NA48和NA62实验在π0衰变中寻找暗光子
Search for dark photons in π0 decays at NA48 and NA62
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摘要: 2003到2004年间,CERN的NA48/2实验收集了169×107个完全重建的π0→γe+e-事例,动量范围在mee>10 MeV/c2,本底污染可忽略.该样本通过分析衰变链π0→γA′,A′→e+e-来寻找暗光子.然而并没有观测到信号,本文给出暗光子质量mA′和混合参数2的排除限.Abstract: The NA48/2 experiment at CERN collected, between 2003 and 2004, 1.69×107 fully reconstructed π0→γe+e- in the kinematic range mee>10 MeV/c2, with a negligible background contamination. The sample is analysed to search for the presence of dark photons (A′) via the decay chain π0→γA′, A′→e+e-. No signal has been observed, and the exclusion limits on space of the dark photon mass mA′ and the mixing parameter 2 are reported.
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