K~+ meson yields by proton beams on low-Z targets and production of U-boson in kaon rare decays

摘要

The production of K~+-meson in protonlow-Z targets (~(12)C,~7Li) reactions for beam energies T_p = 2.315 GeV is analyzed on the basis of a relativistic transport (ART) model means. The double differential cross-section and the ratio of K~+ production with various targets for different emission angles are calculated. Moreover, the light neutral vector boson U from kaon decays is investigated and the momentum spectra of the U-boson with mass 10100MeV are obtained. It is found that the shapes of U-bosons momentum spectra distributions are practically independent of its mass distributions but sensitive to the emission angle. Furthermore, the decay channel U → e~+e~? is considered and the energy spectra of positron from U-boson decays are first presented, which will be conduced to search for the U-boson in experiments and understand the light dark-matter particles.