The perturbative proton form factor reexamined
1 Department of Physics, IIT Kanpur, Kanpur-208 016, India
2 Department of Physics, National Cheng-Kung University Tainan, Taiwan, P.R. China
3 Mehta Research Institute of Mathematics and Mathematical Physics Jhusi, Allahabad, India
Received: 27 November 1998 / Published online: 7 April 1999
We recalculate the proton Dirac form factor based on the perturbative QCD factorization theorem, which includes Sudakov suppression. The evolution scale of the proton wave functions and the infrared cutoffs for the Sudakov re-summation are carefully chosen such that the soft divergences from large coupling constants are diminished and perturbative QCD predictions are stabilized. We find that the King-Sachrajda model for the proton wave function leads to results which are in better agreement with experimental data than those from the Chernyak-Zhitnitsky wave function.