Observation of the Radiative Decays of ϒ(1S) to χ_{c1}.
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DOI: 10.1103/physrevlett.124.122001
Abstract: We report the first observation of the radiative decay of the ϒ(1S) into a charmonium state. The significance of the observed signal of ϒ(1S)→γχ_{c1} is 6.3 standard deviations including systematics. The branching fraction is calculated… read more here.
Keywords: observation radiative; radiative decays;