1995/12/23 by L. Littenberg, L. S. Littenberg, G. Valencia · 1 citation
Computer Science · Mathematics · Physics and Astronomy · #Branching fraction #Cabibbo–Kobayashi–Maskawa matrix #Computational Physics and Python Applications #Dark Matter and Cosmic Phenomena #Geometry #Isospin #Mathematics #Observable #Particle physics #Particle physics theoretical and experimental studies #Physics #Pi #Quantum Chromodynamics and Particle Interactions #Quantum mechanics #Quark #Standard Model (mathematical formulation) #hep-ph
paper · pdf · doi:10.1016/0370-2693(96)00845-3
published as Phys.Lett. B385 (1996) 379-384 · 10 pages, LaTeX, 2 Postscript figures. Title and abstract have been revised to better reflect the content of the paper. This is the final version as published
openalex publication_date 1995/12/23 · arxiv created 1996/10/15 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We study the reactions K → π π ν ν within the minimal standard model. We use isospin symmetry to relate the matrix elements to the form factors measured in Kℓ 4. We argue that these modes are short distance dominated and can be used for precise determinations of the CKM parameters ρ and η. Depending on the value of the CKM angles we find branching ratios in the following ranges: B(KL → π+ π- ν ν) = [2-5] × 10-13; B(KL → π0 π0 ν ν) = [1-3] × 10-13; B(K+ → π+ π0 ν ν) = [1-2] × 10-14. We also discuss a possible CP-odd observable.