We present a simple physical description of the off-diagonal gluon distribution g(x,x^',Q²) and splitting function Pgg(x,x^') which enter the amplitude for diffractive vector meson production. We study the off-diagonal effects both on the evolution in Q² and on the input distribution. We predict the ratio R of the off-diagonal to the diagonal gluon density, x^'g(x,x^',Q²)/xg(x,Q²), as a function of the kinematic variables.
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Martin et al. (1998) studied this question.
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