Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1999-12-06
Phys.Lett. B482 (2000) 77-86
Physics
High Energy Physics
High Energy Physics - Phenomenology
10 pages, 1 figure. NLO determination of strong IB modification of weak 27-plet transitions now also included; modified phase
Scientific paper
10.1016/S0370-2693(00)00461-5
Strong isospin-breaking (IB) contributions to both the octet and 27-plet weak K-->2 pi transitions are evaluated at next-to-leading order (NLO) in the chiral expansion. NLO contributions are shown to significantly reduce the leading order result for the potentially large contribution to the $\Delta I=3/2$ amplitude resulting from strong isospin-breaking modifications to the weak Delta I=1/2 amplitude. The ratio of strong IB 27-plet to strong IB octet contributions is found to be small for all decay amplitudes. Combined with recent results on the corresponding electromagnetic contributions, we find that the ratio of the intrinsic strengths of octet and 27-plet effective weak operators can be taken to be that obtained from experimental data, analyzed ignoring isospin breaking, to an accuracy better than of order 10 percent.
Maltman Kim
Wolfe Carl E.
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