two jets with $\pt>$ 56; electron triggers, similar to the hadronic triggers, but with looser requirements for ${\ensuremath{M_R}\xspace}$ and ${\ensuremath{R}\xspace}$ and requiring at least one electron with $\pt>$10satisfying loose isolation criteria; and muon triggers, with similar ${\ensuremath{M_R}\xspace}$ and ${\ensuremath{R}\xspace}$ requirements and at least one muon with $\abs{\eta}<2.1$ and $\pt>$ 10. All these triggers have an efficiency of $(98 \pm 2)\%$ in the kinematic regions used for the offline selection.

In addition, control samples are defined using several non-razor triggers. These include prescaled inclusive hadronic triggers, hadronic multijet triggers, hadronic triggers based on $\HT$, and inclusive electron and muon triggers.

Physics object reconstruction\[sec:RECO2011\]
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Events are required to have at least one reconstructed interaction vertex [@TRK-10-005]. When multiple vertices are found, the one with the highest scalar sum of charged track $\pt^2$ is taken to be the event interaction vertex. Jets are reconstructed offline from calorimeter energy deposits using the infrared-safe anti- [@antikt] algorithm with a distance parameter ${\ensuremath{R}\xspace}=0.5$. Jets are corrected for the non-uniformity of the calorimeter response in energy and $\eta$ using corrections derived from data and simulations and are required to have $\pt> 40$and $\abs{\eta} < 3.0$ [@JES]. To match the trigger requirements, the $\pt$ of the two 