A global U-spin fit finds a severe Standard-Model tension in the longitudinal polarisation of Bs→K*0K*0 once the naive-factorisation helicity hierarchy is imposed, and simple b→s new-physics operators only partially relieve it.
Angular Correlations in the DecayB→V Vand CP Violation,
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Polarisation fractions in $B\to V_1 V_2$: U-Spin constraints and new physics signatures
A global U-spin fit finds a severe Standard-Model tension in the longitudinal polarisation of Bs→K*0K*0 once the naive-factorisation helicity hierarchy is imposed, and simple b→s new-physics operators only partially relieve it.