Charge symmetry breaking in the neutron-proton system
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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TL;DR: In this article, the nuclear forces can be derived using effective chiral Lagrangians consistent with the symmetries of QCD, and the status of the calculations for two and three nucleon forces and their applications in few-nucleon systems are reviewed.
Abstract: Nuclear forces can be systematically derived using effective chiral Lagrangians consistent with the symmetries of QCD. I review the status of the calculations for two- and three-nucleon forces and their applications in few-nucleon systems. I also address issues like the quark mass dependence of the nuclear forces and resonance saturation for four-nucleon operators.
1,455 citations
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 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
TL;DR: In this paper, the asymmetry in the angular distribution of np->dpi{sup 0} attributable to charge symmetry breaking is calculated using heavy baryon chiral perturbation theory.
Abstract: The asymmetry in the angular distribution of np->dpi{sup 0} attributable to charge symmetry breaking is calculated using heavy baryon chiral perturbation theory. Recent developments in power counting have proven successful in describing total cross sections, and we apply them to the asymmetry calculation. Reducibility in one of the leading-order diagrams is examined. We compare the updated theory with experimental results for a range of physically reasonable parameters and find overprediction for the entire range.
21 citations
TL;DR: In this paper, the effects arising from the n-p mass difference and ω-ϱ mixing were evaluated from a momentum-space one-bosom-exchange potential.
21 citations
References
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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
38 citations
26 citations
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.
15 citations
TL;DR: In this article, a field-theoretic treatment of the pp→d π + reaction is presented, and the experimental total cross sections and angular distributions are obtained in a model which uses neither a fundamental cutoff in the π-nucleon interaction, nor a ρ exchange between nucleons.
14 citations