[SEMINARI]: Dr. Neufeld: Chiral Perturbation Theory with Virtual Photons and Leptons

Arcadi Santamaria Arcadi.Santamaria en uv.es
Jue Oct 28 11:12:02 CEST 1999


 
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                              S E M I N A R I

        [Image]        Departament de Física Teòrica         [Image]
                  Universitat de València - IFIC (UV-CSIC)
                      46100 Burjassot (València) Spain

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           Chiral Perturbation Theory with Virtual Photons and Leptons

                             Dr. Helmut Neufeld

                         (ITP, Univ. Wien, Austria)

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         Sala de Juntes de l'edifici de l'IFIC a Paterna, primer pis
                 Thursday 28 of October of 1999 at 11:30 AM
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                                    Resum

     I discuss a low-energy effective field theory which allows the full
 treatment of isospin-breaking effects in semileptonic weak interactions. To
 this end, the particle spectrum of chiral perturbation theory with virtual
photons is enlarged by including also the light leptons as dynamical degrees
of freedom. The additional one-loop divergences generated by the presence of
  virtual leptons are determined by using super-heat-kernel techniques. The
 full list of associated counterterms is given. I illustrate the use of this
effective theory by applying it to the decays $\pi \rightarrow \ell \nu$ and
$K \rightarrow \ell \nu$. (See also hep-ph/9909284 for further information.)

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