Cazzaniga C, Odagiu P, Depero E, Molina Bueno L, Andreev Yu M, Banerjee D, Bernhard J, Burtsev V E, Charitonidis N, Chumakov A G, Cooke D, Crivelli P, Dermenev A V, Donskov S V, Dusaev R R, Enik T, Feshchenko A, Frolov V N, Gardikiotis A, Gerassimov S G, Girod S, Gninenko S N, Hösgen M, Kachanov V A, Karneyeu A E, Kekelidze G, Ketzer B, Kirpichnikov D V, Kirsanov M M, Kolosov V N, Konorov I V, Kovalenko S G, Kramarenko V A, Kravchuk L V, Krasnikov N V, Kuleshov S V, Lyubovitskij V E, Lysan V, Matveev V A, Mikhailov Yu V, Peshekhonov D V, Polyakov V A, Radics B, Rojas R, Rubbia A, Samoylenko V D, Shchukin D, Sieber H, Tikhomirov V O, Tlisova I V, Tlisov D A, Toropin A N, Trifonov A Yu, Vasilishin B I, Arenas G Vasquez, Volkov P V, Volkov V Yu, Ulloa P
ETH Zürich Institute for Particle Physics and Astrophysics, 8093 Zurich, Switzerland.
Institute of Physics, École polytechnique fédérale de Lausanne (EPFL), Lausanne, Switzerland.
Eur Phys J C Part Fields. 2021;81(10):959. doi: 10.1140/epjc/s10052-021-09705-5. Epub 2021 Oct 30.
We report the results of a search for a new vector boson ( ) decaying into two dark matter particles of different mass. The heavier particle subsequently decays to and an off-shell Dark Photon . For a sufficiently large mass splitting, this model can explain in terms of new physics the recently confirmed discrepancy observed in the muon anomalous magnetic moment at Fermilab. Remarkably, it also predicts the observed yield of thermal dark matter relic abundance. A detailed Monte-Carlo simulation was used to determine the signal yield and detection efficiency for this channel in the NA64 setup. The results were obtained re-analyzing the previous NA64 searches for an invisible decay and axion-like or pseudo-scalar particles . With this method, we exclude a significant portion of the parameter space justifying the muon g-2 anomaly and being compatible with the observed dark matter relic density for masses from 2 up to 390 MeV and mixing parameter between and .
我们报告了一项对新矢量玻色子（ ）衰变为两个质量不同的暗物质粒子 的搜索结果。较重的 粒子随后衰变为 和一个离壳暗光子 。对于足够大的质量分裂，该模型可以用新物理来解释费米实验室最近在μ子反常磁矩中观察到的已确认差异。值得注意的是，它还预测了观测到的热暗物质遗迹丰度产量。使用详细的蒙特卡罗模拟来确定NA64装置中该通道的信号产量和探测效率。通过重新分析之前NA64对不可见衰变 和类轴子或赝标量粒子 的搜索获得了结果。用这种方法，我们排除了很大一部分参数空间，这些参数空间为μ子g - 2反常提供了依据，并且对于质量从2 MeV到390 MeV以及 和 之间的混合参数 与观测到的暗物质遗迹密度兼容。
