Exclusive processes in position space and the pion distribution amplitude

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dc.creatorBraun, V.
dc.creatorMüller, D.
dc.date2007-09-10
dc.date.accessioned2026-07-07T11:37:03Z
dc.date.available2026-07-07T11:37:03Z
dc.descriptionWe 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-4 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.
dc.description15 pages, 10 figures
dc.identifierhttps://arxiv.org/abs/0709.1348
dc.identifierhttp://arxiv.org/abs/0709.1348
dc.identifierEur.Phys.J.C55:349-361,2008
dc.identifierdoi:10.1140/epjc/s10052-008-0608-4
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/199075
dc.subjectHigh Energy Physics - Phenomenology
dc.subjectHigh Energy Physics - Lattice
dc.titleExclusive processes in position space and the pion distribution amplitude
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