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I describe new results on the determination of Vus from inclusive hadronic tau decay data. Such
a determination is of heightened interest in view of recent hints of possible lepton-flavoruniversality violation in semileptonic B decays. I describe an important theoretical systematic
identified in the conventional implementation of the flavor-breaking sum rule determination,
and a new implementation of this approach which cures these problems, produces larger Vus,
and resolves the long-standing inclusive tau Vus puzzle. I also describe a new dispersive
approach employing only strange tau decay data, with lattice data on the theory side, which is
shown to have significantly reduced errors. Targets for experimental improvements in lowmultiplicity strange distributions, of potential interest to the Belle II program, having the
potential to make this method competitive with conventional K decay determinations, will also
be discussed.
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semanticscholar(2021)
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Physical Review Dno. 7 (2019): 074009
Diogo Boito,Maarten Golterman, Alex Keshavarzi,Kim Maltman, Daiskuke Nomura,Santiago Peris,Thomas Teubner
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