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Dortmund 2021 – scientific programme

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T: Fachverband Teilchenphysik

T 56: Flavour physics III

T 56.4: Talk

Wednesday, March 17, 2021, 16:45–17:00, Tf

Measurement of the photon energy spectrum in the fully-inclusive hadronic-tagged BXs γ decays at the Belle II experiment — •Henrikas Svidras — DESY, Notkestraße 85, 22607 Hamburg, Germany

Belle II is an experiment at the next-generation B factory SuperKEKB located at KEK in Tsukuba, Japan. It aims to probe heavy flavour physics at a higher precision than its predecessors, namely BaBar and Belle. The goal is to collect 50 ab−1 of data during its run: more than 50 times that of Belle. One of the particularly promising decay channels to study is the inclusive radiative BXsγ decay, where Xs denotes any possible decay products containing an s quark and γ is a high-energetic photon. This decay can provide constraints for beyond-SM theories, for example by measuring CP asymmetries, and be used to extract important parameters such as the b quark mass. The analysis presented in this talk focuses on the hadronic-tagged fully-inclusive approach, where one of the daughter B mesons of the Υ(4S) → B B decays into hadrons. The extraction of the photon energy spectrum of the BXs γ is one of the goals of the analysis. The talk presents an overview of the aspects and challenges of this measurement at Belle II.

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