Search for three body pion decays π⁺→l⁺νX

2021/01/31 by A. Aguilar-Arevalo, M. Aoki, M. Blecher +21 · 2 citations
Physics and Astronomy · #hep-ex

paper · pdf · doi:10.1103/physrevd.103.052006

published as Phys. Rev. D 103, 052006 (2021) · 8 pages, 7 figures. arXiv admin note: text overlap with arXiv:2006.00389

arxiv created 2021/02/09 · arxiv updated 2021/03/24

Abstract

The three body pion decays π⁺→l⁺νX~(l=e,μ), where X is a weakly interacting neutral boson, were searched for using the full data set from the PIENU experiment. An improved limit on Γ(π⁺→e⁺νX)/Γ(π⁺→μ⁺ν_μ) in the mass range 0<m_X<120 MeV/c² and a first result for Γ(π⁺→μ⁺νX)/Γ(π⁺→μ⁺ν_μ) in the region 0<m_X<33.9 MeV/c² were obtained. The Majoron-neutrino coupling model was also constrained using the current experimental result of the π⁺→e⁺ν_e(γ) branching ratio.

Citations

• Search for the rare decays π⁺ → μ⁺ν_μνν and π⁺ → e⁺ν_eνν

Cited by

• Photon Excess from Dark Matter and Neutrino Scattering at MiniBooNE and MicroBooNE
• European Strategy for Particle Physics Update -- PIONEER: a next generation rare pion decay experiment