Charge-symmetry tests in neutron-proton elastic scattering
TL;DR: In this article, the expected difference in polarizations due to one-photon exchange and ρ-ω mixing were computed and the energy and angular dependence of the polarization difference caused by these two effects are similar, but that due to ρ -ω mixing is smaller and of opposite sign.
About: This article is published in Nuclear Physics.The article was published on 1978-08-07. It has received 15 citations till now. The article focuses on the topics: Elastic scattering & Scattering.
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TL;DR: In this article, the authors reviewed the data and theory relevant to understand charge symmetry breaking in hadronic mass spittings, interactions and decay rates; nucleon-nucleon interactions; nuclear reactions; and binding energies of mirror nuclei.
334 citations
TL;DR: In this paper, the charge symmetry breaking amplitudes for the recently observed $dd\ensuremath{rightarrow}ensuredmath{\rightarrow}\ensuresuremath{\alpha}{\ensuresmath{\pi}}^{0}$ reaction are investigated.
Abstract: The charge symmetry breaking amplitudes for the recently observed $dd\ensuremath{\rightarrow}\ensuremath{\alpha}{\ensuremath{\pi}}^{0}$ reaction are investigated. Chiral perturbation theory is used to classify and identify the leading-order terms. Specific forms of the related one- and two-body tree-level diagrams are derived. As a first step toward a full calculation, a few tree-level two-body diagrams are evaluated at each considered order, using a simplified set of $d$ and $\ensuremath{\alpha}$ wave functions and a plane-wave approximation for the initial $dd$ state. The leading-order pion-exchange term is shown to be suppressed in this model because of poor overlap of the initial and final states. The higher-order one-body and short-range (heavy-meson-exchange) amplitudes provide better matching between the initial and final states and therefore contribute significantly and coherently to the cross section. The consequences this might have for a full calculation, with realistic wave functions and a more complete set of amplitudes, are discussed.
48 citations
TL;DR: In this paper, the effect of the neutron-proton mass difference in isospin-violating nuclear forces was treated by a field redefinition, which removed that mass difference from the free Lagrangian and replaced its effect by effective interactions.
Abstract: A method is developed for treating the effect of the neutron-proton mass difference in isospin-violating nuclear forces. Previous treatments utilized an awkward subtraction scheme to generate these forces. A field redefinition is used to remove that mass difference from the free Lagrangian (and hence from asymptotic nucleon states) and replace its effect by effective interactions. Previous calculations of static class II charge-independence-breaking and class III charge-symmetry-breaking potentials are verified using the new scheme, which is also used to calculate class IV nuclear forces. Two-body forces of the latter type are found to be identical to previously obtained results. A three-body force is also found. Problems involving Galilean invariance with class IV one-pion-exchange forces are identified and resolved.
42 citations
40 citations
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.
21 citations
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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
295 citations
205 citations
TL;DR: In this article, the effect of ϱω and πη mixing on the 1 S 0 NN potential was investigated and it was found that the ϱα contribution dominates and leads to an n-n potential which is more attractive than the p-p potential.
63 citations
TL;DR: The sign of the singleparticle exchange nucleon force due to ρ°-ω mixing was shown on experimental and theoretical grounds to make the resulting charge asymmetric potential, Vnn − Vpp in the 1S0 state, attractive as mentioned in this paper.
47 citations