The hard scale in the exclusive rho-meson production in diffractive DIS
Ivanov, I. P.
Original · EN
We re-examine the issue of the pQCD factorization scale in the exclusive rho production in diffractive DIS from the kₜ-factorization point of view. We find that this scale differs significantly from, and possesses much flatter Q² behavior than widely used value (Q² + mρ²)/4. With these results in mind, we discuss the Q² shape of the rho meson production cross section. We introduce rescaled cross sections, which might provide further insight into the dynamics of rho production. We also comment on the recent ZEUS observation of energy-independent ratio sigma(gamma* p --> rho p) / sigmatot(gamma*p).
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