A critical look at V_us determinations from hadronic tau decay data
Abstract
A critical review of hadronic tau decay data based determinations of |V_{us}| is given, focussing on the impact of the slow convergence of the integrated D=2 OPE series for the conventional flavor-breaking sum rule determination and the potential role of as-yet-unmeasured multiparticle contributions to the strange spectral distribution. Additional information obtainable from analyses of inclusive strange decay data alone, and from mixed electroproduction-tau sum rules with much reduced OPE uncertainties, is also discussed. Self-consistency tests are shown to favor determinations which reduce somewhat discrepancies with 3-family unitarity expectations.
Keywords
Cite
@article{arxiv.1011.6391,
title = {A critical look at V_us determinations from hadronic tau decay data},
author = {Kim Maltman},
journal= {arXiv preprint arXiv:1011.6391},
year = {2011}
}
Comments
7 pages, 4 figures. Prepared for: Proceedings of the 11th International Workshop on Tau Lepton Physics, Manchester, UK, September 13-17, 2010. Results updated for HFAG corrections to October 2010 HFAG tau strange branching fractions. Appendix added, containing numerical OPE results allowing exploration of conventional inclusive flavor-breaking kinematic sum rule determination (eprint only)