Erlangen 2026 – scientific programme
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T: Fachverband Teilchenphysik
T 51: Flavour Physics III
T 51.2: Talk
Wednesday, March 18, 2026, 16:30–16:45, KH 01.011
Dalitz analysis of B to D pi pi decays — •Melisa-Melek Akdag — University of Bonn, 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; amplitude; model; UChPT