Braun, V. M. and Mueller, D. (2008) Exclusive processes in position space and the pion distribution amplitude. EUROPEAN PHYSICAL JOURNAL C, 55 (3). pp. 349-361. ISSN 1434-6044, 1434-6052
Full text not available from this repository. (Request a copy)Abstract
We suggest to carry out lattice calculations of current correlators in position space, sandwiched between the vacuum and a hadron state (e.g. pion), in order to access hadronic light-cone distribution amplitudes (DAs). In this way the renormalization problem for composite lattice operators is avoided altogether, and the connection to the DA is done using perturbation theory in the continuum. As an example, the correlation function of two electromagnetic currents is calculated to the next-to-next-to-leading order accuracy in perturbation theory and including the twist-four corrections. We argue that this strategy is fully competitive with direct lattice measurements of the moments of the DA, defined as matrix elements of local operators, and offers new insight in the space-time picture of hard exclusive reactions.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | TWIST DISTRIBUTION AMPLITUDES; TO-LEADING ORDER; PERTURBATIVE QCD; WAVE-FUNCTIONS; FORM-FACTORS; EVOLUTION; MESON; FACTORIZATION; SCATTERING; GAUGE; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics > Chair Professor Braun > Group Vladimir Braun |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 02 Nov 2020 05:39 |
| Last Modified: | 02 Nov 2020 05:39 |
| URI: | https://pred.uni-regensburg.de/id/eprint/30785 |
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