Abstract
The time-dependent CP asymmetry in B0 → Kresγ → π+π−KSγ is sensitive to the photon polarisation in the quark level process b → sγ. While this polarisation is predominantly left-handed in the standard model, it could be modified by the existence of new physics contributions that may possess different CP properties. In this paper, we derive the CP violation formulae for B0 → Kresγ → π+π−KSγ including the most dominant intermediate states. We propose a new observable that could be measured in a time-dependent amplitude analysis of B0 → π+π−KSγ decays, providing a stringent contraint on the photon polarisation. We discuss the future prospects for obtaining such constraints from measurements at Belle II and LHCb.
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Akar, S., Ben-Haim, E., Hebinger, J. et al. The time-dependent CP asymmetry in B0 → Kresγ → π+π−\( {K}_s^0\gamma \) decays. J. High Energ. Phys. 2019, 34 (2019). https://doi.org/10.1007/JHEP09(2019)034
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DOI: https://doi.org/10.1007/JHEP09(2019)034