Abstract
A search for supersymmetry in hadronic final states with highly boosted W bosons and b jets is presented, focusing on compressed scenarios. The search is performed using proton-proton collision data at a center-of-mass energy of 8 TeV, collected by the CMS experiment at the LHC, corresponding to an integrated luminosity of 19.7 inverse femtobarns. Events containing candidates for hadronic decays of boosted W bosons are identified using jet substructure techniques, and are analyzed using the razor variables M[R] and R^2, which characterize a possible signal as a peak on a smoothly falling background. The observed event yields in the signal regions are found to be consistent with the expected contributions from standard model processes, which are predicted using control samples in the data. The results are interpreted in terms of gluino-pair production followed by their exclusive decay into top squarks and top quarks. The analysis excludes gluino masses up to 1.1 TeV for light top squarks decaying solely to a charm quark and a neutralino, and up to 700 GeV for heavier top squarks decaying solely to a top quark and a neutralino.
Highlights
The CERN LHC has provided sufficient data to probe a large variety of theories beyond the standard model (SM)
Theories based on supersymmetry (SUSY) [1,2,3,4,5,6,7,8,9], which predict the existence of a spectrum of supersymmetric partners to the SM particles, are strongly motivated
The razor variables MR and R2 [39] are useful for describing a signal arising from the pair production of heavy particles, each of which decays to a massless visible particle and a massive invisible particle
Summary
The CERN LHC has provided sufficient data to probe a large variety of theories beyond the standard model (SM). We search for the challenging top squark final states described above in gluino decays. The analysis described in this paper is especially sensitive to the decay ~t1 → cχ~01. This analysis provides new information about the viability of natural SUSY. In light of the discussion above, it is expected that boosted top quarks are a promising signature of new physics involving a massive gluino decaying to a relatively light top squark. The targeted final state contains boosted W bosons and jets originating from b quarks (b jets) from top quark decays, light quark jets from unmerged hadronic W boson decay products or charm quarks, and missing energy from the neutralinos.
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