1999/04/20 by S. Bosch, Stefan W. Bosch, Andrzej J. Buras +10 · 6 citations
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph
paper · pdf · doi:10.1016/s0550-3213(99)00694-x
published as Nucl.Phys.B565:3-37,2000 · main latex-file, 4 figures and related latex files, 47 pages
arxiv created 1999/04/20 · openalex publication_date 2000/01/01 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We analyze the CP violating ratio \epe=epsilon'/epsilon in the Standard Model in view of the new KTeV results. We review the present status of the most important non-perturbative parameters B6, B8, BK and of the strange quark mass ms. We also briefly discuss the issues of final state interactions and renormalization scheme dependence. Updating the values of the CKM parameters, of mt and Lambda (MSbar) and using Gaussian errors for the experimental input and flat distributions for the theoretical parameters we find \epe substantially below the NA31 and KTeV data: \epe= (7.7+6.0-3.5) 10-4 and \epe= (5.2+4.6-2.7) 10-4 in the NDR and HV renormalization schemes respectively. A simple scanning of all input parameters gives on the other hand 1.05 10-4 < \epe < 28.8 10-4 and 0.26 10-4 < \epe < 22.0 10-4 respectively. Analyzing the dependence on various parameters we find that only for extreme values of B6, B8 and ms and suitable values of CKM parameters and Lambda(MSbar), the ratio \epe can be made consistent with data. We analyze the impact of these data on the lower bounds for Im(VtdVts^*), Br(KL to pi0 nu barnu), Br(KL to pi0e+e-)dir and on tan(beta) in the Two Higgs Doublet Model II.