Dortmund 2021 – scientific programme
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T: Fachverband Teilchenphysik
T 56: Flavour physics III
T 56.10: Talk
Wednesday, March 17, 2021, 18:15–18:30, Tf
Untagged Analysis of B → π ℓ νℓ using Early Belle II Data — Florian Bernlochner, Jochen Dingfelder, •Svenja Granderath, and Peter Lewis for the Belle II collaboration — Physikalisches Institut der Rheinischen Friedrich-Wilhelms-Universität Bonn
A discrepancy between the results of exclusive and inclusive measurements of the CKM matrix element |Vub| persists. The charmless semileptonic decay B → π ℓ νℓ is one of the most accessible and powerful channels for determining |Vub| in exclusive modes. Using data from the Belle II experiment, a new precision measurement of |Vub| will become possible. In preparation for this, an untagged measurement method for extracting B → π ℓ νℓ events is developed using early Belle II data. Lepton and pion candidates are combined to form B → π ℓ νℓ candidates. In order to increase the signal purity, a boosted decision tree is employed to suppress continuum and other backgrounds. This talk will discuss the current status of the analysis and present an outlook on the precision of future Belle II |Vub| measurements.