272 research outputs found

    Accurate QCD predictions for heavy-quark jets at the Tevatron and LHC

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    Heavy-quark jets are important in many of today's collider studies and searches, yet predictions for them are subject to much larger uncertainties than for light jets. This is because of strong enhancements in higher orders from large logarithms, ln(p_t/m_Q). We propose a new definition of heavy-quark jets, which is free of final-state logarithms to all orders and such that all initial-state collinear logarithms can be resummed into the heavy-quark parton distributions. Heavy-jet spectra can then be calculated in the massless approximation, which is simpler than a massive calculation and reduces the theoretical uncertainties by a factor of three. This provides the first ever accurate predictions for inclusive b- and c-jets, and the latter have significant discriminatory power for the intrinsic charm content of the proton. The techniques introduced here could be used to obtain heavy-flavour jet results from existing massless next-to-leading order calculations for a wide range of processes. We also discuss the experimental applicability of our flavoured jet definition.Comment: 22 pages, 7 figure

    Combating Acid Violence in Bangladesh, India and Cambodia

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    This Report is the first comprehensive, comparative study of acid violence that examines the underlying causes, its consequences, and the multiple barriers to justice for its victims. Acid attacks, like other forms of violence against women, are not random or natural phenomena. Rather, they are social phenomena deeply embedded in a gender order that has historically privileged patriarchal control over women and justified the use of violence to “keep women in their places.” Through an in-depth study of three countries, the authors of the Report argue that the due diligence standard can be a powerful tool for state and non-state actors to prevent and adequately respond to acid violence with the aim of combating it. In this respect, they identify key ways in which acid violence can be addressed by governments and corporations

    Invisible Diaspora?:English Ethnicity in the United States before 1920

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    The article presents an examination into the English population of the United States during the 19th and early 20th centuries, examining their ethnic identity as a diaspora community. Introductory details are given noting the relative lack of attention given to English Americans as an ethnic group. Topics addressed include reasons behind the invisibility of the English immigrant identity in the U.S., the existence of English ethnic organizations, and an overview of their activities

    Present and Future CP Measurements

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    We review theoretical and experimental results on CP violation summarizing the discussions in the working group on CP violation at the UK phenomenology workshop 2000 in Durham.Comment: 104 pages, Latex, to appear in Journal of Physics

    The Global Reach of HIV/AIDS: Science, Politics, Economics, and Research

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    Schumpeter and Venture Finance: Radical Theorist, Broke Investor and Enigmatic Teacher

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    Schumpeter's relation to venture finance constitutes a fascinating yet so far unacknowledged chapter of his biography and financial history. Presenting new historical evidence and pointing out connections that have so far escaped attention, we first discuss Schumpeter's venture theory of money and banking, then his personal history as a broke investor in Vienna, and finally his influence on the emerging venture industry during his later years at Harvard. We show how the theoretical vision inspired his failed effort as a venture investor in the 1920s, and provided a powerful intellectual frame for the later development of venture finance in the 1940s
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