B→Kππγ decays offer a unique way to access the photon polarisation thanks to their intricate interference patterns. With the potential to provide very competitive constraints to the C7 Wilson coefficient, this decay is of interest to both the LHCb and Belle/Belle II collaborations. In this workshop, different approaches to measure the photon polarisation in the different B→Kππγ modes will be discussed, along with the state-of-the-art theory on the complex amplitudes involved.
| The workshop will take place at IPHC in Strasbourg |  |
| and is supported by the French GDR Intensity Frontier |  |
