2006/03/25 by Kim Maltman, Carl E. Wolfe, C. E. Wolfe · 1 citation
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph
paper · pdf · doi:10.1016/j.physletb.2006.05.062
published as Phys.Lett.B639:283-289,2006 · 12 pages
arxiv created 2006/03/25 · openalex publication_date 2006/06/11 · arxiv updated 2009/12/01 · openalex created_date 2022/08/13 · openalex updated_date 2025/11/06
We study the reliability of extractions of |Vus| based on flavor-breaking hadronic tau decay sum rules. The ``(0,0) spectral weight'', proposed previously as a favorable candidate for this extraction, is shown to produce results having poor stability with respect to s0, the upper limit on the relevant spectral integral, suggesting theoretical errors much larger than previously anticipated. We argue that this instability is due to the poor convergence of the integrated D=2 OPE series. Alternate weight choices designed to bring this convergence under better control are shown to produce significantly improved stability, and determinations of |Vus| which are both mutually compatible, and consistent, within errors, with values obtained by other methods.