Aug 2 – 6, 2021
Europe/Brussels timezone

The pion light-cone distribution amplitude from the pion electromagnetic form factor

Aug 3, 2021, 9:40 AM


Parallel contribution B: Light quarks Parallels Track B


Alexander Khodjamirian (University of Siegen)


We suggest to probe the pion light-cone distribution amplitude, transforming the
dispersion relation for the pion electromagnetic form factor into
an equation between the spacelike form factor
$F_\pi(Q^2)$ and the integrated modulus of the timelike form factor.
For $F_\pi(Q^2)$, the QCD light-cone sum rule in terms of the
pion light-cone distribution amplitudes is used. From this equation,
employing the measured pion timelike form factor, it is possible to fit and/or constrain the Gegenbauer moments of the pion twist-2 distribution amplitude. As an independent test of our approach, we compare the spacelike pion form factor obtained in two different
ways: from the dispersion relation and from the light-cone sum rule with the measurement by the Jefferson Lab $F_\pi$ collaboration.

Primary author

Alexander Khodjamirian (University of Siegen)

Presentation materials