The European Physical Journal Plus | VOL. 137
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Rescaling the isospin triangle argument for constraining phi _2 (alpha): Consolidating Belle\xa0II and a potential path forward for LHCb

Publication Date Jul 12, 2022

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\xa0II 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\xa0II input is shown to become viable even without a measurement of C!P violation in B^0 rightarrow rho ^+rho ^-.

Concepts

Relative Fractions Relative Branching Fractions Relative Branching Branching Fractions

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