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The precise measurement of the Cabibbo-Kobayashi-Maskawa unitarity triangle angle \(\phi _{3}\) plays a crucial role in testing the consistency of the standard model (SM) description of \(CP\!\) violation. The determination of \(\phi _{3}\) with \(B^-\rightarrow D^{(*)}K^-\) decays is theoretically robust and free from loop-level contributions, making it an ideal benchmark for comparison with beyond-the-SM-sensitive measurements. We present a measurement of \(\phi _{3}\) using a model-independent Dalitz plot analysis of the decay \(B^{\pm } \rightarrow D^{*}(D\gamma /\pi ^{0})h^{\pm }\) , with \(D \rightarrow K_{s}^{0}\pi ^{+}\pi ^{-}\) . The decays of \(D^{*}\) to \(D\gamma \) and \(D\pi ^{0}\) are reconstructed both exclusively—where the neutral pion or photon is explicitly identified—and partially, where the neutral pion or photon is not included. The combined Belle and Belle II data set will be used.

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Determining Unitarity Triangle Angle \(\phi _3\) with \(B^{\pm } \rightarrow D^{*}(D\gamma /\pi ^{0})h^{\pm }\) Decays at Belle and Belle II

  • 会议论文

  • 发表日期：

    2025年

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  • Ansu Johnson

摘要

The precise measurement of the Cabibbo-Kobayashi-Maskawa unitarity triangle angle \(\phi _{3}\) plays a crucial role in testing the consistency of the standard model (SM) description of \(CP\!\) violation. The determination of \(\phi _{3}\) with \(B^-\rightarrow D^{(*)}K^-\) decays is theoretically robust and free from loop-level contributions, making it an ideal benchmark for comparison with beyond-the-SM-sensitive measurements. We present a measurement of \(\phi _{3}\) using a model-independent Dalitz plot analysis of the decay \(B^{\pm } \rightarrow D^{*}(D\gamma /\pi ^{0})h^{\pm }\) , with \(D \rightarrow K_{s}^{0}\pi ^{+}\pi ^{-}\) . The decays of \(D^{*}\) to \(D\gamma \) and \(D\pi ^{0}\) are reconstructed both exclusively—where the neutral pion or photon is explicitly identified—and partially, where the neutral pion or photon is not included. The combined Belle and Belle II data set will be used.