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Measurements of the differential cross sections for the production of exactlyfour jets in proton-proton collisions are presented as a function of thetransverse momentum pt and pseudorapidity eta, together with the correlationsin azimuthal angle and the pt balance among the jets. The data sample wascollected in 2010 at a center-of-mass energy of 7 TeV with the CMS detector atthe LHC, with an integrated luminosity of 36 inverse picobarns. The crosssection for a final state with a pair of hard jets with pt > 50 GeV and anotherpair with pt > 20 GeV within abs(eta) < 4.7 is measured to be sigma = 330 +- 5(stat.) +- 45 (syst.) nb. It is found that fixed-order matrix elementcalculations including parton showers describe the measured differential crosssections in some regions of phase space only, and that adding contributionsfrom double parton scattering brings the Monte Carlo predictions closer to thedata.

Measurement of four-jet production in proton-proton collisions at sqrt(s) = 7 TeV