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Central exclusive Higgs boson production, pp -> p+H+p, at the LHC can provideimportant complementary contribution to the comprehensive study of the Higgssector in a remarkably clean topology. The bb(bar) Higgs decay mode isespecially attractive, and for certain BSM scenarios may even become thediscovery channel. Obvious requirements for the success of such exclusivemeasurements are strongly suppressed and controllable backgrounds. Onepotential source of background comes from additional gluon radiation whichleads to a three-jet bb(bar)g final state. We perform an explicit calculationof the subprocesses gg -> q(bar)qg, gg -> ggg in the case of `internal' gluonradiation from the spectator, t-channel screening gluon, when the two incomingactive t-channel gluons form a colour octet. We find that the overallcontribution of this source of background is orders of magnitude lower thanthat caused by the main irreducible background resulting from the gg^{PP} ->b(bar)b subprocess. Therefore, this background contribution can be safelyneglected.

Radiative QCD backgrounds to exclusive H -> bb(bar) production: radiation from the screening gluon