K ---> 2 pi and K ---> 3 pi decays in next-to-leading order chiral perturbation theory
Apr 23, 1991
8 pages
Published in:
- Phys.Lett.B 261 (1991) 496-503
- Published: 1991
Report number:
- NSF-ITP-91-38,
- TUM-T31-13-91,
- ZU-TH-4-91,
- PSI-PR-91-05
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Abstract: (Elsevier)
We evaluate the next-to-leading corrections to K→2π and K→3π decays in chiral perturbation theory. Fitting the counterterm coupling constants of the next-to-leading order corrections to isospin amplitudes determined from the decay rates and slope parameters, we conclude that the lowest-order value of the octet coupling constant is reduced by about 30% while the 27-plet coupling constant remains unchaged. With the exception of one slope parameter, the amplitudes evidence no breakdown of chiral perturbation theory. As and additional result, the determination of the isospin amplitudes predicts that the branching ratio for K s → π + π - π 0 be (2.4±0.7) x 10 −7 .- K: nonleptonic decay
- nonleptonic decay: K
- K: width
- K: branching ratio
- amplitude analysis: isospin
- isospin: amplitude analysis
- perturbation theory: chiral
- correction: higher-order
- coupling constant
- numerical calculations
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