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VERSION:2.0
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SUMMARY:eta&#8722\; eta&#8242\; mixing from Chiral Lagrangian
DTSTART;VALUE=DATE-TIME:20100415T100000Z
DTEND;VALUE=DATE-TIME:20100415T110000Z
DTSTAMP;VALUE=DATE-TIME:20260718T024744Z
UID:indico-event-1748@indico.ific.uv.es
DESCRIPTION:Under large-N arguments the flavor singlet eta0 can be conside
 red as the ninth Goldstone boson. Its inclusion in a effective low-energy 
 Lagrangian\, the chiral Lagrangian\, leads to a mixing with eta8 forming t
 wo physical states\, eta and eta′. The eta − eta′ mixing scheme is s
 tudied at leading order and next to leading order in the momentum expansio
 n. It is demonstrated that the leading order is not sufficient to reproduc
 e the dynamics of the eta − eta′ system. The next to leading order ter
 ms accommodate the two physical particles but involve low-energy constants
  without a clear physical meaning. It will be shown how to reorganize the 
 low energy constants to express the mass matrix in terms of the decay cons
 tants. Under a well defined hypothesis\, the decay constants and the mixin
 g angle of the eta−eta′ system is predicted in agreement with experime
 ntal data. This procedure leads to the explanation the Feldmann\, Kroll an
 d Stech formalism without resorting to an ad hoc assumption about the deca
 y constants. The same mass matrix\, and hence the same predictions\, are r
 ecovered with a better understanding.\n\nhttps://indico.ific.uv.es/event/1
 748/
LOCATION:Edf. Institutos de Investigación Sala Seminarios IFIC
URL:https://indico.ific.uv.es/event/1748/
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