m_u+m_d From Isovector Pseudoscalar Sum Rules
High Energy Physics - Phenomenology
2008-11-26 v1
Abstract
We revisit the isovector pseudoscalar sum rule determination of m_u+m_d, using families of finite energy sum rules known to be very accurately satisfied in the isovector vector channel. The sum rule constraints are sufficiently strong to allow a determination of both m_u+m_d and the excited resonance decay constants. The corresponding Borel transformed sum rules are also very well satisfied, providing a non-trivial consistency check on the treatment of direct instanton contributions. We obtain [m_u+m_d](2 GeV)=7.8\pm 1.1 MeV (in the MS bar scheme), only marginally compatible with the most recent sum rule determinations, but in good agreement with recent unquenched lattice extractions.
Keywords
Cite
@article{arxiv.hep-ph/0107060,
title = {m_u+m_d From Isovector Pseudoscalar Sum Rules},
author = {Kim Maltman and Joachim Kambor},
journal= {arXiv preprint arXiv:hep-ph/0107060},
year = {2008}
}
Comments
15 pages, 6 figures