The study of $U$-boson from ${\pi }^0$-meson decays at HIAF energy

Abstract

Within the frame of LDM (light dark matter)-model, the LDM exchange particle $U$-boson (with mass 10-100 MeV) can be produced from many meson decay process so it attracts a lot of attention. Considering the merit of searching the $U$-boson from ${\pi }^0$ decay, the momentum spectra of light spin-1 vector $U$-boson from decay channel ${\pi }^0\to \gamma U$ and the energy spectra of positron decay from $U\to e^{+}{e}^{-}$ at beam energy of 5-10 GeV are first presented by using a relativistic transport (ART) model. Moreover,the feasibility and rationality of searching the $U$-boson in the experiment at HIAF energy are discussed, which will be an important promotion to understand and ultimately detect the $U$-boson, both in theory and experiment.

Comments: This paper has been withdrawn by the author due to some passages considered to be indecent need to be deleted. Besides, we want to add some important results, such as the plot of limit of the decay branching ratio as a function of the U boson