Constraints on New Particle in Σ→pμμ: Insights from Experiment and Theoretical Models

Dec 08, 2025

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This study investigates constraints on new particles, specifically in the decay process of Σ→pμμ. Collaborating with C.Q. Geng from National Tsing Hua University, key findings are presented, including experimental results and theoretical comparisons. The research discusses the potential existence of dark matter particles and axion-like particles, as well as lighter scalar bosons and intermediate bosons identified in other collaborations. The implications of these findings on effective Hamiltonians, amplitude calculations, and form factors are highlighted to further understand the particle physics landscape.

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Constraints on New Particle in Σ→pμμ: Insights from Experiment and Theoretical Models

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Constraints on the new particle in Σ→ pμμ Yu-Kuo Hsiao With the collaborator C.Q. Geng National Tsing-Huang University, Taiwan Based on ph/0509175, to appear in PLB. • Experiment • Constraints from other modes • Summary • Comparison
New particles with different masses? • Dark matter particle with mass of (ph/0508572) • Axion-like particle with mass of 0.7 meV-2 meV from PVLAS Collaboration. (ex/0507107) • A light scalar boson of mass 1-10 MeV, accounting for the fluxes of 511 keV gamma ray.(PLB 624, 162) • Intermediate boson with mass of 214.3 MeV from HyperCP Collaboration. (PRL94, 021801)
Experiment