Neutral kaon mixing from new physics: matrix elements in $N_f=2+1$ QCD
| Autor: | Bae, Taegil, Jang, Yong-Chull, Jeong, Hwancheol, Jung, Chulwoo, Kim, Hyung-Jin, Kim, Jangho, Kim, Jongjeong, Kim, Kwangwoo, Kim, Sunghee, Lee, Weonjong, Leem, Jaehoon, Sharpe, Stephen R., Yoon, Boram, Collaboration, SWME |
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| Rok vydání: | 2013 |
| Předmět: | |
| Zdroj: | Phys. Rev. D 88, 071503 (2013) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevD.88.071503 |
| Popis: | We present results for matrix elements of $\Delta S=2$ four-fermion operators arising generically in models of new physics. These are needed to constrain such models using the measured values of $\varepsilon_K$ and $\Delta M_K$. We use lattice QCD with 2+1 flavors of improved staggered fermions on lattices generated by the MILC collaboration. We extrapolate to the continuum from three lattice spacings ranging down to $a\approx 0.045\;$fm. Total errors are $\sim 5-6%$, arising primarily from our use of one-loop matching between lattice and continuum operators. For two of the matrix elements, our results disagree significantly from those obtained using different fermion discretizations. Comment: 5 pages, 3 figures, added references |
| Databáze: | arXiv |
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