We present updated results for kaon B-parameters for operators arising in models of new physics. We use HYP-smeared staggered quarks on the Nf=2+1 MILC asqtad lattices. During the last year we have added new ensembles, which has necessitated chiral-continuum fitting with more elaborate fitting functions. We have also corrected an error in a two-loop anomalous dimension used to evolve results between different scales. Our results for the beyond-the-Standard-Model B-parameters have total errors of 5−10\%. We find that the discrepancy observed last year between our results and those of the RBC/UKQCD and ETM collaborations for some of the B-parameters has been reduced from 4−5σ to 2−3σ.
@article{arxiv.1411.1501,
title = {Calculation of BSM Kaon B-parameters using Staggered Quarks},
author = {Yong-Chull Jang and Hwancheol Jeong and Jangho Kim and Seonghee Kim and Weonjong Lee and Jaehoon Leem and Jeonghwan Pak and Sungwoo Park and Chulwoo Jung and Hyung-Jin Kim and Stephen R. Sharpe and Boram Yoon},
journal= {arXiv preprint arXiv:1411.1501},
year = {2014}
}