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Seong, I. S.*; 谷田 聖; Belle Collaboration*; 他191名*
Physical Review Letters, 122(1), p.011801_1 - 011801_8, 2019/01
被引用回数:16 パーセンタイル:74.55(Physics, Multidisciplinary)We report on the first Belle search for a light -odd Higgs boson, , that decays into low mass dark matter, , in final states with a single photon and missing energy. We search for events produced via the dipion transition , followed by the on-shell process with , or by the off-shell process . Utilizing a data sample of 157.3 10 decays, we find no evidence for a signal. We set limits on the branching fractions of such processes in the mass ranges GeV/ and GeV/. We then use the limits on the off-shell process to set competitive limits on WIMP-nucleon scattering in the WIMP mass range below 5 GeV/.