Abstract
We present a dispersive representation of the D-term form factor for hard exclusive reactions, using unsubtracted t
-channel dispersion relations. The t
-channel unitarity relation is saturated with the contribution of two-pion intermediate states, using the two-pion distributions amplitude for the
γ
⁎
γ
→
π
π
subprocess and reconstructing the
π
π
→
N
N
¯
subprocess from available information on pion-nucleon partial-wave helicity amplitudes. Results for the D-term form factor as function of t
as well as at t
=
0
are discussed in comparison with available model predictions and phenomenological parametrizations.
Page:
133-133
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