Eur. Phys. J. C (2003) 31: 277-277
https://doi.org/10.1140/epjc/s2003-01356-4

erratum

Generalized parton distributions in impact parameter space

Abstract

The kinematical factor in the positivity bound (36) is incorrect. The bound correctly reads $$\begin{array}{lll} &&(1-\xi^2)^3\, \Big|\, {\cal I}_{\lambda'\lambda}(x,\xi,\vec{b}) \,\Big|^2 \\ && \le {\cal I}_{++}\Big(\frac{x-\xi}{1-\xi},0, \frac{\vec{b}}{1-\xi}\Big)\; {\cal I}_{++}\Big(\frac{x+\xi}{1+\xi},0, \frac{\vec{b}}{1+\xi}\Big) . \end{array}$$ Our corrected result agrees with inequality (25) in [1], taking into account the different normalization conventions here and there.