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The Mathematical Structure of $U$-Spin Amplitude Sum Rules

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arxiv 2205.12975 v1 pith:SP4QOYMS submitted 2022-05-25 hep-ph hep-ex

classification hep-phhep-ex
keywords rulesamplitudespinallowsderivingmathematicalnovelstructure
verification ladder T0 review T1 audit T2 compute T3 formal
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abstract

We perform a systematic study of $SU(2)$ flavor amplitude sum rules with particular emphasis on $U$-spin. This study reveals a rich mathematical structure underlying the sum rules that allows us to formulate an algorithm for deriving all $U$-spin amplitude sum rules to any order of the symmetry breaking. This novel approach to deriving the sum rules does not require one to explicitly compute the Clebsch-Gordan tables, and allows for simple diagrammatic interpretation. Several examples that demonstrate the application of our novel method to systems that can be probed experimentally are provided.

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Cited by 1 Pith paper

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  1. $D\to P \ell^+\ell^-$ decays assisted by QCD light-cone sum rules

    hep-ph 2025-05 conditional novelty 7.0 of 10

    A new LCSR-assisted dispersion method predicts the D+ to pi+ l+ l- branching fraction and shows that the short-distance c to u l+ l- transition is practically invisible in the Standard Model.

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