Abstract
In this paper we present an analysis strategy and a dedicated tool to determine the exclusion confidence level for any scenario involving multiple heavy extra quarks with generic decay channels, as predicted in several extensions of the Standard Model. We have created, validated and used a software package, called XQCAT (eXtra Quark Combined Analysis Tool), which is based on publicly available experimental data from direct searches for top partners and from Supersymmetry inspired searches. By means of this code, we recast the limits from CMS on new heavy extra quarks considering a complete set of decay channels. The resulting exclusion confidence levels are presented for some simple scenarios with multiple states and general coupling assumptions. Highlighting the importance of combining multiple topology searches to obtain accurate re-interpretations of the existing searches, we discuss the reach of the SUSY analyses so as to set bounds on new quark resonances. In particular, we report on the re-interpretation of the existing limits on benchmark scenarios with one and multiple pair-produced top partners having non-exclusive couplings to the third Standard Model generation of quarks.
Highlights
Possible theoretical model and the experimental analyses are performed either for the most popular specific scenarios or more general ones [1], like Supersymmetry (SUSY)
In this paper we present an analysis strategy and a dedicated tool to determine the exclusion confidence level for any scenario involving multiple heavy extra quarks with generic decay channels, as predicted in several extensions of the Standard Model
We have seen in recent years that the extra knowledge brought in by the recent collider data is shifting the focus of the particle theory community from established Beyond the Standard Model (BSM) scenarios of which we have no evidence to new ones which may be promptly testable by experiment
Summary
In our model-independent approach, the analysis of scenarios with multiple XQ states that can decay into any SM quark together with a Higgs or gauge boson is addressed by a dedicated computing tool called XQCAT. In addition to different rates, these three different channels have different kinematics for the final state fermions (after the W -bosons decays) and in turn different efficiencies upon the application of the analysis cuts This complication is taken into account in our code, in which we have considered each channel independently and derived the respective efficiencies as a function of the XQ mass. If one would like to study the sensitivity of an experimental search for events with same-sign di-leptons, more than 2 jets and more than 2 b-jets, the following channels can contribute to the above final state [43]: pp → BB → W +tW −t and pp → XX → W −tW +t In such a case, our tool weights the efficiencies of different channels by the different cross sections and BRs (that depend on the masses mX and mB), providing an eCL for the combined signal. The inclusion of single production to our tool strategy is straightforward, e.g., by following [33], and will be implemented in the near future
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