Related Experiment Video
Updated: Jun 26, 2026

Setting Limits on Supersymmetry Using Simplified Models
Published on: November 15, 2013
S parameter and pseudo Nambu-Goldstone boson mass from lattice QCD
1High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801, Japan.
Abstract:
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-Goldstone boson mass, respectively, and play an important role in discriminating the models from others. This calculation can serve as a feasibility study of the lattice techniques for more general technicolor gauge theories.
Related Concept Videos
Subatomic Particles
High-Resolution Mass Spectrometry (HRMS)
Nuclear Binding Energy
Nuclear Stability
To hold positively charged protons together in the...
The de Broglie Wavelength
Trends in Lattice Energy: Ion Size and Charge

