Braun, Vladimir M. and Khodjamirian, A. and Maul, M. (2000) Pion form factor in QCD at intermediate momentum transfers. PHYSICAL REVIEW D, 61 (7): 073004. ISSN 0556-2821
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We present a quantitative analysis of the electromagnetic pion form factor in the light-cone sum rule approach, including radiative corrections and higher-twist effects. The comparison to the existing data favors the asymptotic profile of the pion distribution amplitude and allows us to estimate the deviation: [integral dulu phi(pi)(u)]/[integral dulu phi(pi)(as)(u)] = 1.1+/- 0.1 at the scale of 1 GeV. Special attention is paid to the precise definition and interplay of soft and hard contributions at intermediate momentum transfer, and to the matching of the sum rule to the perturbative QCD prediction. We observe a strong numerical cancellation between the soft (end-point) contribution and power-suppressed hard contributions of higher twist, so that the total nonperturbative correction to the usual PQCD result turns out to be of the order of 30% for Q(2) similar to 1 GeV2.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | SUM-RULES; QUANTUM CHROMODYNAMICS; EXCLUSIVE PROCESSES; PERTURBATIVE QCD; DISTRIBUTION AMPLITUDE; RADIATIVE-CORRECTIONS; EVOLUTION-EQUATIONS; ASYMPTOTIC-BEHAVIOR; TRANSVERSE-MOMENTUM; NONLEADING TWIST; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics > Chair Professor Braun > Group Vladimir Braun |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 24 May 2022 06:32 |
| Last Modified: | 24 May 2022 06:32 |
| URI: | https://pred.uni-regensburg.de/id/eprint/42704 |
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