近日，意大利萨兰托大学和国立核子物理研究所的Natascia Vignaroli及其研究团队取得一项新进展。经过不懈努力，他们揭示多Tev介子对撞机的带电共振与MDM束缚态。相关研究成果已于2023年10月20日在国际知名学术期刊《高能物理杂志》上发表。
该团队发现，通过分析与标准模型W相关产物，可以直接探测到接近碰撞能量的多Tev质量值的带电共振，并且这种耦合与SM费米子的相互作用非常微弱，其强度仅为SM弱耦合的10-3 - 10-4倍。此外，研究人员发现，通过在动力学阈值以上运行并控制质心能量略高于最小暗物质（MDM）束缚态的质量，可以低统计量地探测到WIMP最小暗物质的带电束缚态，特别是马约拉纳费米子5-plet。
这一发现为寻找WIMPs提供了一种有趣的可能性，与寻找中性MDM束缚态分量的共振产物的工作相辅相成，而后者的搜索主要依赖于峰上搜索。实际上，对于5-plet最小暗物质，这种搜索策略比基于mono-X、质量缺失和轨道特征消失的WIMP搜索更为有效。
据悉，多TeV介子对撞机不仅在寻找新的重中性粒子方面非常有效，而且对于发现W′型带电玻色子也极具效率。
附：英文原文
Title: Charged resonances and MDM bound states at a multi-TeV muon collider
Author: Vignaroli, Natascia
Issue&Volume: 2023-10-20
Abstract: A multi-TeV muon collider proves to be very efficient not only for the search for new heavy neutral particles, but also for the discovery of charged bosons of the W′ type. We find that, by analyzing the associated production with a Standard Model W, charged resonances can be probed directly up to multi-TeV mass values close to the collision energy, and for very small couplings with the SM fermions, of the order of 10−3 − 10−4 times the SM weak coupling. Additionally, charged bound states of WIMP Minimal Dark Matter, specifically a Majorana fermionic 5-plet, can be discovered with low statistics by running above the kinematic threshold, at a center-of-mass energy just slightly above the mass of the MDM bound state. This opens up a very interesting possibility for the discovery of WIMPs, complementary to the search for the resonant production of the neutral MDM bound state component, which relies on an on-peak search. For 5-plet MDM, indeed, the proposed search strategy is more efficient than the WIMP searches based on mono-X, missing-mass and disappearing tracks signatures.
DOI: 10.1007/JHEP10(2023)121
Source: https://link.springer.com/article/10.1007/JHEP10(2023)121