Publications
Publication Information
| Title | Long-distance contribution to epsilon_K from lattice QCD |
| Authors | Ziyuan Bai, Norman Christ, Joseph Karpie, Christopher Sachradja, Amarjit Soni, Bigeng Wang |
| JLAB number | JLAB-THY-23-3937 |
| LANL number | (None) |
| Other number | DOE/OR/23177-7226 |
| Document Type(s) | (Journal Article) |
| Associated with EIC: | No |
| Supported by Jefferson Lab LDRD Funding: | No |
| Funding Source: | Nuclear Physics (NP) |
|
Journal Compiled for Physical Review D Volume 109 Page(s) 054501 | |
| Publication Abstract: | A lattice QCD approach to the calculation of the long-distance contributions to epsilon_K is presented. This parameter describes indirect CP violation in K ? ?? decay. While the short-distance contribution to epsilon_K can be accurately calculated in terms of standard model parameters and a single hadronic matrix element, B_K, there is a long-distance part which is estimated to be approximately 5% of the total and is more difficult to determine. A method for determining this small but phenomenologically important contribution to epsilon_K using lattice QCD is proposed and a complete exploratory calculation of the contribution is presented. This exploratory calculation uses an unphysical light quark mass corresponding to a 339 MeV pion mass and an unphysical charm quark mass of 968 MeV, expressed in the MS scheme at 2 GeV. This calculation demonstrates that future work should be able to determine this long-distance contribution from first principles with a controlled error of 10% or less. |
| Experiment Numbers: | |
| Group: | THEORY CENTER |
| Document: | |
| DOI: | https://doi.org/10.1103/PhysRevD.109.054501 |
| Accepted Manuscript: | PhysRevD.109.054501.pdf |
| Supporting Documents: | |
| Supporting Datasets: | |