pseudoscalar-photon interaction. Further tests and prospects for searches in the near future are discussed.Comment: 14 pages, 7 figures, revtex4-1; v2: references added and rearranged, g-2 limit improved, published version; v3: typos correcte

    Co-clustering separately exchangeable network data

    Full text link
    This article establishes the performance of stochastic blockmodels in addressing the co-clustering problem of partitioning a binary array into subsets, assuming only that the data are generated by a nonparametric process satisfying the condition of separate exchangeability. We provide oracle inequalities with rate of convergence OP(n1/4)\mathcal{O}_P(n^{-1/4}) corresponding to profile likelihood maximization and mean-square error minimization, and show that the blockmodel can be interpreted in this setting as an optimal piecewise-constant approximation to the generative nonparametric model. We also show for large sample sizes that the detection of co-clusters in such data indicates with high probability the existence of co-clusters of equal size and asymptotically equivalent connectivity in the underlying generative process.Comment: Published in at http://dx.doi.org/10.1214/13-AOS1173 the Annals of Statistics (http://www.imstat.org/aos/) by the Institute of Mathematical Statistics (http://www.imstat.org

    Guest Editorial: One Size Does Not Fit All, One Critique Does Not Fit All Schools of Education

    Full text link
    Many years ago, Dr. Martin Luther King reminded us that skin tone should never be a factor to judge an individual, but rather the content of the individual’s character is the issue to be considered. Just a few years ago the sociologists Lawrence Harrington and Samuel Huntington (2000) completed a study which addresses Max Weber’s premise that culture does matter when looking at the differing levels of societal effectiveness. As we read Dr. Arthur Levine’s Educating School Leaders, we question if Dr. Levine has operated from the understanding that the differences in schools of education are numerous and that each must be evaluated based on the content and outputs of their programs

    Odious Debts or Odious Regimes

    Get PDF
    Odious regimes have always been there. That there is no silver-bullet solution that will prevent odious regimes from arising, or stymie them once they do, is evident from the plethora of responses employed by the international community once a regime\u27s odiousness becomes clear. Current odious debt doctrine dates back to a 1927 treatise by a wandering Russian academic named Alexander Sack. The Sack definition contemplates a debt-by-debt approach to questionable borrowing. If a loan is used to benefit the population--to build a highway or water-treatment plant, for instance--the obligation would be fully enforceable, no matter how pernicious the borrower regime. Here, Bolton and Skeel attempt to fill the vacuum: a regime is odious if it engages in either systematic suppression or systematic looting

    Beyond Scope of Practice: Inferring High School Tennis Coaches' Behavior from their Nutrition and Eating Disorder Knowledge

    Get PDF
    The primary purpose of this study was to assess high school tennis coaches’ knowledge of macronutrients and disordered eating (e.g., etiology). Other purposes included identifying confidence in knowledge and any differences between the participating coaches’ knowledge and demographic variables. To address these purposes, the 27-question Nutrition and Eating Disorders in Tennis (“NET”) Survey was created. The study design involved a one-time voluntary assessment of the Indiana coaches’ demographic variables, knowledge, sources of knowledge, and level of confidence (e.g., Not At All or Very Confident). Overall, the results revealed that the coaches lacked knowledge. The average score was 70.6%, which was below the criterion for adequate knowledge. Furthermore, the coaches lacked adequate knowledge in three of the five knowledge domains: Treatment and Prevention of Disordered Eating (63.6% ± 22.9%), Disordered Eating Signs and Symptoms (60.0% ± 21.7%), and Macronutrients (57.0% ± 22.4%). There were no significant differences between coaches’ education level, gender, or type and knowledge. However, there was in experience; the more years coached, the lower the scores. Finally, there was a trend of overconfidence in answers
    corecore