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→ππ subprocess and reconstructing the ππ→NN¯ 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.

Dispersive evaluation of the D-term form factor in deeply virtual Compton scattering

PASQUINI, BARBARA;
2014

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→ππ subprocess and reconstructing the ππ→NN¯ 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.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11571/974034
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