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

Author:
B. Pasquini  M.V. Polyakov  M. Vanderhaeghen  


Journal:
Physics Letters B


Issue Date:
2014


Abstract(summary):

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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