2007/10/31 by Chuan-Hung Chen, Chuan Hung Chen, Chao-Qiang Geng +2
Physics and Astronomy · #Black Holes and Theoretical Physics #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ex #hep-ph
paper · pdf · doi:10.1103/physrevd.77.014004
published as Phys.Rev.D77:014004,2008 · 15 pages, 4 figures, final version to be published in PRD
arxiv created 2007/12/08 · openalex publication_date 2008/01/07 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
Within the frameworks of the light-front quark model (LFQM) and chiral perturbation theory (ChPT) of O(p6), we reevaluate the form factors of the K+\ensuremath→\ensuremathγ transition. We use these form factors to study the decay of K+\ensuremath→e+\ensuremathνe\ensuremathγ, which is dominated by the structure-dependent contribution. We show the differential decay branching ratio as a function of x=2E_\ensuremathγ/mK, where E_\ensuremathγ(mK) is the photon energy (kaon mass). Explicitly, we find that, in the standard model with the cut of x=0.01 (0.1), the decay branching ratio of K+\ensuremath→e+\ensuremathνe\ensuremathγ is 1.54(1.44)\ifmmode×\else\texttimes\fi10^\ensuremath-5 and 1.57(1.47)\ifmmode×\else\texttimes\fi10^\ensuremath-5 in the LFQM and ChPT, respectively.