在BABAR上寻找μ子暗力
Search for a muonic dark force at BABAR
摘要:
许多超越标准模型的物理模型都预言了新的阿贝尔力的存在,新的规范玻色子介导了“暗扇区”和标准模型之间的相互作用。本文利用BABAR实验收集的514 fb ~(-1)的数据,在e+e-> mu+mu-Z ',Z' -> mu+mu-反应中寻找了只与第二代和第三代轻子耦合的暗玻色子Z'.在0.212 - 10 GeV范围内没有观察到Z'质量的显著信号。耦合参数g'的极限可低至7 × 10 ^-4,与先前从中微子实验中得出的结果相比,这一极限得到了改善。
英文摘要:
Many models of physics beyond the Standard Model predict the existence of new Abelian forces with new gauge bosons mediating interactions between "dark sectors" and the Standard Model. We report a search for a dark boson Z' coupling only to the second and third generations of leptons in the reaction e+e- -> mu+mu- Z', Z' -> mu+mu- using 514 fb-1 of data collected by the BABAR experiment. No significant signal is observed for Z' masses in the range 0.212 - 10 GeV. Limits on the coupling parameter g' as low as 7x10^-4 are derived, leading to improvements in the bounds compared to those previously derived from neutrino experiments.
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