The perturbative proton form factor reexamined
نویسندگان
چکیده
منابع مشابه
The perturbative proton form factor reexamined
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 resummation are carefully chosen, such that the soft divergences from large coupling constants are diminished and perturbative QCD predictions are stablized. We find that the ...
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We recalculate the pion electromagnetic form factor based on the pertur-bative QCD formalism that includes the Sudakov resummation. We take into account the evolution of the pion wave function in b, which represents the transverse extent of the pion. An infrared enhancement is observed when 1/b approaches Λ QCD. We propose to freeze the evolution of the wave function at some scale above Λ QCD ,...
متن کاملComment on the paper : “ The perturbative proton form factor reexamined ” by Kundu
We point out some serious problems in the investigation of Kundu et al. which claims agreement with the existing data of the proton form factor, calculated without taking into account the intrinsic k⊥-dependence of the proton wave function. In 1993 Li [1] applied the modified factorization scheme of perturbative QCD to exclusive processes, developed in [2], to the proton form factor at large mo...
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The perturbative pion form factor with Sudakov suppression is reexamined. Taking into account the multi-gluon exchange in the law Q 2 regions, we suggest that the running coupling constant should be frozen at α s (t = < k 2 T >) and < k 2 T > is the average transverse momentum which can be determined by the pionic wave function. In addition, we correct the previous calculations about the Sudako...
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We report on the perturbative O(αs) correction to the light-cone QCD sum rule for the B → π transition form factor f+. The correction to the product fBf + in leading twist approximation is found to be about 30%, that is similar in magnitude to the corresponding O(αs) correction in the two-point sum rule for fB. The resulting cancellation of large QCD corrections in f+ eliminates one important u...
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ژورنال
عنوان ژورنال: The European Physical Journal C
سال: 1999
ISSN: 1434-6044
DOI: 10.1007/s100520050499