[SEMINARI]: Dr. Oller: The Psi Decays into the phi and two pions (kaon,antikaon) and the Scalar Form Factors

[Arcadi Santamaria]

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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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        The Psi Decays into the phi and two pions (kaon,antikaon) and the
                               Scalar Form Factors

                             Jose Antonio Oller

                           (FZ Juelich, IKP (Th))

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                              Seminari del IFIC
                   Thursday 11 of May of 2000 at 11:30 AM
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                                    Resum

 We have studied the the invariant mass distributions of the $\pi\pi$ and $K
       \overline{K}$ systems up to 1.2 GeV from the $\Psi \to \phi \,
 \pi\pi(K\overline{K})$ decays. The approach exploits the connection between
these processes and the $\pi\pi$ and $K\overline{K}$ strange and non-strange
scalar form factors by considering a local interaction of the form $\Psi_\mu
 \phi^\mu \left(\bar{s}s+ \lambda_\phi \, \bar{n}n\right )$. The calculated
   scalar form factors are then matched with the ones from next-to-leading
      order Chiral Perturbation Theory (CHPT). To accomplish that, the
 $K\overline{K}$ scalar form factors are also calculated at next-to-leading
   order in CHPT. Final state interactions in the $J/\Psi \rightarrow \phi
 \pi\pi(K\overline{K})$ processes are taken into account by considering the
  $\phi$ meson as a spectator and hence only two body re-scattering effects
    result. A very good agreement with the experimental data from DM2 and
   MARK-III is achieved. Furthermore, making use of $SU(3)$ symmetry, the
  S-wave contribution to the $\pi^+\pi^-$ event distribution in the $J/\Psi
    \rightarrow \omega \pi^+\pi^-$ reaction is also given reproducing the
experimental data up to 0.7 GeV (for higher energies the D-wave contribution
  is not longer negligible). The studied decays of the $J/\Psi$ to a vector
 and a pair of pseudoscalars turn out to be very sensitive to OZI violating
  physics which we parametrize in terms of $\lambda_\phi$ and the CHPT low
  energy constants $L_4^r$ and $L_6^r$. These constants all come out to be
                        clearly different from zero.

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