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T: Fachverband Teilchenphysik

T 83: Search for new particles IV

T 83.6: Talk

Thursday, April 2, 2020, 17:45–18:00, L-2.017

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

Massive, long lived particles (LLPs) are predicted to exist in several theories beyond the Standard Model. For example, models with small couplings, such as R-parity-violating supersymmetry, and models allowing for decays via highly virtual intermediate states, such as Split supersymmetry, can result in LLPs. With lifetimes ranging from picoseconds to nanoseconds, these LLPs could decay to several electrically charged particles in the inner tracking volume of the ATLAS detector, resulting in a displaced secondary vertex that can be reconstructed.

This presentation concerns a search for high-mass displaced vertices reconstructed in the ATLAS inner detector in multijet events with 136 fb⁻¹ of data collected at √s = 13 TeV. There are no Standard Model particles that give rise to high-mass displaced vertices. Therefore, the backgrounds stem from various instrumental effects and their expected yields are estimated from data. In this talk, a novel method to estimate all sources of background inclusively is discussed.