Göttingen 2025 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 9: Flavour Physics I

T 9.5: Vortrag

Montag, 31. März 2025, 17:45–18:00, VG 1.104

Dalitz analysis of B⁻ → D⁺ π⁻ π⁻ and B⁰ → D⁺ π⁻ π⁰ — Florian Bernlochner, Markus Prim, Valerio Bertacchi, Agrim Aggarwal, and •Melisa Akdag — Physikalisches Institut der Rheinischen Friedrich-Wilhelms-Universität Bonn, Germany

Recent studies have provided strong evidence that the D₀^* meson is better described by an amplitude modeled using unitarized chiral perturbation theory rather than a traditional Breit-Wigner distribution. This finding underscores the importance of a more nuanced approach to modeling these states. The D⁺ π⁻π⁻ decay is dominated by a loop diagram that includes the ρ meson, resulting in significant theoretical uncertainties. To mitigate these uncertainties, we directly access the ρ meson in the analysis by incorporating the isospin conjugated modes which include the π⁰ via the decay chain B⁰ → D⁺ ρ⁻ into our considerations. To achieve these goals, it is crucial to analyze not only the B⁻ → D⁺ π⁻π⁻ final state, which the LHCb experiment can measure with high precision, but also decays involving neutral pions, emerging from B⁰ → D⁺ π⁻π⁰, where the Belle II experiment can uniquely contribute. This allows us to study the orbitally excited charmed mesons, the D₀^* and the D₂^* in the D ππ final state, and the D₁, D₁^′ and D₂^* in the D^* ππ final state. By studying both processes we can test heavy quark spin symmetry in these final states.

Keywords: dalitz analysis; amplitude model; Belle II; charmed mesons; chiral perturbation theory