SHADOWS（使用SPS搜索隐藏和黑暗物体）
SHADOWS (Search for Hidden And Dark Objects With the SPS)
摘要：
我们提出了一个新的束流转储实验，阴影，寻找各种各样的弱相互作用的粒子可能产生的400 GeV的质子束与高Z材料转储的相互作用。SHADOWS将使用从CERN SPS中提取的400 GeV初级质子束，该SPS目前为CERN北区的NA 62实验提供服务，并将在P42束线以束流收集模式运行时获取离轴数据。SHADOWS每年可以在目标上积累多达2 × 10^19个质子，并在宇宙学和天体物理学观测所允许的参数空间中扩展了对各种各样的FIP的探索，这些FIP的质量范围远远超出了MeV-GeV的最先进水平。到目前为止，新的弱相互作用的轻粒子与标准模型粒子的相互作用强度的最强边界存在于K介子质量以下;超过这个阈值，边界显著减弱。阴影可以在这个尚未被探索的领域迈出重要的一步，如果它们的质量介于K介子和美质量之间，它们就有可能被发现。如果没有发现信号，SHADOWS将根据模型和场景，在相同质量范围内将它们与SM粒子的耦合限制在1到4个数量级之间。
英文摘要：
We propose a new beam-dump experiment, SHADOWS, to search for a large variety of feebly-interacting particles possibly produced in the interactions of a 400 GeV proton beam with a high-Z material dump. SHADOWS will use the 400 GeV primary proton beam extracted from the CERN SPS currently serving the NA62 experiment in the CERN North area and will take data off-axis when the P42 beam line is operated in beam-dump mode. SHADOWS can accumulate up to a ~2 x10^19 protons on target per year and expand the exploration for a large variety of FIPs well beyond the state-of-the-art in the mass range of MeV-GeV in a parameter space that is allowed by cosmological and astrophysical observations. So far the strongest bounds on the interaction strength of new feebly-interacting light particles with Standard Model particles exist up to the kaon mass; above this threshold the bounds weaken significantly. SHADOWS can do an important step into this still poorly explored territory and has the potential to discover them if they have a mass between the kaon and the beauty mass. If no signal is found, SHADOWS will push the limits on their couplings with SM particles between one and four orders of magnitude in the same mass range, depending on the model and scenario.
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