Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2009-07-06
Eur.Phys.J.C64:361-371,2009
Physics
High Energy Physics
High Energy Physics - Phenomenology
19 pages, 5 figures. To be published in Eur. Phys. J. C
Scientific paper
10.1140/epjc/s10052-009-1151-7
Central exclusive Higgs boson production, pp -> p+H+p, at the LHC can provide important complementary contribution to the comprehensive study of the Higgs sector in a remarkably clean topology. The bb(bar) Higgs decay mode is especially attractive, and for certain BSM scenarios may even become the discovery channel. Obvious requirements for the success of such exclusive measurements are strongly suppressed and controllable backgrounds. One potential source of background comes from additional gluon radiation which leads to a three-jet bb(bar)g final state. We perform an explicit calculation of the subprocesses gg -> q(bar)qg, gg -> ggg in the case of `internal' gluon radiation from the spectator, t-channel screening gluon, when the two incoming active t-channel gluons form a colour octet. We find that the overall contribution of this source of background is orders of magnitude lower than that caused by the main irreducible background resulting from the gg^{PP} -> b(bar)b subprocess. Therefore, this background contribution can be safely neglected.
Khoze Valery A.
Martin A. D.
Ryskin M. G.
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