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SUMMARY:Meson mass spectrum from QCD sum rules
DTSTART;VALUE=DATE-TIME:20060217T110000Z
DTEND;VALUE=DATE-TIME:20060217T120000Z
DTSTAMP;VALUE=DATE-TIME:20261113T011743Z
UID:indico-event-1480@indico.ific.uv.es
DESCRIPTION:The spectra of masses and decay constants for non-strange meso
 n resonances in the energy range 0--2.5 GeV are analyzed. It is known from
  meson phenomenology that for given quantum numbers these spectra approxim
 ately follow linear trajectories with a universal slope. This fact can beu
 nderstood in terms of an effective string description for QCD. For light m
 eson states the trajectories deviate noticeably from the linear behavior. 
 We investigate the possible corrections to the linear trajectories by matc
 hing two-point correlators of quark currents to the Operator Product Expan
 sion (OPE). We find that the allowed modifications to the linear Regge beh
 avior must decrease rapidly with the principal quantum number. After fitti
 ng the lightest states in each channel and certain low-energy constants th
 e whole spectrum for meson masses and residues is obtained in a satisfacto
 ry agreement with phenomenology. We show also how such important features 
 of QCD as the chiral symmetry breaking and the formation of mass-gap can b
 e directly traced from the QCD sum rules. As a result the whole meson mass
  spectrum can be parametrized with a good accuracy by the weak pion decay 
 constant only.\n\nhttps://indico.ific.uv.es/event/1480/
LOCATION:Edf. Institutos de Investigación Sala Seminarios IFIC
URL:https://indico.ific.uv.es/event/1480/
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