Detailed SU(3) flavour symmetry analysis of charmless two-body B-meson decays including factorizable corrections

A bstract We study the decays of B ( s ) mesons into light pseudoscalar mesons under the SU(3) flavour symmetry. Assuming exact SU(3) symmetry at the level of the amplitudes leads to a simple parametrisation. Using the available experimental data and accounting for mixing effects in the $$ {B}_s^0 $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mi>B</mml:mi> <mml:mi>s</mml:mi> <mml:mn>0</mml:mn> </mml:msubsup> </mml:math> branching ratios, we find that the data cannot be described with this assumption. We improve this parametrisation by including factorizable SU(3) F -breaking effects. This new approach allows for an excellent description of the data, with a fit p value of 32 . 3%. We provide posterior predictions for all observables and identify several decay channels that would significantly impact our analysis. Finally, we briefly compare our results with the predictions of QCD factorisation, paving the way to a more detailed analysis which could provide insights into QCD effects at low energy scales.