1999/03/12 by Y. -Y. Keum, Yong-Yeon Keum, Ulrich Nierste +3 · 29 citations
Computer Science · Physics and Astronomy · #Bound state #Computational Physics and Python Applications #Hadron #Lattice (music) #Particle physics theoretical and experimental studies #Physics beyond the Standard Model #Quantum Chromodynamics and Particle Interactions #Quark #Standard Model (mathematical formulation) #Upper and lower bounds #hep-ph
paper · pdf · doi:10.1016/s0370-2693(99)00523-7
published in Physics Letters B 457(1-3), 157-162 (Elsevier BV) · typo in eq. (5) corrected, 2 refs. added, some clarifications in text, keywords/PACS-no. added
arxiv created 1999/03/12 · openalex publication_date 1999/06/01 · arxiv updated 2014/11/17 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We analyze the theoretical implications of the new KTeV measurement of direct CP-violation in K->pi pi decays. The result is found consistent with the Standard Model for low values of the strange quark mass ms. If the hadronic parameters B6(1/2) and B8(3/2) satisfy 2 B6(1/2) - B8(3/2) < 2, as suggested by lattice and 1/Nc calculations, we find an upper bound of 110 MeV for ms (2 GeV). We parametrize potential new physics contributions to ε'/εand illustrate their correlation with upper bounds on ms. Finally we discuss a non-perturbative mechanism, which is not contained in the existing calculations of B6(1/2). This mechanism enhances B6(1/2) and thereby leads to a better understanding of the Delta I=1/2 rule and the high measured value of Re (ε^′/ε)