Abstract
Top polarization is an important probe of new physics that couples to the top sector, and which may be discovered at the 14 TeV LHC. Taking the example of the MSSM, we develop a detector level analysis methodology for extracting polarization information from hadronic tops using boosted jet substructure. We show that with 100 fb-1 of data, left and right 600 GeV stops can be distinguished to 4,5σ, and 800 GeV stops can be distinguished to 3σ.
Highlights
1.1 MotivationTop physics is an important probe of theories of new physics at the TeV scale, as many of these theories positTeV-scale partners to the top quark in order to resolve theHiggs hierarchy problem.In the case of supersymmetry with R-parity, the composition of the stop tin terms of the weak eigenstates tR and tL can be constrained by observing the polarization of tops in the decay t → tχ01
Top polarization is an important probe of new physics that couples to the top sector, and which may be discovered at the 14 TeV LHC
Taking the example of the MSSM, we develop a detector level analysis methodology for extracting polarization information from hadronic tops using boosted jet substructure
Summary
Top physics is an important probe of theories of new physics at the TeV scale, as many of these theories posit. In the case of supersymmetry with R-parity, the composition of the stop tin terms of the weak eigenstates tR and tL can be constrained by observing the polarization of tops in the decay t → tχ. There are numerous theories with and without top partners containing extra massive gauge bosons Z with decays such as Z → tt. Top polarization measurements can constrain the chiral structure of their couplings to the top quark. We choose to focus on supersymmetry because it may be the most wellmotivated of this class of theories, solving the hierarchy problem up to Planck scale as well as enhancing gauge coupling unification at high scale. We employ the techniques of boosted jet substructure to access the jet clustering information, allowing us to reduce the effects of contamination while avoiding the combinatoric problem posed by having numerous monolithic jets
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