Journal
PHYSICAL REVIEW D
Volume 95, Issue 7, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.95.076005
Keywords
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Funding
- DFG Research Unit FOR Quark Flavor Physics and Effective Theories [KH 205/2-2]
- Ministry of Science and Technology of R.O.C. [MOST-104-2112-M-001-037-MY3]
- National Natural Science Foundation of China [11235005]
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We revisit the proof of the perturbative QCD factorization for the exclusive processes p gamma(*) -> pi(p) at the two-parton twist-3 level. It is pointed out that the residual collinear divergences observed in the literature, which break the factorization of the above processes at the considered accuracy, are attributed to the improper insertion of the Fierz identity for factorizing the fermion flow. We show that the factorization theorem indeed holds at the two-parton twist-3 level after the mishandling is corrected.
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