论文标题
在Besiii和Belle II中使用$ J/ψ$搜索新的Light Vector Boson
Search for new light vector boson using $J/Ψ$ at BESIII and Belle II
论文作者
论文摘要
我们研究了光线矢量玻色子的各种搜索策略$ \ Mathcal {o}（10）〜{\ rm mev} $质量范围，使用$ j/ψ$相关的频道在besiii和belle ii and belle ii：（i）$ j/ψ\ toη_cx $ to p x $ 10^$ 10^{10} $ j/s $ j/c $ j/cat， +X) +\ell \bar{\ell}$ production at Belle~II, and (iii) $J/Ψ+X$ with the displaced vertex in $X\to e^+e^-$ decay are analyzed and the future sensitivities at Belle II with 50 ${\rm ab}^{-1}$ luminosity are comprehensively studied.通过要求位移的顶点在梁管内，第三种方法几乎无背景分析，并且可以在前所未有的范围内探测矢量玻色子电子耦合和矢量玻色子质量，$ 10^{ - 4} \ leq | \ leq | \ varepsilon_e | \ leq 10^{ - 3} $和$ 9〜 {\ rm mev} \ leq m_x \ leq 100 {\ rm mev} $，带有50 $ {\ rm ab}^{ - 1} $在Belle II上。这涵盖了$^8 {\ rm be}^*$ Anomaly最近由Atomki实验报告的$^8 {\ rm be}^*$的信号区域，并使用$ m_x \ simeq 17〜 {\ rm mev} $。
We investigate various search strategies for light vector boson $X$ in $\mathcal{O}(10)~{\rm MeV}$ mass range using $J/Ψ$ associated channels at BESIII and Belle II: (i) $J/Ψ\to η_c X$ with $10^{10} J/Ψ$s at BESIII, (ii) $J/Ψ(η_c +X) +\ell \bar{\ell}$ production at Belle~II, and (iii) $J/Ψ+X$ with the displaced vertex in $X\to e^+e^-$ decay are analyzed and the future sensitivities at Belle II with 50 ${\rm ab}^{-1}$ luminosity are comprehensively studied. By requiring the displaced vertex to be within the beam pipe, the third method results in nearly background-free analysis, and the vector boson-electron coupling and the vector boson mass can be probed in the unprecedented range, $10^{-4}\leq |\varepsilon_e| \leq 10^{-3}$ and $9~{\rm MeV}\leq m_X\leq 100 {\rm MeV}$ with 50 ${\rm ab}^{-1}$ at Belle II. This covers the favored signal region of $^8{\rm Be}^*$ anomaly recently reported by Atomki experiment with $m_X \simeq 17~{\rm MeV}$.
