Abstract
We propose a new variable, the charm fraction, for collider searches for new physics. We analyze this variable in the context of searches for simplified supersymmetry models with squarks, the gluino, and the bino, assuming that only the lightest massdegenerate squarks can be produced at the high-luminosity LHC. The charm fraction complements event counting and kinematic information, increasing the sensitivity of the searches for models with heavy gluinos, for which squark production is flavor-blind. If squarks are discovered at the LHC, this variable can help discriminate between different underlying models. In particular, with improved charm tagging, the charm fraction can provide information on the gluino mass, and in some scenarios, on whether this mass is within the reach of a future 100 TeV hadron collider.
Highlights
JHEP09(2017)114 pairs of charm squarks constitute 25% of the supersymmetry sample
We propose a new variable, the charm fraction, for collider searches for new physics
The simplified models we study here are characterized by four parameters: the number of squark flavors produced, the gluino mass, the squark mass, and the bino LSP mass
Summary
In order to demonstrate the use of the charm fraction, we consider simplified models, consisting of the first- and second-generation squarks, the gluino, and a bino LSP. We assume that the squark spectrum is flavor-blind: squarks of the same gauge quantum numbers are mass degenerate, while some hierarchies may exist between left-handed and right-handed squarks, and/or between up- and down-type squarks. We imagine a scenario in which the gluino is beyond the reach of the 14 TeV LHC, with mass above 4 TeV [10], and assume that only the lightest squarks can be directly produced. Note that the latter assumption requires only mild hierarchies among the squark masses. Nq = 4 models, in which only the right-handed squarks can be directly produced (with the left-handed squarks beyond LHC reach);. The parameters of the different models are summarized in table 1
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