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Journal ArticleDOI

Charge symmetry breaking in the neutron-proton system

20 Oct 1980-Nuclear Physics (North-Holland)-Vol. 348, Iss: 4, pp 365-387
TL;DR: In this paper, the expected differences in polarizations due to one-boson exchanges, particularly a photon exchange, isospin mixed mesons, and a pion (with the n-p mass difference taken into account), are computed.
About: This article is published in Nuclear Physics.The article was published on 1980-10-20 and is currently open access. It has received 21 citations till now. The article focuses on the topics: Asymmetry & Elastic scattering.

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Citations
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Journal ArticleDOI
C.Y. Cheung1, Sheng Li1
TL;DR: In this article, a general scheme of solving a relativistic two-body equation with phenomenological potentials is presented, which can be reduced to solving a pair of coupled Schrodinger-type equations.

5 citations

Journal ArticleDOI
TL;DR: In this paper, the effect of isospin-violating meson-nucleon coupling constants on low-energy pion-Nucleon scattering was examined in the context of a nonrelativistic quark model.

4 citations

Journal ArticleDOI
J.A. Niskanen1, M.J. Iqbal1
TL;DR: In this article, the isospin breaking effect of ϱω mixing in the reaction np→d π 0 using the coupled channels method to incorporate intermediate NΔ states was calculated.

3 citations

Book ChapterDOI
01 Jan 1987
TL;DR: The sensitivity of different tests of nuclear charge symmetry (CS) is best reviewed by grouping various systems and reactions by their dependence on δ m (see Table) as mentioned in this paper, and a different classification of charge dependent forces according to their isospin dependence has been given earlier based on their degrees of freedom.
Abstract: Nuclear charge symmetry (CS) is a classic case of an intrinsically broken symmetry. At the quark level the CS operation is the interchange of the d and u quarks. Since the mass of the u quark is about 3–4 MeV less than that of the d quark and since the d quark has an electric charge of -1/3 e, while the u quark has +2/3 e, CS violation always occurs for two reasons simultaneously: the d-u quark mass difference (δm) and the difference in electromagnetic (em) interactions. The sensitivity of different tests of CS is best reviewed by grouping various systems and reactions by their dependence on δ m (see Table). A different classification of charge dependent forces according to their isospin dependence has been given earlier based on nucleon and meson degrees of freedom resulting in a complex description of CS violating mechanisms, some of them e.g. form-factor and meson-lifetime effects, have been neglected. It is anticipated that the detailed calculation of the magnitude and sign of effects of CS violation based on the indirect mechanism of isovector-isoscalar-meson mixing, dominated by ρ-ω and π-η mixing, as well as the n-p mass difference and e.m. interactions, will eventually agree with those calculated from the interchange of u and d quarks.

2 citations

References
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Journal ArticleDOI
TL;DR: In this article, an energy independent nucleon-nucleon potential model was proposed to represent the n-p data in a satisfactory manner for the first time, and the phase shifts predicted by the model were in fair agreement with the solutions YLAM ( T = 1) and YLAN3M (T = 0) recently found by the Yale group.

821 citations

Book
01 Jan 1966

691 citations

Journal ArticleDOI
TL;DR: In this paper, electron-nucleon form factors were determined from Rosenbluth plots and, independently, by fitting a dispersion ansatz to electron nucleon scattering cross sections, allowing for a renormalization of the data in both cases.

462 citations