On the description of exclusive processes beyond the leading twist approximation

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I. V. Anikin, D. Yu. Ivanov, B. Pire, L. Szymanowski and S. Wallon, arXiv:0909.4090 [hep-ph], to appear in Nucl. Phys. B
Original
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Note that this introduces a non-physical n − n- dependence which we will discuss below
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We use ϵ 0123 = − ϵ 0123 = 1 \epsilon^{0123}=-\epsilon_{0123}=1 and γ 5 = i γ 0 γ 1 γ 2 γ 3 . \gamma_{5}=i\,\gamma^{0}\,\gamma^{1}\,\gamma^{2}\,\gamma^{3}
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The appearance of the total derivative may be interpreted as a (vector) analog to the renormalization group (RG) invariance when the dependences on the renormalization parameter coming from various sources cancel. One can view this as a RG-like flow in the space of light-cone directions of contributions to the amplitude where the polarization vector plays the role of a beta function
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We use the generic notation φ = φ W W + φ g e n . \varphi=\varphi^{WW}+\varphi^{gen}\,
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