Unitarity, chiral perturbation theory, andKl4decays
- 1 January 1995
- journal article
- Published by American Physical Society (APS) in Physical Review D
- Vol. 51 (1) , 103-110
- https://doi.org/10.1103/physrevd.51.103
Abstract
Chiral perturbation theory at next-to-leading order has been successfully used to simultaneously describe the form factors in the decay K→ππeν and low-energy ππ scattering. However, since the one-loop corrections to the form factors are large, one would generally expect higher order corrections to also contribute significantly. With the use of unitarity and dispersion relations together with the chiral expansion, the effects of higher order corrections coming from ππ rescattering are investigated. These results agree well with the experimental form factors, and agree even better than the chiral prediction with the data on low-energy ππ scattering.Keywords
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