maintaining efficient triggers. To prevent ambiguities when an event satisfies the selection requirements for more than one box, the boxes are arranged in a predefined hierarchy. Each event is uniquely assigned to the first box whose criteria the event satisfies. Table \[tab:boxes\] shows the box-filling order followed in the analysis.

Six additional boxes are formed with the requirement that at least one of the jets with $\pt> 40$and $\abs{\eta} < 3.0$ be tagged as a b jet, using an algorithm that orders the tracks in a jet by their impact parameter significance and discriminates using the track with the second-highest significance [@BTAG]. This algorithm has a tagging efficiency of about 60%, evaluated using $\cPqb$ jets containing muons from semileptonic decays of $\cPqb$ hadrons in data, and a misidentification rate of about 1% for jets originating from u, d, and s quarks or from gluons, and of about 10% for jets coming from c quarks [@BTAG]. The combination of these six boxes defines an inclusive event sample with an enhanced heavy-flavor content.

Signal and standard model background modeling\[sec:mc-ana\]
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The razor analysis is guided by studies of MC event samples generated with the v6.426 [@pythia] (with Z2 tune) and [v4.22]{} [@Maltoni:2002qb] 