Dortmund 2021 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 11: Search for Supersymmetry I

T 11.5: Vortrag

Montag, 15. März 2021, 17:00–17:15, Tk

Search for the production of a pair of stops in the all-hadronic tt+MET channel using the ATLAS detector — •Alvaro Lopez Solis — DESY-Zeuthen

Supersymmetry (SUSY) is an extension of the Standard Model associating to every fermion and boson known by now a scalar or fermion partner respectively, called superpartners. There are several phenomenological motivations of this extension, amongst which it is useful to cite three: it provides a natural solution to the Higgs mass hierarchy problem, whose diverging diagrams caused by fermionic loops are cancelled out by their corresponding superpartner-mediated loops; the provision of a cold dark matter candidate; and the gauge coupling unification at high energies.

Amongst all the versions of SUSY, I will focus on the one providing a minimal extension of the Standard Model, also called MSSM. In this theory, the top superpartner is crucial to the cancellation of the top corrections to the Higgs mass. In addition, naturalness arguments suggest that the superpartners of the third-generation quarks may present a mass of the order of TeV, meaning that they might be accessible by LHC collisions. In consequence, top partner search is a key point in the SUSY searches in ATLAS.

In this talk, I will present search for the production of a pair of top superpartners performed inside the ATLAS collaboration in the tt+MET channel. This search is focused on the all-hadronic decays of the top-quark, thus requiring no lepton in the final state.