We calculate the B-parameters for operators arising in theories of new physics beyond the standard model (BSM) using HYP-smeared improved staggered fermions on the MILC asqtad lattices with N_f = 2+1 flavors. We use three different lattice spacings (a ~ 0.045, 0.06 and 0.09 fm) at a fixed ratio of light to strange quarks, m_l/m_s = 1/5, to obtain the continuum results. Operator matching is done using perturbative matching at one-loop order, and results are run to 2 or 3 GeV using two-loop running in the MS-bar scheme. For the chiral and continuum extrapolations, we use SU(2) staggered chiral perturbation theory. We present preliminary results with only statistical errors.
@article{arxiv.1211.1101,
title = {Beyond the Standard Model corrections to $K^0-\bar{K}^0$ mixing},
author = {Jon A. Bailey and Taegil Bae and Yong-Chull Jang and Hwancheol Jeong and Chulwoo Jung and Hyung-Jin Kim and Jangho Kim and Jongjeong Kim and Kwangwoo Kim and Seonghee Kim and Weonjong Lee and Jaehoon Leem and Stephen R. Sharpe and Boram Yoon},
journal= {arXiv preprint arXiv:1211.1101},
year = {2013}
}
Comments
7 pages, 4 figures, Contribution to proceedings of 30th International Symposium on Lattice Field Theory (Lattice 2012), June 24-29, 2012; Cairns, Australia