标题： 轻引力微子在对撞机上的表现及对宇宙学的启示 显示英文标题

标题： Light Gravitinos at Colliders and Implications for Cosmology

摘要： 轻质量的引力微子，其质量在电子伏特到兆电子伏特范围内，在粒子物理中是很有说服力的，但由于早期宇宙的不确定性，它们作为暗物质候选者的地位变得模糊。我们研究了对撞机即将提供的数据如何澄清这一图景。轻质量的引力微子主要通过最轻超对称粒子的衰变产生，导致显著的信号，包括双光子、延迟且非指向的光子、弯曲的带电轨迹以及重的亚稳态带电粒子。我们发现，带有20/fb的Tevatron和带有1/fb的7 TeV LHC都可能看到数百个轻引力微子事件的证据。值得注意的是，这些对撞机数据也非常适合区分目前可行的轻引力微子情景，这对结构形成、暴胀和其他早期宇宙宇宙学有显著的影响。 显示英文摘要

摘要： Light gravitinos, with mass in the eV to MeV range, are well-motivated in particle physics, but their status as dark-matter candidates is muddled by early-Universe uncertainties. We investigate how upcoming data from colliders may clarify this picture. Light gravitinos are produced primarily in the decays of the next-to-lightest supersymmetric particle, resulting in spectacular signals, including di-photons, delayed and non-pointing photons, kinked charged tracks, and heavy metastable charged particles. We find that the Tevatron with 20/fb and the 7 TeV LHC with 1/fb may both see evidence for hundreds of light-gravitino events. Remarkably, this collider data is also well suited to distinguish between currently viable light-gravitino scenarios, with striking implications for structure formation, inflation, and other early-Universe cosmology.