Impact Representation of Generalized Distribution Amplitudes
نویسنده
چکیده
We develop an impact representation for the generalized distribution amplitude which describes the exclusive hadronization of a quark-antiquark pair to a pair of mesons. Experiments such as γγ → ππ and γN → ππN ′ are shown to probe the transverse size of the hadronization region of the quark antiquark pair that one can interpret as the transverse overlap of the two emerging mesons. An astonishing feature of this description is that low energy ππ phase shift analysis can be used for understanding some properties of quark hadronization process. 1. A considerable amount of theoretical and experimental work is currently being devoted to the study of generalized parton distributions [1, 2], which are defined as Fourier transforms of matrix elements between different hadron states, such as:
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