Chiral symmetry and three-nucleon forces
- 1 January 1999
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review C
- Vol. 59 (1) , 53-58
- https://doi.org/10.1103/physrevc.59.53
Abstract
After a brief review of the role three-nucleon forces play in the few-nucleon systems, the chiral-perturbation-theory approach to these forces is discussed. Construction of the (nominal) leading- and subleading-order Born terms and pion-rescattering graphs contributing to two-pion-exchange three-nucleon forces is reviewed, and comparisons are made of the types of such forces that are used today. It is demonstrated that the short-range c term of the Tucson-Melbourne force is unnatural in terms of power counting and should be dropped. The class of two-pion-exchange three-nucleon forces then becomes rather uniform.Keywords
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