对耦合到$L_μ$ - $L_τ$电流的轻$Z'$玻色子的Borexino测量的精细约束
Refining constraints from Borexino measurements on a light $Z'$-boson coupled to $L_μ$-$L_τ$ current
摘要：
FNAL最近对$(g-2)_μ$ μ子异常的确认为μ子部门可能存在超越标准模型的新物理提供了强有力的证据。因此，它是值得重新审视现有的实验模型的限制，提出理论上一致的解释异常。在这项工作中，我们指出，占太阳中微子的波包（质量状态）之间的相干性的损失是重要的设置限制任何模型与新的味道敏感的耦合在中微子部门。考虑到这种影响，并考虑更准确地从BOREXINO测量的$^7$ Be太阳中微子相互作用率的实验约束，我们修正了以前放置在耦合的光$Z'$ $L_μ$ - $L_τ$电流的μ子$(g-2)_μ$相关的参数空间的限制。
英文摘要：
The recent confirmation by FNAL of the $(g-2)_μ$ muon anomaly gives strong evidence for the possible existence of new physics beyond the Standard Model in the muon sector. Thus it is worthy to revisit the existing experimental constraints on models suggesting theoretically consistent explanations of the anomaly. In this work, we point out that accounting for the loss of coherence between the wave packets(mass states) of solar neutrinos is important for setting limits on any model with new flavor-sensitive couplings in the neutrino sector. By taking into account this effect and considering more accurately the experimental constraints from the BOREXINO measurement of the $^7$Be solar neutrino interaction rate we corrected the limits previously placed on the coupling of the light $Z'$ to $L_μ$-$L_τ$ current in the parameter space relevant to the muon $(g-2)_μ$.
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