Altas Energías
gamma^* \gamma \rightarrow \pi^0 transition form factor - QCD confronts Experiment
by Dr. Adnan Bashir (UMSNH)
Wednesday, 6 March 2013
from
to
(Mexico/General)
at IF-UNAM ( Sala Sandoval Vallarta )
at IF-UNAM ( Sala Sandoval Vallarta )
| Description |
Experiments of Babar in 2009 measured \gamma^* \gamma \rightarrow \pi^0 transition form factor and reported an ultraviolet enhamcement in disaccord with long standing asymptotic QCD predictions triggering a multitude new theoretical auggestions. Employ Schwinger-Dyson equations, we present a self-consistent treatments of the pion, which connects its static properties and elastic and transition form factors. The asymptotic DSE results employing an interaction that preserves the one-loop renormalization group behavior of QCD, agree with the perturbative QCD predictions computed in the pioneering work of Brodsky and Lepage two decades ago. These results are also in agreement with all the existing experimental data with an exception of the large-Q2 BaBar data with which they disagree markedly. Our analysis supports a view that the large-Q^2 data obtained by the BaBar-Collaboration is not an accurate measure of the \gamma^* \gamma \rightarrow \pi^0 form factor. Then how does the conflict get resolved? |
| Support | Email: toledo@fisica.unam.mx |
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