Karlsruhe 2024 – scientific programme

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T: Fachverband Teilchenphysik

T 49: Flavour physics 2

T 49.3: Talk

Tuesday, March 5, 2024, 16:30–16:45, Geb. 30.41: HS 4

Dalitz analysis of B⁻ → D⁺ π⁻ π⁻ — •Bhavesh Narayan Sirvi, Florian Bernlochner, Jochen Dingfelder, and Markus Prim — Physikalisches Institut der Rheinischen Friedrich-Wilhelms-Universität Bonn

Fully hadronic B meson decays provide a unique tool to study hadronic properties of excited D meson states beyond the 1S ground state. These charm states are not very well explored. In this talk we present the current status of studies of the decay of B⁻ → D⁺ π⁻ π⁻ to study orbitally excited 1P charm states, with the goal to determine widths, masses, spin and other properties. For this we carry out a Dalitz analysis, reconstructing the B⁻ → D⁺ π⁻ π⁻ via D⁺ → K⁻ π⁺ π⁺ decays. We analyze simulated Belle II data and show the sensitivity to physical parameters assuming the Run 1 integrated luminosity. More precise knowledge of these states will facilitate a better understanding of semileptonic processes, such as B⁺ → D^* τ⁺ ν_τ, for which semileptonic contributions with higher charm states represent an important background, and will help reducing uncertainties in future determinations of matrix elements of the Cabibbo-Kobayashi-Maskawa matrix.

Keywords: Dalitz analysis; B meson decay; D**; excited states; Belle II