Abstract
A search motivated by supersymmetric models with light top squarks is presented using proton-proton collision data recorded with the CMS detector at a center-of-mass energy of sqrt(s) = 7 TeV during 2011, corresponding to an integrated luminosity of 4.98 inverse femtobarns. The analysis is based on final states with a single lepton, b-quark jets, and missing transverse energy. Standard model yields are predicted from data using two different approaches. The observed event numbers are found to be compatible with these predictions. Results are interpreted in the context of the constrained minimal supersymmetric standard model and of a simplified model with four top quarks in the final state.
Highlights
In this paper we describe a search for supersymmetry (SUSY) in final states with a single electron or muon, multiple jets, including some identified as originating from b quarks (b jets), and missing transverse energy
[11], sparticles are produced in pairs, and their decay chains terminate with the lightest supersymmetric particle (LSP)
The primary vertex must satisfy a set of quality requirements, including the restriction that the longitudinal and transverse distances of the primary vertex from the nominal interaction point be less than 24 cm and 2 cm, respectively
Summary
In this paper we describe a search for supersymmetry (SUSY) in final states with a single electron or muon, multiple jets, including some identified as originating from b quarks (b jets), and missing transverse energy. Since HT and YMET are only weakly correlated, the estimate can be obtained using a factorization approach based on three background-dominated control regions and can be calculated independently for different b-jet multiplicities. It naturally provides an estimate for a selection with ! The use of a background estimation technique based on data reduces the uncertainty on the prediction by more than a factor of 2 While both methods use the HT and E6 T variables, they have only a small overlap in their control and signal regions, both in the SM and in the signal scenarios, and are complementary.
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