Abstract
A rescaling of the SU(2) isospin triangles constraining phi _2 (alpha) that relies on measurements of the experimentally cleaner relative branching fractions, as opposed to those absolute, is proposed. Paving the way towards more systematically sustainable analysis, this method promises to eliminate a dominant systematic at Belle II amongst others, namely the uncertainty on the number of B {bar{B}} pairs in data. Furthermore, a phi _2 constraint in the B rightarrow rho rho system at LHCb that is more independent of Belle II input is shown to become viable even without a measurement of C!P violation in B^0 rightarrow rho ^+rho ^-.
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