We review a dispersive calculation of the D-term form factor, using unsubtracted t-channel dispersion relations for the deeply virtual Compton scattering amplitudes. The t-channel unitarity relation is saturated with the contribution of two-pion intermediate states, using the two-pion generalized distributions amplitude for the ππ → NÑ subprocess and reconstructing the ππ → NÑ subprocess from available information on pion-nucleon partial-wave helicity amplitudes. The dispersion-relation results are discussed in comparison with available model predictions and phenomenological extractions.
The D-term form factor from dispersion relations in deeply virtual Compton scattering
Pasquini B.
2018-01-01
Abstract
We review a dispersive calculation of the D-term form factor, using unsubtracted t-channel dispersion relations for the deeply virtual Compton scattering amplitudes. The t-channel unitarity relation is saturated with the contribution of two-pion intermediate states, using the two-pion generalized distributions amplitude for the ππ → NÑ subprocess and reconstructing the ππ → NÑ subprocess from available information on pion-nucleon partial-wave helicity amplitudes. The dispersion-relation results are discussed in comparison with available model predictions and phenomenological extractions.File in questo prodotto:
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