9,510 research outputs found

    750 GeV Diphotons from a D3-brane

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    Motivated by the recently reported diphoton excess at 750 GeV observed by both CMS and ATLAS, we study string-based particle physics models which can accommodate this signal. Quite remarkably, although Grand Unified Theories in F-theory tend to impose tight restrictions on candidate extra sectors, the case of a probe D3-brane near an E-type Yukawa point naturally leads to a class of strongly coupled models capable of accommodating the observed signature. In these models, the visible sector is realized by intersecting 7-branes, and the 750 GeV resonance is a scalar modulus associated with motion of the D3-brane in the direction transverse to the Standard Model 7-branes. Integrating out heavy 3-7 string messenger states leads to dimension five operators for gluon fusion production and diphoton decays. Due to the unified structure of interactions, these models also predict that there should be additional decay channels to ZZ and Z gamma. We also comment on models with distorted unification, where both the production mechanism and decay channels can differ.Comment: v3: 12 pages, 1 figure, clarifications adde

    China's Investment in Human Capital

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    This paper discusses evidence on human capital investment in China. Policies through the mid 1990s favor physical investment over schooling.

    The Case for Investing in Disadvantaged Young Children

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    Bildung, Kinder, Pädagogik, Bildungspolitik, Bildungsinvestition, Education, Children, Education sciences, Educational policy, Human capital investment

    The Impact of Government on the Economic Status of Black Americans

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    This paper reviews recent evidence on black economic progress. It notes that while relative status increased over the period 1965-1981, absolute differentials in real earnings between blacks and whites widened over this period. The paper goes out to summarize recent studies of the impact of government on the economic status of black Americans. Educational policy has a strong effect. The evidence on affirmative action programs is mixed. There is an intrinsic bias in the methods used toward finding no effect of affirmative action programs. Selection bias effects do not account for more than 10-12% of measured wage growth of black males.

    Integrating Personality Psychology into Economics

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    This paper reviews the problems and potential benefits of integrating personality psychology into economics. Economists have much to learn from and contribute to personality psychology.personality psychology, behavioral economics, identification, causality

    Studies in Labor Markets

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