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Type: Conference paper
Title: A resolution of the inclusive flavor-breaking τ |Vus| puzzle
Other Titles: A resolution of the inclusive flavor-breaking tau |Vus| puzzle
Author: Maltman, K.
Hudspith, R.
Lewis, R.
Wolfe, C.
Zanotti, J.
Citation: Proceedings of the 33rd International Symposium on Lattice Field Theory (LATTICE 2015), as published in Proceedings of Science, 2015 / vol.251, pp.1-7
Publisher: SISSA
Issue Date: 2015
Series/Report no.: Proceedings of Science; 251
ISSN: 1824-8039
Conference Name: 33rd International Symposium on Lattice Field Theory (LATTICE 2015) (14 Jul 2015 - 18 Jul 2015 : Kobe, Japan)
Statement of
Kim Maltman, Renwick Hudspith, Randy Lewis, Carl Wolfe, James Zanotti
Abstract: A combination of continuum and lattice methods is used to investigate systematic issues in the finite-energy-sum-rule determination of Vus based on flavor-breaking combinations of hadronic t decay data. Results for Vus obtained using assumptions for D > 4 OPE contributions employed in previous conventional implementations of this approach are shown to display significant unphysical dependences on the choice of sum rule weight, w, and upper limit, s0, of the relevant experimental spectral integrals. Continuum and lattice results suggest the necessity of a new implementation of the flavor-breaking sum rule approach, in which not only |Vus|, but also D > 4 effective condensates are fit to data. Lattice results also provide a means of quantifying the truncation error for the slowly converging D = 2 OPE series. The new implementation is shown to produce |Vus| results free of unphysical s0- and w-dependences and typically ∼ 0.0020 higher than the (unstable) results found using the conventional implementation. With preliminary new experimental results for the Kp branching fraction, the resulting |Vus| is in excellent agreement with that obtained from Kℓ3, and compatible within errors with expectations from three-family unitarity.
Rights: © Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND 4.0).
RMID: 0030056625
DOI: 10.22323/1.251.0260
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Appears in Collections:Physics publications

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