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

6533b82cfe1ef96bd128f5b3

RESEARCH PRODUCT

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

S. Cuen-rochin S. Cuen-rochin M. Blecher D. Vavilov Song Chen Masaharu Aoki D. Protopopescu Y. Igarashi L. S. Littenberg P. Gumplinger A. Sher Luca Doria Luca Doria C. Malbrunot R. E. Mischke T. Sullivan Shintaro Ito D. Vom Bruch T. Numao Dave Britton Alexis A. Aguilar-arevalo S. H. Kettell Douglas Bryman Douglas Bryman J. R. Comfort Leonid Kurchaninov Ahmed Hussein Ahmed Hussein

subject

Physics Crystallography Pion 010308 nuclear & particles physics Branching fraction Full data High Energy Physics::Phenomenology 0103 physical sciences 010306 general physics Coupling (probability)01 natural sciences Boson

description

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+νμ) in the mass range 0<mX<120 MeV/c2 and a first result for Γ(π+→μ+νX)/Γ(π+→μ+νμ) in the region 0<mX<33.9 MeV/c2 were obtained. The Majoron-neutrino coupling model was also constrained using the current experimental result of the π+→e+νe(γ) branching ratio.

year	journal	country	edition	language
2021-03-16	Physical Review D

https://doi.org/10.1103/physrevd.103.052006

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