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Improved measurements of the Dalitz decays \(η/η'\rightarrowγ e^{+}e^{-}\)

By Besiii Collaboration and others
Based on a data sample of 10 billion \(J/\psi\) events collected with the BESIII detector, improved measurements of the Dalitz decays \(\eta/\eta'\rightarrow\gamma e^+e^-\) are performed, where the \(\eta\) and \(\eta'\) are produced through the radiative decays \(J/\psi\rightarrow\gamma \eta/\eta'\). The branching fractions of \(\eta\rightarrow\gamma e^+e^-\) and \(\eta'\rightarrow\gamma e^+e^-\) are measured to... Show more
April 5, 2024
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