Charged Dark Matter in Supersymmetric Twin Higgs models

Supersymmetric Twin Higgs models ameliorate the fine-tuning of the electroweak scale originating from the heavy scalar top partners required by the non-discovery of them at the Large Hadron Collider. If the Lightest Supersymmetric Particle resides in the twin sector, it may play the role of dark matter even if it is charged under twin gauge interactions. We show that the twin stau is a viable candidate for charged dark matter, even if the twin electromagnetic gauge symmetry is unbroken, with thermal relic abundance that naturally matches the observed dark matter abundance. A wide parameter space satisfies all the experimental constraints including those on dark matter self-interactions. Twin stau dark matter can be observed in future direct detection experiments such as LUX-ZEPLIN. The stau has a mass in the range of 300-500 GeV, and in the minimal scenario, has a decay length long enough to be observed as a disappearing track or a long-lived particle at the Large Hadron Collider.超对称双希格斯模型（Supersymmetric Twin Higgs models）可缓解因大型强子对撞机（Large Hadron Collider）未发现重标量顶夸克伴子而引发的电弱能标精细调节问题。若最轻超对称粒子（Lightest Supersymmetric Particle）存在于双扇区中，即使其在双规范相互作用下带电，仍可充当暗物质。我们证明，即使双电磁规范对称性未破缺，双τ子（twin stau）仍可作为带电暗物质的可行候选体，其热遗留丰度可自然契合观测到的暗物质丰度。存在宽泛的参数空间可满足包括暗物质自相互作用约束在内的所有实验限制。双τ子暗物质可在未来的直接探测实验（如LUX-ZEPLIN）中被观测到。该τ子的质量处于300~500 GeV区间，在最简情景下，其衰变长度足够长，可在大型强子对撞机中被观测为消失径迹或长寿命粒子。