We study the effects of instantons on the charged pion electromagnetic form factor at intermediate momenta. In the single instanton approximation (SIA), we predict the pion form factor in the kinematic region [Formula Presented] By developing the calculation in a mixed time-momentum representation, it is possible to maximally reduce the model dependence and to calculate the form factor directly. We find the intriguing result that the SIA calculation coincides with the vector dominance monopole form, up to a surprisingly high momentum transfer [Formula Presented] This suggests that vector dominance for the pion holds beyond low energy nuclear physics.

Faccioli, P., Schwenk, A., Shuryak, E. (2003). Instanton contribution to the pion electromagnetic form factor at Q(2)> 1 GeV2. PHYSICAL REVIEW D, 67(11) [10.1103/PhysRevD.67.113009].

Instanton contribution to the pion electromagnetic form factor at Q(2)> 1 GeV2

Faccioli, P;
2003

Abstract

We study the effects of instantons on the charged pion electromagnetic form factor at intermediate momenta. In the single instanton approximation (SIA), we predict the pion form factor in the kinematic region [Formula Presented] By developing the calculation in a mixed time-momentum representation, it is possible to maximally reduce the model dependence and to calculate the form factor directly. We find the intriguing result that the SIA calculation coincides with the vector dominance monopole form, up to a surprisingly high momentum transfer [Formula Presented] This suggests that vector dominance for the pion holds beyond low energy nuclear physics.
Articolo in rivista - Articolo scientifico
Form Factors
English
2003
67
11
113009
none
Faccioli, P., Schwenk, A., Shuryak, E. (2003). Instanton contribution to the pion electromagnetic form factor at Q(2)> 1 GeV2. PHYSICAL REVIEW D, 67(11) [10.1103/PhysRevD.67.113009].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/405655
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