首页|Novel method for identifying the heaviest QED atom

Novel method for identifying the heaviest QED atom

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QED atoms are composed of unstructured and point-like lepton pairs bound together by the electromag-netic force.The smallest and heaviest QED atom is formed by a τ+τ-pair.Currently,the only known atoms of this type are the e+e-and μ+e-atoms,which were discovered 64 years ago and remain the sole examples found thus far.We demonstrate that the Jτ(τ+τ-atom with JPC=1--)atom signal can be observed with a significance larger than 5σ including both statistical and systematic uncertainties,via.the process e+e-→X+Y-(E)(X,Y=e,μ,π,K,or ρ,and(E) is the missing energy due to unobserved neutri-nos)with 1.5 ab-1 data taken around the τ pair production threshold.The τ lepton mass can be measured with a precision of 1 keV with the same data sample.This is within one year's running time of the pro-posed super tau-charm facility in China or super charm-tau factory in Russia.

QED atomTau leptone+e-annihilationSTCFSCTF

Jing-Hang Fu、Sen Jia、Xing-Yu Zhou、Yu-Jie Zhang、Cheng-Ping Shen、Chang-Zheng Yuan

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School of Physics,Beihang University,Beijing 100083,China

School of Physics,Southeast University,Nanjing 211189,China

School of Physics and Electronic Technology,Liaoning Normal University,Dalian 116029,China

Peng Huanwu Collaborative Center for Research and Education,Beihang University,Beijing 100191,China

Key Laboratory of Nuclear Physics and Ion-beam Application(MOE)and Institute of Modern Physics,Fudan University,Shanghai 200443,China

School of Physics,Henan Normal University,Xinxiang 453007,China

Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China

University of Chinese Academy of Sciences,Beijing 100049,China

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国家重点研发计划国家自然科学基金国家自然科学基金国家自然科学基金国家自然科学基金国家自然科学基金国家自然科学基金中央高校基本科研业务费专项

2020YFA0406300119750761216114100812135005120750181200504012335004RF1028623046

2024

科学通报(英文版)
中国科学院

科学通报(英文版)

CSTPCD
ISSN:1001-6538
年,卷(期):2024.69(10)
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