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SUMMARY:The Psi Decays into the phi and two pions (kaon\,antikaon) and the
  Scalar Form Factors
DTSTART;VALUE=DATE-TIME:20000511T143000Z
DTEND;VALUE=DATE-TIME:20000511T153000Z
DTSTAMP;VALUE=DATE-TIME:20261012T023718Z
UID:indico-event-1174@indico.ific.uv.es
DESCRIPTION: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 con
 nection between these processes and the $\\pi\\pi$ and $K\\overline{K}$ st
 range and non-strange scalar form factors by considering a local interacti
 on 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 t
 he $J/\\Psi \\rightarrow \\phi \\pi\\pi(K\\overline{K})$ processes are tak
 en 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 $\\pi^+\\pi^-$ e
 vent distribution in the $J/\\Psi \\rightarrow \\omega \\pi^+\\pi^-$ react
 ion is also given reproducing the experimental data up to 0.7 GeV (for hig
 her energies the D-wave contribution is not longer negligible). The studie
 d 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 ter
 ms 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.\n\nhtt
 ps://indico.ific.uv.es/event/1174/
LOCATION:Edf. Institutos de Investigación Sala Seminarios IFIC
URL:https://indico.ific.uv.es/event/1174/
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