PT Journal
AU Mathieu, V
   Vento, V
TI eta-eta ' mixing in the flavor basis and large N
SO Physics Letters B
JI Phys. Lett. B
PY 2010
BP 314
EP 318
VL 688
IS 4-5
DI 10.1016/j.physletb.2010.04.021
LA English
DE Meson; Mixing
AB The mass matrix for eta-eta' is derived in the flavor basis at O(p(4)) of the chiral Lagrangian using the large N approximation. Under certain assumptions, the mixing angle phi = 41.4 degrees and the decay constants ratio f(K)/f(pi) = 1.15 are calculated in agreement with the data. It appears that the FKS scheme arises as a special limit of the chiral Lagrangian. Their mass matrix is obtained without the hypothesis on the mixing pattern of the decay constants.
ER