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Measurements are presented of the cross section for the production of atleast four jets, of which at least two originate from b quarks, inproton-proton collisions. Data collected with the CMS detector at the LHC at acenter-of-mass energy of 7 TeV are used, corresponding to an integratedluminosity of 3 inverse picobarns. The cross section is measured as a functionof the jet transverse momentum for pt > 20 GeV, and of the jet pseudorapidityfor abs(eta) < 2.4 (b jets), 4.7 (untagged jets). The correlations in azimuthalangle and pt between the jets are also studied. The inclusive cross section ismeasured to be sigma(pp to 2 b + 2 j + X) = 69 +/- 3 (stat) +/- 24 (syst) nb.The eta and pt distributions of the four jets and the correlations between themare well reproduced by event generators that combine perturbative QCDcalculations at next-to-leading-order accuracy with contributions from partonshowers and multiparton interactions.

Studies of inclusive four-jet production with two b-tagged jets in proton-proton collisions at 7 TeV