S parameter and parity doubling below the conformal window
arXiv:1111.4993 · doi:10.22323/1.139.0087
Abstract
Recently the Lattice Strong Dynamics Collaboration reported a reduction of the electroweak S parameter for SU(3) gauge theory with Nf=6 fermions in the fundamental representation, compared to scaled-up QCD (arXiv:1009.5967). Here I provide additional details of our calculation. I discuss our use of conserved lattice currents; the relation to vector--axial parity doubling; finite-volume effects; and the sensitivity of our results to the number of fermion doublets with chiral electroweak couplings. Results presented here include additional data, and do not affect our previously-published conclusions.
Contribution to the proceedings of Lattice 2011, July 10-16, Lake Tahoe, California. 7 pages. v2: Eqn. 4.2 corrected, conclusions unchanged