2012/08/31 by BESIII Collaboration, M. Ablikim, M. N. Achasov +354 · 16 citations
Chemistry · Mathematics · Physics and Astronomy · #Analytical Chemistry (journal) #Branching fraction #Chemistry #Geometry #High-Energy Particle Collisions Research #Mathematics #Particle physics #Particle physics theoretical and experimental studies #Physics #Product (mathematics) #Quantum Chromodynamics and Particle Interactions #hep-ex
paper · pdf · doi:10.1103/physrevd.87.032003
published in Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields 87(3) (American Physical Society) · two-column 7 pages, 5 figures, 2 tables
arxiv created 2013/02/06 · openalex publication_date 2013/02/08 · arxiv updated 2015/03/20 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
The decay of J/\ensuremathψ to three photons is studied using \ensuremathψ(3686)\ensuremath→\ensuremathπ+\ensuremathπ^\ensuremath-J/\ensuremathψ in a sample of 1.0641\ifmmode×\else\texttimes\fi108 \ensuremathψ(3686) events collected with the BESIII detector. Evidence of the direct decay of \ensuremathηc to two photons, \ensuremathηc\ensuremath→\ensuremathγ\ensuremathγ, is reported, and the product branching fraction is determined to be B(J/\ensuremathψ\ensuremath→\ensuremathγ\ensuremathηc,\phantom\rule0ex0ex\ensuremathηc\ensuremath→\ensuremathγ\ensuremathγ)=(4.5\ifmmode±\else\textpm\fi1.2\ifmmode±\else\textpm\fi0.6)\ifmmode×\else\texttimes\fi10^\ensuremath-6, where the first error is statistical and the second is systematic. The branching fraction for J/\ensuremathψ\ensuremath→3\ensuremathγ is measured to be (11.3\ifmmode±\else\textpm\fi1.8\ifmmode±\else\textpm\fi2.0)\ifmmode×\else\texttimes\fi10^\ensuremath-6 with improved precision.