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T: Fachverband Teilchenphysik

T 86: Search for New Particles IV

T 86.3: Vortrag

Donnerstag, 18. März 2021, 16:30–16:45, Tk

Search for displaced decays of massive particles in multijet events with the ATLAS detector — •Emily Thompson — DESY, Hamburg, Germany

The existence of long-lived particles (LLPs) is a common feature in many theories beyond the Standard Model. For example, models with small couplings (i.e. R-parity-violating supersymmetry) and models allowing for decays via highly virtual intermediate states (i.e. Split supersymmetry) predict the presence of LLPs. With lifetimes ranging from picoseconds to nanoseconds, massive LLPs could decay to several electrically charged particles in the inner tracking volume of the ATLAS detector, allowing for the reconstruction of a displaced secondary vertex

In this talk, an inclusive search for new long-lived massive particles leaving a displaced vertex signature in the ATLAS inner detector in multijet events with 139 fb⁻¹ of data collected at √s = 13 TeV is presented. As there are no Standard Model particles which give rise to high-mass displaced vertices, the backgrounds stem from various instrumental and algorithmic effects. A data-driven technique to estimate the dominant source of background is presented.