DOI 10.1007/s100529900004
The perturbative proton form factor reexamined
Bijoy Kundu1 - Hsiang-nan Li2 - Jim Samuelsson1 - Pankaj Jain1,3
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
Abstract
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.
Copyright Springer-Verlag