Higgsino dark matter or not: Role of disappearing track searches at the LHC and future colliders
Higgsino dark matter or not: Role of disappearing track searches at the LHC and future colliders
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DOI：
10.1016/j.physletb.2018.03.088
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发表时间：
2017-03
影响因子：
4.4
通讯作者：
H. Fukuda;N. Nagata;H. Otono;S. Shirai
中科院分区：
文献类型：
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作者：
H. Fukuda;N. Nagata;H. Otono;S. Shirai
超对称标准模型中的希格斯诺被认为是宇宙中暗物质的有希望的候选者。其现象学性质受到类 Higgsino 状态下的高吉诺分数的强烈影响。如果这个相当大，换句话说，如果高吉诺质量小于O(10) TeV，我们可能会在未来的非加速器实验中探测希格斯诺暗物质，例如暗物质直接搜索和电偶极矩测量。另一方面，如果高吉诺重得多，那么在这些实验中就很难寻找希格斯诺。在这种情况下，由于缺乏高吉诺成分，中性希格斯诺子和带电希格斯诺子之间的质量差由电弱相互作用唯一确定为350 MeV左右，这使得较重的带电态寿命相当长，衰变长度约为1厘米。在这封信中，我们认为，如果我们只需要像素探测器中的两次命中，则可以在消失轨迹搜索中探测飞行长度为 O (1) cm 的带电粒子。即使在这种情况下，我们也可以借助位移顶点重建技术来减少背景事件。我们研究了这种搜索策略在大型强子对撞机和未来对撞机上针对希格斯诺暗物质场景的前景。发现几乎纯粹的希格斯诺确实在未来33 TeV对撞机实验的范围之内。然后我们讨论对撞机和非加速器实验之间的相互作用在测试希格斯诺暗物质场景中起着至关重要的作用。我们的消失轨道搜索策略还可以扩大纯维诺暗物质以及其他电弱荷电暗物质候选者的发现潜力。
Higgsino in supersymmetric standard models is known to be a promising candidate for dark matter in the Universe. Its phenomenological property is strongly affected by the gaugino fraction in the Higgsino-like state. If this is sizable, in other words, if gaugino masses are less than O (10) TeV, we may probe the Higgsino dark matter in future non-accelerator experiments such as dark matter direct searches and measurements of electric dipole moments. On the other hand, if gauginos are much heavier, then it is hard to search for Higgsino in these experiments. In this case, due to a lack of gaugino components, the mass difference between the neutral and charged Higgsinos is uniquely determined by electroweak interactions to be around 350 MeV, which makes the heavier charged state rather long-lived, with a decay length of about 1 cm. In this letter, we argue that a charged particle with a flight length of O (1) cm can be probed in disappearing-track searches if we require only two hits in the pixel detector. Even in this case, we can reduce background events with the help of the displaced-vertex reconstruction technique. We study the prospects of this search strategy at the LHC and future colliders for the Higgsino dark matter scenario. It is found that an almost pure Higgsino is indeed within the reach of the future 33 TeV collider experiments. We then discuss that the interplay among collider and non-accelerator experiments plays a crucial role in testing the Higgsino dark matter scenarios. Our strategy for disappearing-track searches can also enlarge the discovery potential of pure wino dark matter as well as other electroweak-charged dark matter candidates.