Origin of the B\to\pi K CP-asymmetry tension

Determine whether the tension between the Standard-Model correlation of the direct and mixing-induced CP asymmetries in B_d^0\to\pi^0K_S and the experimental data originates from a modified electroweak-penguin sector with New-Physics sources of CP violation.

Background

The B\to\pi K system permits a Standard-Model correlation between the direct and mixing-induced CP asymmetries of B_d^0\to\pi^0K_S. The paper reports an intriguing tension between this prediction and experimental data. It explicitly leaves unresolved whether the pattern is caused by a modified electroweak-penguin sector and associated New-Physics CP violation.