Abstract
The high energy frontier opened by the LHC is allowing us to explore physics scenarios where new physics might lay. The need to go beyond the Standard Model (SM) comes from various unanswered questions such as where does the matter-antimatter asymmetry comes from? What is the nature of Dark Matter? How can the hierarchy problem be solved? The recent discovery of an Higgs-like boson tends to disfavour the existence of a heavy 4th generation of quarks which would change the Higgs SM cross section and branching ratio in a way that is not experimentally observed. At the same time, vector-like quarks become a more compelling possibility due to their important role stabilizing the Higgs boson mass against r adiative corrections. The purpose of this poster is to review the latest results in the searches for pair production of vector-like quarks at the ATLAS experiment.
Highlights
The ATLAS experiment [1] at CERN, Geneva, is a general purpose experiment operating at the Large Hadron Collider (LHC)
As figure 1a shows, new exotics heavy quarks of mass mQ can be pair-produced with significant cross section at these energies
Searches for vector-like quarks are performed at ATLAS in a model independent way
Summary
The ATLAS experiment [1] at CERN, Geneva, is a general purpose experiment operating at the Large Hadron Collider (LHC). Searches for vector-like quarks are performed at ATLAS in a model independent way. For each mass point of the available signal samples, a scan over the BRs with a 0.05 step is performed and for each point the analyses are repeated setting 95% CL exclusion using the CLs technique [5, 6].
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