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Production of digluon and quark-antiquark dijets in central exclusive processes

We discuss exclusive central production of Higgs boson, quark-antiquark and digluon dijets. Some differential distributions are shown and disussed. Irreducible leading-order $b \bar b $ background to Higgs production is calculated. The signal-to-background ratio is shown and improvements are suggested by imposing cuts on $b$ ($\bar b$) transverse momenta and rapidities. We disuss also gluonic dijet production. Here we use rather reggeon-reggeon-gluon vertices. We discuss briefly also a new mechanism of emission of gluons from different $t$-channel gluons (reggeons). The latter contribution turned out to be rather small. When gluons are missidentified as $b$ or $\bar b$ jets the latter contribution constitutes a reducible but large contribution to exclusive Standard Model Higgs boson.