Higher twist and higher order contributions to the pion electromagnetic form factor

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Abstract

The\(\left( {\frac{{m_\pi ^4 }}{{(m_u + m_d )^2 Q^2 }}} \right)\) andO S 2 ) corrections to the leading term of the perturbative QCD calculation of the pion electromagnetic form factor are examined numerically. Both sets of terms provide significant corrections for values ofQ 2 between 1 and 15 GeV2/c2.