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T: Fachverband Teilchenphysik

T 16: Experimental Methods (general) 1

T 16.1: Talk

Monday, March 21, 2022, 16:15–16:30, T-H29

Measurement of the CMS offline tracking efficiency from the ratio of reconstructed D^* and D⁰ mesons — •Yewon Yang and Achim Geiser — DESY, Hamburg, Germany

The efficiency for offline track reconstruction in CMS is measured directly from the data using a novel method. This method is based on taking the ratio of charm mesons reconstructed in the decay chains D^*± → K^∓π^±π_s^± and D⁰ → K^∓π^±, using the special kinematics of the so-called ’slow pion’ π_s from D^* decay. It also requires the treatment of the a priori unknown mixture of prompt (from charm) and non-prompt (from beauty) contributions to the final states. Details of the method are explained and first results for the actual tracking efficiencies are presented.