[SEMINARI]: Dr. Pallante: Quenched Chiral Perturbation Theory for Weak Interactions

[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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            Quenched Chiral Perturbation Theory for Weak Interactions

                             Elisabetta Pallante

                         (Universitat de Barcelona)

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                     Aula de Seminaris de Física Teòrica
                  Thursday 04 of March of 1999 at 12:00 AM
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                                    Resum

 Chiral Perturbation Theory (ChPT) combined with lattice QCD is a promising
 tool for computing hadronic weak matrix elements at long distances. Here I
 discuss the derivation of the one loop generating functional of ChPT in the
   presence of weak interactions with $\vert\Delta S\vert =1,\, 2$ and the
  modifications induced by the {\em quenched} approximation adopted on the
  lattice. As an immediate application, the full and quenched behaviours of
  the chiral logarithms which appear in $K\to\pi\pi$ matrix elements can be
                 studied both for $\Delta I=1/2$ and $3/2$.

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