通过对标量、赝标量、矢量和轴矢量的不可见衰变的搜索对电子g-2中新物理的限制

Constraints on New Physics in Electron g-2 from a Search for Invisible Decays of a Scalar, Pseudoscalar, Vector, and Axial Vector.

作者信息

Andreev Yu M, Banerjee D, Bernhard J, Burtsev V E, Chumakov A G, Cooke D, Crivelli P, Depero E, Dermenev A V, Donskov S V, Dusaev R R, Enik T, Charitonidis N, Feshchenko A, Frolov V N, Gardikiotis A, Gerassimov S G, 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, Molina Bueno L, Peshekhonov D V, Polyakov V A, Radics B, Rojas R, Rubbia A, Samoylenko V D, Sieber H, Shchukin D, Tikhomirov V O, Tlisova I, Toropin A N, Trifonov A Yu, Vasilishin B I, Volkov P V, Volkov V Yu

机构信息

Institute for Nuclear Research, 117312 Moscow, Russia.

CERN, European Organization for Nuclear Research, CH-1211 Geneva 23, Switzerland.

出版信息

Phys Rev Lett. 2021 May 28;126(21):211802. doi: 10.1103/PhysRevLett.126.211802.

DOI:10.1103/PhysRevLett.126.211802

PMID:34114842

Abstract

We performed a search for a new generic X boson, which could be a scalar (S), pseudoscalar (P), vector (V), or an axial vector (A) particle produced in the 100 GeV electron scattering off nuclei, e^{-}Z→e^{-}ZX, followed by its invisible decay in the NA64 experiment at CERN. No evidence for such a process was found in the full NA64 dataset of 2.84×10^{11} electrons on target. We place new bounds on the S, P, V, A coupling strengths to electrons, and set constraints on their contributions to the electron anomalous magnetic moment a_{e}, |Δa_{X}|≲10^{-15}-10^{-13} for the X mass region 1 MeV≲m_{X}≲1 GeV. These results are an order of magnitude more sensitive compared to the current accuracy on a_{e} from the electron g-2 experiments and recent high-precision determination of the fine structure constant.

摘要

我们对一种新的通用X玻色子进行了搜索，它可能是标量（S）、赝标量（P）、矢量（V）或轴矢量（A）粒子，由100 GeV电子与原子核散射产生，即e⁻Z→e⁻ZX，随后在欧洲核子研究组织（CERN）的NA64实验中发生不可见衰变。在目标上2.84×10¹¹个电子的完整NA64数据集中未发现此类过程的证据。我们对S、P、V、A与电子的耦合强度给出了新的限制，并对它们对电子反常磁矩aₑ的贡献设置了约束，对于1 MeV≲mₓ≲1 GeV的X质量区域，|Δaₓ|≲10⁻¹⁵ - 10⁻¹³。与目前电子g - 2实验对aₑ的精度以及近期精细结构常数的高精度测定相比，这些结果的灵敏度提高了一个数量级。