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arXiv · 1403.6729

A Combined NNLO Lattice-Continuum Determination of $L_{10}^r$

P. A. Boyle·L. Del Debbio·N. Garron·R. J. Hudspith·E. Kerrane·K. Maltman·J. M. Zanotti
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Abstract

The renormalized next-to-leading-order (NLO) chiral low-energy constant, $L_{10}^r$, is determined in a complete next-to-next-to-leading-order (NNLO) analysis, using a combination of lattice and continuum data for the flavor $ud$ $V-A$ correlator and results from a recent chiral sum-rule analysis of the flavor-breaking combination of $ud$ and $us$ $V-A$ correlator differences. The analysis also fixes two combinations of NNLO low-energy constants, the determination of which is crucial to the precision achieved for $L_{10}^r$. Using the results of the flavor-breaking chiral $V-A$ sum rule obtained with current versions of the strange hadronic $τ$ branching fractions as input, we find $L_{10}^r(m_ρ)\, =\, -0.00346(32)$. This result represents the first NNLO determination of $L_{10}^r$ having all inputs under full theoretical and/or experimental control, and the best current precision for this quantity.

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P. A. Boyle, L. Del Debbio, N. Garron, R. J. Hudspith, E. Kerrane, K. Maltman, J. M. Zanotti. 2014-04-23. A Combined NNLO Lattice-Continuum Determination of $L_{10}^r$. https://doi.org/10.1103/physrevd.89.094510

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