Abstract
We revisit the puzzle of the >3σ low (c.f. three-family-unitarity expections) determination of Vus from the conventional implementation of flavor-breaking (FB) finite-energy sum rules (FESRs) employing inclusive hadronic τ decay data. Problems with this implementation are identified and an alternative implementation which cures them described. Using this new implementation and preliminary BaBar results for the exclusive τ→K−π0ντ find Vus=0.2228(23)exp(6)th, in excellent agreement with results from other sources. Limitations on the near-term possibilities for reducing experimental errors in this approach are highlighted, and a new proposal for improving this situation via dispersive analyses of strange hadronic τ data using lattice data as input described.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
