Beyond the Standard Model B-parameters with improved staggered fermions in $N_f=2+1$ QCD
| Autor: | Bae, Taegil, Jang, Yong-Chull, Jeong, Hwancheol, Kim, Jangho, Kim, Jongjeong, Kim, Kwangwoo, Kim, Seonghee, Lee, Weonjong, Leem, Jaehoon, Kim, Hyung-Jin, Jung, Chulwoo, Sharpe, Stephen R., Yoon, Boram |
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| Rok vydání: | 2013 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| Popis: | We calculate the kaon mixing B-parameters for operators arising generically in theories of physics beyond the standard model. We use HYP-smeared improved staggered fermions on the $N_f = 2+1$ MILC asqtad lattices. Operator matching is done perturbatively at one-loop order. Chiral extrapolations are done using "golden combinations" in which one-loop chiral logarithms are absent. For the combined sea-quark mass and continuum extrapolation, we use three lattice spacings: $a \approx 0.045, 0.06$ and $0.09 \text{fm}$. Our results have a total error of 5-6%, which is dominated by the systematic error from matching and continuum extrapolation. For two of the BSM $B$-parameters, we agree with results obtained using domain-wall and twisted-mass dynamical fermions, but we disagree by $(4-5)\sigma$ for the other two. Comment: 7 pages, 5 figures, Lattice 2013 Proceeding |
| Databáze: | arXiv |
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