Search for a Light Pseudoscalar Particle in the DecayKL0→π0π0X

2008/10/31 by Y. C. Tung, Y. Hsiung, Y. B. Hsiung +73 · 24 citations
Physics and Astronomy · #Computer science #Cosmology and Gravitation Theories #Particle physics #Particle physics theoretical and experimental studies #Physics #Pseudoscalar #Quantum Chromodynamics and Particle Interactions #Quark #hep-ex

paper · pdf · doi:10.1103/physrevlett.102.051802

published in Physical Review Letters 102(5), 051802 (American Physical Society) · 5 pages, 5 figures

openalex publication_date 2009/02/05 · arxiv created 2009/02/06 · arxiv updated 2010/04/23 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

We performed a search for a light pseudoscalar particle X in the decay K_L⁰\ensuremath→\ensuremathπ⁰\ensuremathπ⁰X, X\ensuremath→\ensuremathγ\ensuremathγ with the E391a detector at KEK. Such a particle with a mass of 214.3 MeV/c² was suggested by the HyperCP experiment. We found no evidence for X and set an upper limit on the product branching ratio for K_L⁰\ensuremath→\ensuremathπ⁰\ensuremathπ⁰X, X\ensuremath→\ensuremathγ\ensuremathγ of 2.4\ifmmode×\else\texttimes\fi10^\ensuremath-7 at the 90% confidence level. Upper limits on the branching ratios in the mass region of X from 194.3 to 219.3 MeV/c² are also presented.

Citations

• Evidence for the Decay Sigma+ -> p mu+ mu-
• Review of Particle Physics

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