S parameter and pseudo Nambu-Goldstone boson mass from lattice QCD.

@article{Shintani2008SPA,
title={S parameter and pseudo Nambu-Goldstone boson mass from lattice QCD.},
author={Eigo Shintani and Shin-ichi Aoki and Hiroi Fukaya and Shuichi Hashimoto and Takuma Kaneko and Hideo Matsufuru and Tetsuya Onogi and Norikazu Yamada},
journal={Physical review letters},
year={2008},
volume={101 24},
pages={242001}
}

We present a lattice calculation of L10, one of the low-energy constants in chiral perturbation theory, and the charged-neutral pion squared-mass splitting, using dynamical overlap fermion. The exact chiral symmetry of the overlap fermion allows us to reliably extract these quantities from the difference of the vacuum polarization functions for vector and axial-vector currents. In the context of the technicolor models, these two quantities are read as the S parameter and the pseudo Nambu… CONTINUE READING