在BESIII探测器上探测轻亲轻子规范玻色子
Detecting light leptophilic gauge boson at BESIII detector
摘要：
$ O(GeV)$额外的$ U(1)$规范玻色子被称为U玻色子，被认为是轻子和暗物质（DM）之间相互作用的媒介，以解释PAMELA和ATIC的观测结果。在这类模型中，额外的U（1）规范群可以选择为$U(1)_{L_i-L_j}$，其中$L_i$是$i-$第代轻子数.该模型提供了实验所需的暗物质遗迹密度和增强因子。本文通过过程$ e^ + e^ - \to Uγ$、$U\to e^+e^-$、$U\to μ^+μ^-$和$U\to ν\overlineν$研究了这类U玻色子在BESIII探测器上的可观测性。在U玻色子衰变为中微子的不可见通道中，由于标准模型背景较低，BESIII可以测量到额外的$ U(1)$到$ O(10^{- 4}) \sim O(10^{- 5})$的耦合。在U玻色子衰变为带电轻子对的可见光通道中，由于存在较大的不可约QED背景，BESIII只能测量到$ O(10^{- 3}) \sim O(10^{- 4})$以下的耦合。
英文摘要：
The $ O(GeV)$ extra $ U(1)$ gauge boson named U-boson, has been proposed to mediate the interaction among leptons and dark matter (DM), in order to account for the observations by PAMELA and ATIC. In such kind of models, the extra U(1) gauge group can be chosen as $U(1)_{L_i-L_j}$ with $L_i$ the $i-$th generation lepton number. This anomaly-free model provides appropriate dark matter relic density and boost factor required by experiments. In this work the observability of such kind of U-boson at BESIII detector is investigated through the processes $ e^ + e^ - \to Uγ$, followed by $U\to e^+e^-$, $U\to μ^+μ^-$ and $U\to ν\overlineν$. In the invisible channel where U-boson decays into neutrinos, BESIII can measure the coupling of the extra $ U(1)$ down to $ O(10^{- 4}) \sim O(10^{- 5})$ because of the low Standard Model backgrounds. In the visible channel where U-boson decays into charged lepton pair, BESIII can only measure the coupling down to $ O(10^{- 3}) \sim O(10^{- 4})$ due to the large irreducible QED backgrounds.
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