Heidelberg 2022 – scientific programme
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T: Fachverband Teilchenphysik
T 84: Flavour Physics
T 84.2: Talk
Thursday, March 24, 2022, 16:30–16:45, T-H15
Untagged Analysis of B → π ℓ νℓ and extraction of |Vub| at Belle II — Florian Bernlochner, Jochen Dingfelder, •Svenja Granderath, and Peter Lewis for the Belle II collaboration — Physikalisches Institut der Rheinischen Friedrich-Wilhelms-Universität Bonn
One of the puzzles of current research in flavor physics is the persisting discrepancy between the results of exclusive and inclusive measurements of the CKM matrix element |Vub|. 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| can be performed. In preparation for this, an untagged measurement method for extracting B → π ℓ νℓ events is developed using Belle II data. An untagged measurement allows for sufficiently large samples of this rare decay already with the current Belle II dataset. In order to increase the signal purity, boosted decision trees are employed to suppress continuum and BB backgrounds. This talk will discuss the current status of the analysis and |Vub| extraction.