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SUMMARY:Flavor SU(3) Symmetry of the Pseudoscalar Meson-Baryon Couplings i
 n QCD sum rules.
DTSTART;VALUE=DATE-TIME:20001031T113000Z
DTEND;VALUE=DATE-TIME:20001031T123000Z
DTSTAMP;VALUE=DATE-TIME:20261012T081501Z
UID:indico-event-1193@indico.ific.uv.es
DESCRIPTION:It is important to study the meson-baryon couplings carefully 
 as they are the key quantities that determine the meson exchange interacti
 ons between baryons. The SU(3) symmetry plays a central role there\, but i
 ts foundation is not solid from QCD viewpoints.\nWe have evaluated the dia
 gonal meson-baryon couplings\, $\\pi NN$\, $\\eta NN$\, $\\pi \\Xi\\Xi$\, 
 $\\eta \\Xi\\Xi$\, $\\pi\\Sigma \\Sigma$ and $\\eta \\Sigma \\Sigma$\, usi
 ng the QCD sum rules for the baryon-baryon correlation function with a mes
 on\, $i \\int d^4x e^{iqx} \\langle 0|{\\rm T}[J_B(x) \\bar J_B(0)] |M(p)\
 \rangle$. We compare three Dirac structures: $i\\gamma_5$\, $i\\gamma_5 \\
 gamma\\cdot p$\, and $\\gamma_5\\sigma_{\\mu\\nu}q^\\mu p^\\nu$ structures
  and have found that the last one gives the most reliable predictions. We 
 consider general combinations of two independent baryon interpolating fiel
 ds and study how the results depend on the interpolating fields.\nIn the S
 U(3) limit\, we identify the OPE terms responsible for the $F/D$ ratio\, a
 nd find the ratio $F/D \\sim 0.68$\, which is surprisingly close to the va
 lue predicted by the SU(6) symmetry. SU(3) breaking effects are partially 
 taken into account to see their significance.\n\nhttps://indico.ific.uv.es
 /event/1193/
LOCATION:Edf. Institutos de Investigación Sala Seminarios IFIC
URL:https://indico.ific.uv.es/event/1193/
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