Probing beta

The angle β of the unitarity triangle may be measured by studying CP violation in the decay Bd→ψ+K0s. However, to test the Standard Model (SM) of CP violation, one would like to do more than merely measure β. Rather, one would like to measure it in a variety of decay modes which differ at the quark level, but which, if the SM is correct, all yield this same angle. Do these different decay modes actually yield the same angle, as predicted. From the standpoint of testing the SM of CP violation, decay modes which are identical at the quark level may be considered to be equivalent, even if they involve different hadrons. Results on β from equivalent decay modes may be combined to improve the statistics. In this note the authors explained which B decay modes probe β, and identify several such modes which might be amendable to experimental study. Among these are modes which differ at the quark level, so that their results can be compared to test the SM, and ones which are identical at the quark level, so that their results can be combined to improve statistics