2002/07/31 by Fabrizio Gabbiani, F. Gabbiani, G. Valencia · 1 citation
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ex #hep-ph
paper · pdf · doi:10.1103/physrevd.66.074006
published as Phys.Rev. D66 (2002) 074006 · Version accepted for publication on Phys. Rev. D. 19 pages, LaTeX, 8 figures, uses epsf.sty
arxiv created 2002/08/12 · openalex publication_date 2002/10/11 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We analyze the recent NA48 data for the reaction KL\ensuremath→\ensuremathπ0\ensuremathγ\ensuremathγ with and without the assumption of vector meson dominance (VMD). We find that the data are well described by a three-parameter expression inspired by O(p6) chiral perturbation theory. We also find that it is impossible to fit the shape of the decay distribution and the overall rate simultaneously if one imposes the VMD constraints on the three parameters. We comment on the different fits and their implications for the CP-conserving component of the decay KL\ensuremath→\ensuremathπ0e+e^\ensuremath-.