Tuesday, November 6, 2012

1211.0874 (Yaroslav Klopot et al.)

Transition Form Factors and Mixing of Pseudoscalar Mesons from Anomaly
Sum Rule
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Yaroslav Klopot, Armen Oganesian, Oleg Teryaev
Transition form factors of pi^0, eta and eta' mesons are investigated by means of anomaly sum rule - an exact nonperturbative relation which follows from the dispersive representation of axial anomaly. Considering the problem of contributions of operators originated from a non-(local) OPE we found that they are required by an available set of experimental data including the recent data of BELLE collaboration (which, if taken alone can be described without such contributions, although do not exclude them). In this approach we analyzed the experimental data on eta and eta' meson transition form factors and obtained constrains on decay constants and mixing parameters.
View original: http://arxiv.org/abs/1211.0874

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