2023/12/02 by Chao, En-Hung, Christ, Norman H., Feng, Xu +1
#FOS: Physical sciences #High Energy Physics - Lattice (hep-lat)
paper · doi:10.48550/arxiv.2312.01224
We propose a lattice-QCD-suitable framework for computing the two-photon long-distance contribution to the complex K\rm L→μ+μ- decay amplitude, where QED is treated perturbatively in the continuum and infinite-volume. We provide preliminary numerical results on the quark-connected diagrams on one ensemble at physical pion mass from this method, with well-controlled systematic errors. The successful application of this method will allow the determination of the dispersive part of the aforementioned contribution from first-principles and enable a meaningful comparison between the Standard-Model prediction and experiment.