Dortmund 2021 – scientific programme

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T: Fachverband Teilchenphysik

T 32: Flavour physics VI

T 32.5: Talk

Tuesday, March 16, 2021, 17:00–17:15, Tg

Search for the rare decay B⁺ → ℓ⁺ ν_ℓγ with the Full Event Interpretation at the Belle II experiment — •Laura Frank and Pablo Goldenzweig — Karlsruher Institut für Technologie

Since challenging questions in flavour physics still remain open and indicate possible unrevealed New Physics, the experimental determination of CKM matrix elements and related parameters are of great importance. The e⁺e⁻ collider experiment Belle II at the SuperKEKB accelerator in Japan produces charged and neutral B-meson pairs whose decays offer a great variety of analyses including the rare decay B⁺ → ℓ⁺ ν_ℓ γ. Although no B-factory has yet to observe this decay, the existing measurements provide an important limit on the first inverse momentum λ_B of the light-cone distribution amplitude (LCDA) of the B-meson.

We present preliminary studies of the first search for B⁺ → ℓ⁺ ν_ℓ γ decays at Belle II, where the signal decay is combined with the exclusively reconstructed tag side provided by the Full Event Interpretation tagging algorithm.