a superconducting solenoid of 6 internal diameter, providing a magnetic field of 3.8. Within the solenoid volume are a silicon pixel and strip tracker, a lead tungstate crystal electromagnetic calorimeter, and a brass and scintillator hadron calorimeter, each composed of a barrel and two endcap sections. Forward calorimetry extends the pseudorapidity coverage provided by the barrel and endcap detectors to $|\eta| < 5$. Muons are measured in gas-ionization detectors embedded in the steel flux-return yoke outside the solenoid. A more detailed description of the CMS detector, together with a definition of the coordinate system used and the relevant kinematic variables, can be found in Ref. [@Chatrchyan:2008zzk].

The reconstruction of particles emerging from each collision event is obtained via a particle-flow event reconstruction technique. The technique uses an optimized combination of all information from the CMS sub-detectors to identify and reconstruct individual particles in the collision event [@CMS-PAS-PFT-09-001; @CMS-PAS-PFT-10-002]. The particles are classified into mutually exclusive categories: charged hadrons, neutral hadrons, photons, muons, and electrons. Jets are reconstructed from the individual particles using the anti-$\kt$ clustering algorithm with a distance parameter of 0.5 [@antikt], as implemented in the <span style="font-variant:small-caps;">fastjet</span> package [@Cacciari:fastjet2; @Cacciari:2011ma]. Energy deposits from the multiple pp interactions (pileup) 