159,533 research outputs found

    Effective Field Theory for Nuclear Physics

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    I summarize the motivation for the effective field theory approach to nuclear physics, and highlight some of its recent accomplishments. The results are compared with those computed in potential models.Comment: Talk delivered at Baryons '98, Bonn, Sept. 22, 1998. 15 pages, 9 figure

    Nucleon-Nucleon Scattering and Effective Field Theory: Including Pions Non-perturbatively

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    Next to leading order effective field theory calculations are performed for 1S0 {}^1S_0 NN scattering using subtractive renormalization procedure. One pion exchange and contact interaction potentials are iterated using Lippman-Schwinger equation. Satisfactory fit to the Nijmegen data is obtained for the momenta up to 300 MeV in the centre of mass frame. Phase shifts are also compared with the results of KSW approach where pions are included perturbatively.Comment: 7 pages, 3 figures, references added, to appear in Phys. Lett.

    The Role of the Law in Drug Control

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    Weight enumerators of Reed-Muller codes from cubic curves and their duals

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    Let Fq\mathbb{F}_q be a finite field of characteristic not equal to 22 or 33. We compute the weight enumerators of some projective and affine Reed-Muller codes of order 33 over Fq\mathbb{F}_q. These weight enumerators answer enumerative questions about plane cubic curves. We apply the MacWilliams theorem to give formulas for coefficients of the weight enumerator of the duals of these codes. We see how traces of Hecke operators acting on spaces of cusp forms for SL‚Ā°2(Z)\operatorname{SL}_2(\mathbb{Z}) play a role in these formulas.Comment: 19 pages. To appear in "Arithmetic, Geometry, Cryptography, and Coding Theory" (Y. Aubry, E. W. Howe, C. Ritzenthaler, eds.), Contemp. Math., 201

    Teaching Stats for Data Science

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    ‚ÄúData science‚ÄĚ is a useful catchword for methods and concepts original to the field of statistics, but typically being applied to large, multivariate, observational records. Such datasets call for techniques not often part of an introduction to statistics: modeling, consideration of covariates, sophisticated visualization, and causal reasoning. This article re-imagines introductory statistics as an introduction to data science and proposes a sequence of 10 blocks that together compose a suitable course for extracting information from contemporary data. Recent extensions to the mosaic packages for R together with tools from the ‚Äútidyverse‚ÄĚ provide a concise and readable notation for wrangling, visualization, model-building, and model interpretation: the fundamental computational tasks of data science
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