论文标题
原始载体玻色子可以解释原子异常吗？
Can a protophobic vector boson explain the ATOMKI anomaly?
论文作者
论文摘要
2016年，Atomki合作宣布[PRL {\ BF 116}，042501（2016）]观察到$ e^+ - e^ - $ e^+ - e^ - $^8 $中的$ e^+ - e^ - 是$^8 $中的一个是核^7 $ li目标上的事件Proton probion togent the $^7 $ li目标。随后提出了许多超出标准模型物理学解释。一种流行的理论是，异常是由核过渡中的原始载体玻色子（$ x $）创建，质量约为17 meV [e.g.，prl \ {\ bf 117}，071803（2016）]。我们通过得出光子和$ x $耦合与核子之间的同胞关系来研究这一假设。这使我们能够找到Protophic $ x $生产截面与用于测量光子生产的简单关系。净结果是，$ x $的产量由$ e1^x $和$ l1^x $（横向和纵向电偶极子）和$ c1^x $（电荷偶极）引起的直接过渡主导，而无需经过任何核共振（即bremsstrahlung辐射），并具有平滑的能量依赖性，这些能量依赖于所有proton beains for proton bebies for proton beb yester thresh thresh thresh thresh thresh thresh thresh thresh。这与实验观测相矛盾，并使原始载体玻色子的解释无效。
In 2016, the ATOMKI collaboration announced [PRL {\bf 116}, 042501 (2016)] observing an unexpected enhancement of the $e^+-e^-$ pair production signal in one of the $^8$Be nuclear transitions induced by an incident proton beam on a $^7$Li target. Many beyond-standard-model physics explanations have subsequently been proposed. One popular theory is that the anomaly is caused by the creation of a protophobic vector boson ($X$) with a mass around 17 MeV [e.g., PRL\ {\bf 117}, 071803 (2016)] in the nuclear transition. We study this hypothesis by deriving an isospin relation between photon and $X$ couplings to nucleons. This allows us to find simple relations between protophobic $X$-production cross sections and those for measured photon production. The net result is that $X$ production is dominated by direct transitions induced by $E1^X$ and $L1^X$ (transverse and longitudinal electric dipoles) and $C1^X$ (charge dipole) without going through any nuclear resonance (i.e. Bremsstrahlung radiation) with a smooth energy dependence that occurs for all proton beam energies above threshold. This contradicts the experimental observations and invalidates the protophobic vector boson explanation.
