mesons ”
نویسنده
چکیده
In [1] the light scalar meson nonet has been considered within the QCD sum rules approach with the interpolating current consisting of the scalar diquark and the scalar antidiquark. It has been shown that the negative contributions from the operators of dimension 8 are dominant in the sum rules, so that, there is no evidence of the coupling of the above tetraquark current with the light scalar meson nonet. We should stress that within the standard operator product expansion (OPE) [2] we have considered in our paper [1] the contributions of all possible diagrams of dimension d = 8. There are only two relevant diagrams which are pictured in Fig.1. However, our result for d = 8 operator contributions is criticized in the recent comments by Bracco et al. [3, 4] where the authors claim that there must be some additional essential contribution coming from the “missed” third diagram shown in Fig.2. We should stress, that if it were correct, it would spoil not only our specific result for the tetraquark case but also all other well established results for high dimension operator contributions in the OPE (see, for example, [5]).
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تاریخ انتشار 2006