Department of Physics, Boston University, Boston, Massachusetts 02215, USA.
Kamioka Observatory, Institute for Cosmic Ray Research, University of Tokyo, Kamioka, Gifu 506-1205, Japan.
Phys Rev Lett. 2018 Jun 1;120(22):221301. doi: 10.1103/PhysRevLett.120.221301.
A search for boosted dark matter using 161.9 kt yr of Super-Kamiokande IV data is presented. We search for an excess of elastically scattered electrons above the atmospheric neutrino background, with a visible energy between 100 MeV and 1 TeV, pointing back to the Galactic center or the Sun. No such excess is observed. Limits on boosted dark matter event rates in multiple angular cones around the Galactic center and Sun are calculated. Limits are also calculated for a baseline model of boosted dark matter produced from cold dark matter annihilation or decay. This is the first experimental search for boosted dark matter from the Galactic center or the Sun interacting in a terrestrial detector.
利用 Super-Kamiokande IV 数据 161.9 kt·yr，我们进行了暗物质增强子的搜索。我们在大气中微子背景之上，搜寻能量在 100 MeV 到 1 TeV 之间，来自银河系中心或太阳方向的弹性散射电子的多余事例。但没有观测到这样的事例。我们计算了银河系中心和太阳周围多个角锥内增强暗物质事例率的限制。我们还计算了由冷暗物质湮灭或衰变产生的增强暗物质的基线模型的限制。这是首次在地面探测器中对来自银河系中心或太阳的增强暗物质的相互作用进行的实验搜索。
