论文标题
Xenon1t中的电子后坐力事件过多
Excess Electronic Recoil Events in XENON1T
论文作者
论文摘要
我们报告了对新物理学的搜索结果，这些物理学具有低能电子后坐力数据，该物理数据记录了Xenon1t检测器。在1到30 keV之间的$ 76 \ pm2 $事件/（t y keV）的空前率为0.65 t-y和前所未有的较低背景速率，数据可实现对太阳轴的敏感搜索，增强的中微子磁矩和波音性暗物质。在低能量下观察到过多的已知背景，在2至3 KEV之间观察到最突出的背景。太阳轴模型具有3.4 $σ$的显着性，据报道，与电子，光子和核子的轴支耦合有关3D 90％的置信表面。 This surface is inscribed in the cuboid defined by $g_{ae}<3.8 \times 10^{-12}$, $g_{ae}g_{an}^{eff}<4.8\times 10^{-18}$, and $g_{ae}g_{aγ}<7.7\times10^{-22} gev^{ - 1} $，并排除$ g_ {ae} = 0 $或$ g_ {ae} g_} g_ {aγ} = g_ {ae} g_ {ae} g_ {an}^an}^{eff} = 0 $。报告了中微子磁矩信号在3.2 $σ$下的背景和置信区间（在（1.4,2.9）\ times10^{ - 11}μ_b$（90％c.l.）中。这两种结果都具有恒星约束的强度张力。多余的也可以用3.2 $σ$的$β$衰减，痕量量既无法确认也不能被当前对其生产和还原机制的了解所排除。如果拟合中包含了一个不约束的tri骨组件，太阳轴和中微子磁矩假设的重要性分别降低至2.0 $σ$和0.9 $σ$。关于玻色粒暗物质，多余的人偏向于（$ 2.3 \ pm0.2 $）KEV（68％C.L.）的单晶峰，具有3.0 $σ$ Global（4.0 $σ$ local）的意义。我们还考虑了$^{37} $ ar可能存在于检测器中并产生2.82 KEV峰的可能性。与Tritium相反，$^{37} $ AR浓度可以严格限制，并且被认为可以忽略不计。
We report results from searches for new physics with low-energy electronic recoil data recorded with the XENON1T detector. With an exposure of 0.65 t-y and an unprecedentedly low background rate of $76\pm2$ events/(t y keV) between 1 and 30 keV, the data enables sensitive searches for solar axions, an enhanced neutrino magnetic moment, and bosonic dark matter. An excess over known backgrounds is observed at low energies and most prominent between 2 and 3 keV. The solar axion model has a 3.4$σ$ significance, and a 3D 90% confidence surface is reported for axion couplings to electrons, photons, and nucleons. This surface is inscribed in the cuboid defined by $g_{ae}<3.8 \times 10^{-12}$, $g_{ae}g_{an}^{eff}<4.8\times 10^{-18}$, and $g_{ae}g_{aγ}<7.7\times10^{-22} GeV^{-1}$, and excludes either $g_{ae}=0$ or $g_{ae}g_{aγ}=g_{ae}g_{an}^{eff}=0$. The neutrino magnetic moment signal is similarly favored over background at 3.2$σ$ and a confidence interval of $μ_ν \in (1.4,2.9)\times10^{-11}μ_B$ (90% C.L.) is reported. Both results are in strong tension with stellar constraints. The excess can also be explained by $β$ decays of tritium at 3.2$σ$ with a trace amount that can neither be confirmed nor excluded with current knowledge of its production and reduction mechanisms. The significances of the solar axion and neutrino magnetic moment hypotheses are reduced to 2.0$σ$ and 0.9$σ$, respectively, if an unconstrained tritium component is included in the fitting. With respect to bosonic dark matter, the excess favors a monoenergetic peak at ($2.3\pm0.2$) keV (68% C.L.) with a 3.0$σ$ global (4.0$σ$ local) significance. We also consider the possibility that $^{37}$Ar may be present in the detector and yield a 2.82 keV peak. Contrary to tritium, the $^{37}$Ar concentration can be tightly constrained and is found to be negligible.
