The ΔI = 1/2 rule in the chiral limit

Johan Bijnens, Joaquim Prades

    Research output: Contribution to journalArticlepeer-review

    Abstract

    We discuss the matching between long-distance and short-distance at next-to-leading in 1/Nc and show how the scheme-dependence from the two-loop renormalization group running can be treated. We then use this method to study the three O(p2) terms contributing to non-leptonic kaon decays, namely the usual octet and 27-plet derivative terms as well as the weak mass term using the Extended Nambu Jona-Lasinio model as the low energy approximation. We also discuss subtleties in the momentum routing in the low energy theory and a problem in separating factorizable and non-factorizable contributions from the Q6 operator in the chiral limit. We update our earlier results on the BK parameter as well.

    Original languageEnglish
    JournalJournal of High Energy Physics
    Volume1999
    Issue numberJHEP01(1999)
    DOIs
    Publication statusPublished - 1999 Dec 1

    Subject classification (UKÄ)

    • Subatomic Physics

    Free keywords

    • 1/N Expansion
    • Chiral Lagrangians
    • Kaon Physics
    • Weak Decays

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