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Twist cut-off for scalar off-cone operators in q-space

Joerg Eilers Bodo Geyer
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Abstract

We show that the twist decomposition of non-local scalar off-cone QCD-operators, which in $x-$space is infinite, after Fourier transformation with the singular functions $1/(x^2 - {\text{i}} ε)^λ$ for $λ= 1$ and 2 terminates at leading and sub-leading twist, respectively. Therefore, only a finite number of twists contribute to the target mass corrections of light-cone dominated scattering processes. Their explicit expressions may be read off directly from the twist decomposition in $x-$space.

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Joerg Eilers Bodo Geyer. 2002-07-08. Twist cut-off for scalar off-cone operators in q-space. https://doi.org/10.1016/s0370-2693(02)02666-7

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