Transition Form Factors and Mixing of Pseudoscalar Mesons from Anomaly Sum Rule
Abstract
Transition form factors of pi^0, eta, eta' mesons are investigated by means of the anomaly sum rule -- an exact nonperturbative relation which follows from the dispersive representation of the axial anomaly. Considering the problem of contributions of operators originated from a non-(local) operator product expansion, we found that they are required by the available set of experimental data, including the most recent data from the Belle Collaboration (which, if taken alone, can be described without such contributions, although are compatible with them). In this approach we analyzed the experimental data on eta and eta' meson transition form factors and obtained the constraints on the decay constants and mixing parameters.
Keywords
Cite
@article{arxiv.1211.0874,
title = {Transition Form Factors and Mixing of Pseudoscalar Mesons from Anomaly Sum Rule},
author = {Yaroslav Klopot and Armen Oganesian and Oleg Teryaev},
journal= {arXiv preprint arXiv:1211.0874},
year = {2013}
}
Comments
22 pages, 8 figures; v4: typos in Eqs. (52), (53) are corrected, no result is affected