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Twist-3 contribution to the pion electromagnetic form factor
European Physical Journal C: Particles and Fields
Non-leading contribution to the pion electromagnetic form factor which comes from the pion twist-3 wave function is analyzed in the modied hard scattering approach (MHSA) proposed by Li and Sterman. This contribution is enhanced signicantly due to bound state eect (the twist-3 wave function is independent of the fractional momentum carried by the parton and has a large factor m 2 =m 0 with m being the pion meson mass and m 0 being the mean u-and d-quark masses). Consequently, although it isdoi:10.1007/s100529900952 fatcat:vlwrervy5vecphgtaxaionxz54