Pion transition form factor in the Regge approach

Details Pion transition form factor in the Regge approach Pion transition form factor in the Regge approach

2010-08-13

arxiv.org/abs/1008.2317v2

PoS LC2010:062,2010

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 pages, talk presented by WB at Light Cone 2010, Valencia, 14-18 June 2010

Scientific paper

We explore the BaBar puzzle within the Regge approach. After reviewing the chiral quark models in applications to PDF and PDA of the pion, we argue that variants of these models, fulfilling the chiral anomaly, may in fact violate the second Terazawa-West unitarity bound, which is based on unverified assumptions for the real part of the amplitude. Consequently, the transition form factor need not vanish at large values of the photon virtuality. Then we show that the experimental data may be properly explained with incomplete vector-meson dominance in a simple model with one state, as well as in more sophisticated radial Regge models including infinitely many states. We also consider the experimental constraint from the rare Z -> pi0 gamma decay, which is comfortably satisfied in our approach. Finally, we point out that the photon momentum asymmetry parameter may noticeably influence the precision fits to the data.

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