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

Shuvaev, A. G.; Khoze, V. A.; Martin, A. D.; Ryskin, M. G.

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

Authors

Description

We calculate the amplitude of gg->bb(bar) production for the colour singlet, J_z=0 di-gluon state at O(α_S^2) order. We consider the cancellation, and a realistic cutoff, of the infrared divergent terms. We show that the one-loop radiative QCD contributions effectively reduce the Born level result for the central exclusive bb(bar) cross section at the LHC. This process is essentially the only irreducible QCD background to the exclusive H->bb(bar) signal.
24 pages, 5 figures