Search for gluino-mediated bottom- and top-squark production in pp collisions at 8 TeV

A search for supersymmetry is presented based on events with large missing transverse energy, no isolated electron or muon, and at least three jets, at least one of which must be identified as a bottom-quark jet. A simultaneous examination of the number of events in exclusive bins of $H_{\mathrm{T}}$, missing transverse energy, and bottom-quark jet multiplicity is performed, where $H_{\mathrm{T}}$ is the scalar sum of jet transverse momentum values. The sample consists of an integrated luminosity of 19.4~fb$^{-1}$ of proton-proton collision data recorded at a center-of-mass energy of 8~TeV with the CMS detector at the LHC in 2012. The observed number of events is found to be consistent with the expectation from the standard model, which is evaluated with control samples in the data. The results are interpreted in the context of simplified models of new physics processes in which gluino pair production is followed by the decay of each gluino to an undetected particle and either two bottom quarks or two top quarks.