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The left-handed chiral structure of the W bosons in the Standard Model implies that Charge-Parity (CP) violation parameters measured in radiative penguin decays of \(\mathrm B\) mesons should be close to zero due to the suppression of right-handed polarised photons in the final state. Therefore these decays are sensitive to new physics through heavy new particles in the loop that can enhance the right-handed contribution. Measurements of time dependent CP violation (TDCPV) parameters in these decays can thus be an excellent probe for new physics. The \(\textrm{B} \rightarrow \textrm{K}^*\) ( \(K_{S}^{0}\) \(\pi ^0\) ) \(\gamma \) modes have the largest branching fraction of these decays and hence offer the best sensitivities to these parameters. We present a Monte Carlo study for sensitivity projections of Belle and Belle II experiments for TDCPV measurements in \(\textrm{B} \rightarrow \textrm{K}_{\textrm{S}} \pi ^0 \gamma \) decays.

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Time-Dependent CP Violation Measurements in Radiative Penguin Decays of B Mesons at Belle and Belle II

  • 会议论文

  • 发表日期：

    2025年

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  • Rishabh Mehta,
  • Rahul Tiwary,
  • Gagan Mohanty

摘要

The left-handed chiral structure of the W bosons in the Standard Model implies that Charge-Parity (CP) violation parameters measured in radiative penguin decays of \(\mathrm B\) mesons should be close to zero due to the suppression of right-handed polarised photons in the final state. Therefore these decays are sensitive to new physics through heavy new particles in the loop that can enhance the right-handed contribution. Measurements of time dependent CP violation (TDCPV) parameters in these decays can thus be an excellent probe for new physics. The \(\textrm{B} \rightarrow \textrm{K}^*\) ( \(K_{S}^{0}\) \(\pi ^0\) ) \(\gamma \) modes have the largest branching fraction of these decays and hence offer the best sensitivities to these parameters. We present a Monte Carlo study for sensitivity projections of Belle and Belle II experiments for TDCPV measurements in \(\textrm{B} \rightarrow \textrm{K}_{\textrm{S}} \pi ^0 \gamma \) decays.