2018/12/06 by Robert Fleischer, Fleischer, Robert, Ruben Jaarsma +6
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High Energy Physics - Phenomenology (hep-ph) #Neutrino Physics Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions
paper · pdf · doi:10.48550/arxiv.1812.02672
openalex publication_date 2018/12/06 · openalex created_date 2024/04/11 · openalex updated_date 2026/07/28
Over the last two decades, B → πK modes have received a lot of attention. They are particularly interesting since the main contribution to these decays comes from QCD penguin topologies. Furthermore, electroweak penguin amplitudes enter at a level comparable to the tree topologies. In the past, a discrepancy was found in the correlation between the CP asymmetries of Bd0 → π0 K\rm S. We provide the state-of-the-art picture of this situation and consider new constraints, finding that the effect has become larger. An attractive explanation is offered by a modified electroweak penguin sector. We propose a new method to determine the relevant parameters. It employs an isospin relation between the amplitudes of the B → πK decays, and makes only minimal use of the SU(3) flavour symmetry. Using current data as well as future scenarios, we demonstrate how the mixing-induced CP asymmetry of Bd0 → π0 K\rm S plays a key role in this analysis. The application of our strategy at the next generation of B-physics experiments may establish New Physics and reveal new sources of CP violation in the electroweak penguin sector.