[SEMINARI]: Dr. Bijnens: The Delta I=1/2 Rule in the Chiral Limit

[Arcadi Santamaria]

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                              S E M I N A R I

            [Image]    Departament de Física Teòrica     [Image]
                          Universitat de València
                      46100 Burjassot (València) Spain

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                     The Delta I=1/2 Rule in the Chiral Limit

                                Johan Bijnens

                            (Univ. Lund, Sweden)

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                     Aula de Seminaris de Física Teòrica
                 Friday 11 of December of 1998 at 12:00 AM
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                                    Resum

     We discuss the matching between long-distance and short-distance at
   next-to-leading in $1/N_c$ 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 $O(p^2)$ terms contributing to 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 $Q_6$ operator in the chiral limit. We update our
                earlier results on $B_K$ parameter as well.

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