Speaker
Description
The $\mbox{Belle}~\mbox{II}$ experiment began collecting data in 2019 and has since accumulated approximately 500 million $B\bar{B}$ meson pair events produced in $e^+e^-$ collisions. The decays of these $B$ mesons into charmless final states, i.e. those containing no charm quarks, are dominated by loop transitions. Potential new physics particles may be able to enter these loops, making such decays sensitive to new physics beyond the Standard Model.
An analysis of $B$ meson decays into charmless three-body final states will be presented. These multibody decays exhibit a rich intermediate resonance structure that can be resolved performing an amplitude (Dalitz plot) analysis.
Internal symmetries, such as isospin, can then be exploited to combine multiple decay modes into so-called sum rules, which provide a precise null test of the Standard Model. Any experimental violation would suggest the presence of new physics in these decays.
