Article ID Journal Published Year Pages File Type
1846799 Nuclear Physics B - Proceedings Supplements 2009 4 Pages PDF
Abstract

The renormalizable Abelian quantum field theory model of Kroll, Lee, and Zumino is used at the one loop level to compute vertex corrections to the tree-level, Vector Meson Dominance (VMD) electromagnetic pion form factor. These corrections, together with the one-loop vacuum polarization contribution, imply a resulting electromagnetic pion form factor in excellent agreement with data in the whole range of accessible momentum transfers in the space-like region. The time-like form factor, which reproduces the Gounaris-Sakurai formula at and near the rho-meson peak, is unaffected by the vertex correction at order O(g2). The KLZ model is also used to compute the scalar radius of the pion at the one loop level, finding . This value implies for the low energy constant of chiral perturbation theory .

Related Topics
Physical Sciences and Engineering Physics and Astronomy Nuclear and High Energy Physics