Bonn 2020 – scientific programme

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T: Fachverband Teilchenphysik

T 18: Flavor physics: algorithms

T 18.5: Talk

Monday, March 30, 2020, 17:30–17:45, L-3.001

Extending the Full Event Interpretation to the Y(5S) system — •Moritz Bauer and Pablo Goldenzweig for the Belle II collaboration — KIT Karlsruhe

The Belle experiment has, in addition to the data collected at the Υ(4S) resonance, also collected 121 fb⁻¹ of data at the Υ(5S) resonance. The decay products of this resonance include B_s mesons which present interesting channels to test the standard model. Until now, it has not been possible to apply Belle II’s new B meson tagging algorithm, the Full Event Interpretation (FEI), to the Υ(5S) dataset. This multivariate exclusive tagging algorithm uses O(10k) decay channels to recombine final-state particles to B mesons which increases the tagging-efficiency significantly compared to cut-based methods.

This talk presents the development and validation of the FEI at the Υ(5S) resonance.