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We study the $\Delta I = 1/2$ rule for kaon decays and the $B_K$ parameterfor $K^0 - {\bar K}^0$ mixing in a dual 5-dimensional holographic QCD model. Weperform, in the chiral limit, computations of the relevant four-pointcurrent-current correlators, which depend upon self-interactions among the 5Dbulk fields. Spontaneous chiral symmetry breaking ($\chi$SB) is realizedthrough boundary conditions on the bulk fields. Numerical results are analyzedin comparison with QCD, chiral perturbation theory ($\chi$PT) and data, findingreasonable agreement with the experimental values of the $g_8$ and $g_{27}$parameters describing the $\Delta I =1/2,3/2$ decay channels.Comment: 4 pages, 1 figure, numerical factor corrected, references adde

physical review. d. particles, fields, gravitation, and cosmology/physical review. d, particles, fields, gravitation, and cosmology

<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>Δ</mml:mi><mml:mi>I</mml:mi><mml:mo>=</mml:mo><mml:mn>1</mml:mn><mml:mo>/</mml:mo><mml:mn>2</mml:mn></mml:math>rule in holographic QCD

ΔI=1/2rule in holographic QCD