Light Cone Sum Rules for the pi0-gamma*-gamma Form Factor Revisited

Details Light Cone Sum Rules for the pi0-gamma*-gamma Form Factor Revisited Light Cone Sum Rules for the pi0-gamma*-gamma Form Factor Revisited

2010-12-21

arxiv.org/abs/1012.4671v1

Phys.Rev.D83:054020,2011

Physics

High Energy Physics

High Energy Physics - Phenomenology

20 pages, 14 figures, 5 tables

Scientific paper

10.1103/PhysRevD.83.054020

We provide a theoretical update of the calculations of the pi0-gamma*-gamma form factor in the LCSR framework, including up to six polynomials in the conformal expansion of the pion distribution amplitude and taking into account twist-six corrections related to the photon emission at large distances. The results are compared with the calculations of the B-> pi l nu decay and pion electromagnetic form factors in the same framework. Our conclusion is that the recent BaBar measurements of the pi0-gamma*-gamma form factor at large momentum transfers are consistent with QCD, although they do suggest that the pion DA may have more structure than usually assumed.

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