a(0)(980)- f(0)(980) mixing in chi(c1) decay

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BAYAR M. , Debastiani V. R.

15th International Workshop on Meson Physics (MESON), Krakow, Polonya, 7 - 12 Haziran 2018, cilt.199 identifier identifier


We investigate the isospin breaking in the chi(c1) -> pi(0)pi(+)pi(- )and chi(c1) -> pi(0)pi(+)eta decays and its relation to the a(0) (980) - f(0) (980) mixing, which was measured by the BESIII Collaboration. The isospin violation is introduced through the use of different masses for the charged and neutral kaons, either in the propagators of pairs of mesons created in the chi(c1) decay, or in the propagators inside the T matrix. We find that the most important effect in the total amplitude is the isospin breaking inside the T matrix which is essential to get a good agreement with the experimental measurement of the mixing.