Inclusive search for supersymmetry using the razor variables in pp collisions at sqrt(s) = 7 TeV

TL;DR

This paper reports a search for new heavy particles, including supersymmetry, using razor variables in proton-proton collisions at 7 TeV, setting exclusion limits on gluino, squark, stop, and sbottom masses.

Contribution

It introduces an inclusive razor variable analysis method for supersymmetry searches with minimal model assumptions.

Findings

No excess events beyond the Standard Model prediction.

Excluded gluino masses up to 800 GeV and squark masses up to 1.35 TeV.

Excluded stop or sbottom pair production for masses up to 400 GeV.

Abstract

An inclusive search is presented for new heavy particle pairs produced in sqrt(s) = 7 TeV proton-proton collisions at the LHC using 4.7 +/- 0.1 inverse femtobarns of integrated luminosity. The selected events are analyzed in the 2D razor space of MR, an event-by-event indicator of the heavy particle mass scale, and R, a dimensionless variable related to the missing transverse energy. The third-generation sector is probed using the event heavy-flavor content. The search is sensitive to generic supersymmetry models with minimal assumptions about the superpartner decay chains. No excess is observed in the number of events beyond that predicted by the standard model. Exclusion limits are derived in the CMSSM framework as well as for simplified models. Within the CMSSM parameter space considered, gluino masses up to 800 GeV and squark masses up to 1.35 TeV are excluded at 95% confidence level depending on the model parameters. The direct production of pairs of stop or sbottom quarks is excluded for masses as high as 400 GeV.