Study of double parton scattering using W + 2-jet events in proton-proton collisions at sqrt(s) = 7 TeV

Understand

Double parton scattering is investigated in proton-proton collisions at sqrt(s) = 7 TeV where the final state includes a W boson, which decays into a muon and a neutrino, and two jets.

• The data sample corresponds to an integrated luminosity of 5 inverse femtobarns, collected with the CMS detector at the LHC.
• Observables sensitive to double parton scattering are investigated after being corrected for detector effects and selection efficiencies.
• The fraction of W + 2-jet events due to double parton scattering is measured to be 0.055 +/- 0.002 (stat.) +/- 0.014 (syst.).