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We calculate the amplitude of gg->bb(bar) production for the colour singlet,J_z=0 di-gluon state at O(\alpha_S^2) order. We consider the cancellation, anda realistic cutoff, of the infrared divergent terms. We show that the one-loopradiative QCD contributions effectively reduce the Born level result for thecentral exclusive bb(bar) cross section at the LHC. This process is essentiallythe only irreducible QCD background to the exclusive H->bb(bar) signal.

One-loop gg->bb(bar) effects in the main irreducible background to exclusive H->bb(bar) production at the LHC