Search for η_c(2S)→ pp and branching fraction measurements of χ_cJ → pp via ψ(2S) radiative decays

2024/10/24 by BESIII Collaboration, Ablikim, M., Achasov, M. N. +648
#FOS: Physical sciences #High Energy Physics - Experiment (hep-ex)

paper · doi:10.48550/arxiv.2410.18464

Abstract

Using (27.12±0.14) × 10⁸ ψ(2S) events collected by the BESIII detector operating at BEPCII, we search for the decay η_c(2S)→ pp via the process ψ(2S)→ γη_c(2S), and only find a signal with a significance of 1.7 σ. The upper limit of the product branching fraction at the 90% confidence level is determined to be B(ψ(2S)→ γη_c(2S))× B(η_c(2S)→ pp)<2.4× 10^-7. The branching fractions of χ_cJ→ pp~(J=0,1,2) are also measured to be B(χ_c0→ pp)=(2.51±0.02±0.08)× 10^-4, B(χ_c1→ pp)=(8.16±0.09±0.25)× 10^-4, and B(χ_c2→ pp)=(8.33±0.09±0.22)× 10^-4, where the first uncertainty is statistical and the second systematic.

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