Aachen 2019 – scientific programme

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T: Fachverband Teilchenphysik

T 65: Experimentelle Methoden II

T 65.9: Talk

Wednesday, March 27, 2019, 18:00–18:15, S01

Studies for the calibration of a strange tagger in ATLAS using full Run-2 data — Johannes Erdmann, •Egor Evsenin-Gutschank, Kevin Kröninger, and Sonja Zeißner — TU Dortmund, Lehrstuhl für Experimentelle Physik IV

Up to date, the measurement of the CKM matrix element |V_ts| relies on indirect methods. A major obstacle for the development of a direct measurement method is the absence of a reliable way to distinguish between jets originating from strange quarks and jets from other light quarks. Studies to discriminate between strange and up/down jets using multivariate methods are ongoing. This talk presents studies for calibrating such a strange tagging algorithm, which is still under development. Full ATLAS Run-2 data were used for studies to measure the efficiency of the tagging algorithm.