6,285 research outputs found

    Can Electro-Weak \h-Term be Observable ?

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    We rederive and discuss the result of the previous paper that in the standard model θ\theta-term related to WW-boson field can not be induced by weak instantons. This follows from the existence of the fermion zero mode in the instanton field even when Yukawa couplings are switched on and there are no massless particles. We consider the new index theorem connecting the topological charge of the weak gauge field with the number of fermion zero modes of a certain differential operator which depends not only on gauge but also on Higgs fields. The possible generalizations of the standard model are discussed which lead to nonvanishing weak θ\theta-term. In SU(2)L×SU(2)RSU(2)_L \times SU(2)_R model the θ\theta dependence of the vacuum energy is computed.Comment: 21 pages, Preprint TPI-MINN-93/24-

    Germanification, cultural mission, holocaust: theatre in Łódź during World War II

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    Support Vector Machines in High Energy Physics

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    This lecture will introduce the Support Vector algorithms for classification and regression. They are an application of the so called kernel trick, which allows the extension of a certain class of linear algorithms to the non linear case. The kernel trick will be introduced and in the context of structural risk minimization, large margin algorithms for classification and regression will be presented. Current applications in high energy physics will be discussed.Comment: 11 pages, 12 figures. Part of the proceedings of the Track 'Computational Intelligence for HEP Data Analysis' at iCSC 200

    Measurement of Transverse Spin Effects at COMPASS

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    By measuring transverse single spin asymmetries one has access to the transversity distribution function ΔTq(x)\Delta_T q(x) and the transverse momentum dependent Sivers function q0T(x,kT)q_0^T(x,\vec{k}_T). New measurements from identified hadrons and hadron pairs, produced in deep inelastic scattering of a transversely polarized 6LiD^6LiD target are presented. The data were taken in 2003 and 2004 by the COMPASS collaboration using the muon beam of the CERN SPS at 160 GeV/c, resulting in small asymmetries.Comment: 4 pages, 7 figures, in proceedings for 'Rencontres de Moriond 2007, QCD and Hadronic interactions

    Review of Rebecca Rovit, The Jewish Kulturbund Theatre Company in Nazi Berlin. Iowa: University of Iowa Press, 2012.

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    Review of Jost Hermand, Culture in Dark Times: Nazi Fascism, Inner Emigration, and Exile. New York: Berghahn, 2013.

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    Basics of Feature Selection and Statistical Learning for High Energy Physics

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    This document introduces basics in data preparation, feature selection and learning basics for high energy physics tasks. The emphasis is on feature selection by principal component analysis, information gain and significance measures for features. As examples for basic statistical learning algorithms, the maximum a posteriori and maximum likelihood classifiers are shown. Furthermore, a simple rule based classification as a means for automated cut finding is introduced. Finally two toolboxes for the application of statistical learning techniques are introduced.Comment: 12 pages, 8 figures. Part of the proceedings of the Track 'Computational Intelligence for HEP Data Analysis' at iCSC 200

    Review of Karen Eliot, Albion's Dance: British Ballet During the Second World War

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    The production of a non-homogeneous classical pion field and the distribution of the neutral and charged pions

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    The probability distribution dw/dfdw/df as a function of the ratio f=n0/ntotf=n_0/n_{tot} of the neutral to total multiplicities is calculated for the classical pion fields quickly varying in space and time.Comment: 6 pages, 1 .eps figure, using epsfig, submitted to Phys.Let
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