Abstract
An inclusive search for supersymmetric processes that produce final states with jets and missing transverse energy is performed in pp collisions at a centre-of-mass energy of 8 TeV. The data sample corresponds to an integrated luminosity of 11.7 fb−1 collected by the CMS experiment at the LHC. In this search, a dimensionless kinematic variable, α T, is used to discriminate between events with genuine and misreconstructed missing transverse energy. The search is based on an examination of the number of reconstructed jets per event, the scalar sum of transverse energies of these jets, and the number of these jets identified as originating from bottom quarks. No significant excess of events over the standard model expectation is found. Exclusion limits are set in the parameter space of simplified models, with a special emphasis on both compressed-spectrum scenarios and direct or gluino-induced production of third-generation squarks. For the case of gluino-mediated squark production, gluino masses up to 950–1125 GeV are excluded depending on the assumed model. For the direct pair-production of squarks, masses up to 450 GeV are excluded for a single light first- or second-generation squark, increasing to 600 GeV for bottom squarks.
Highlights
The standard model (SM) of particle physics has been extremely successful in describing phenomena at the highest energies attained far
The pair production of massive coloured sparticles is expected to result in a signature that is rich in jets, in particular those originating from bottom quarks if the third-generation squarks are light, and contains a significant amount of missing transverse energy, E/ T, due to the undetected lightest sparticle (LSP)
An inclusive search for supersymmetry with the Compact Muon Solenoid (CMS) experiment is reporte√d, sions collected at s based on a data sample of pp = 8 TeV, corresponding to an colliintegrated luminosity of 11.7 ± 0.5 fb−1
Summary
The standard model (SM) of particle physics has been extremely successful in describing phenomena at the highest energies attained far. The strategy of the analysis presented in this paper is based on the kinematic variable αT, which provides powerful discrimination against multijet production, a manifestation of quantum chromodynamics (QCD), while maintaining sensitivity to a wide range of SUSY models This analysis extends previous searches b√ased on a similar strategy with samples of pp collisions at s = 7 TeV [24,25,26]. The analysis considers a large dynamic range in the scalar sum of the transverse energies of reconstructed jets in order to probe signal models over a large range of mass splittings between the parent sparticle and the LSP, including models characterised by a compressed spectrum [27] This approach provides sensitivity to a wide variety of SUSY event topologies arising from the pair production and decay of massive coloured sparticles while still maintaining the character of an inclusive search
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