Observation of the Electromagnetic Dalitz Transition h_c → e^+e^-η_c

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arxiv（2024）

Cited 0|Views14

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Abstract

Using (27.12± 0.14)×10^8 ψ(3686) decays and data samples of e^+e^- collisions with √(s) from 4.130 to 4.780 GeV collected with the BESIII detector, we report the first observation of the electromagnetic Dalitz transition h_c→ e^+e^-η_c with a statistical significance of 5.4σ. We measure the ratio of the branching fractions ℬ(h_c→ e^+e^-η_c)/ℬ(h_c→γη_c) separately for the h_c samples produced via ψ(3686)→π^0h_c and e^+e^-→π^+π^-h_c. The average ratio is determined to be (0.59±0.10(stat.)±0.04(syst.))%, where the uncertainty includes both statistical and systematic components.

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