Search for new hadronic decays of h_c and observation of h_c→ ppη

2022/03/20 by Ablikim, M., Achasov, M. N., Adlarson, P. +505
#FOS: Physical sciences #High Energy Physics - Experiment (hep-ex)

paper · doi:10.48550/arxiv.2203.10439

Abstract

A search for the hadronic decays of the h_c meson to the final states ppπ⁺π^-π⁰, ppη, and ppπ⁰ via the process ψ(3686) → π⁰h_c is performed using (4.48±0.03)×10⁸ ψ(3686) events collected with the BESIII detector. The decay channel h_c→ ppη is observed for the first time with a significance greater than 5σ and a branching fraction of ( 6.41 ± 1.74 ± 0.53 ± 1.00 ) × 10 ^-4, where the uncertainties are statistical, systematic, and that from the branching fraction of ψ(3686)→π⁰h_c. Strong evidence for the decay h_c → ppπ⁺π^-π⁰ is found with a significance of 4.9σ and a branching fraction of ( 3.84 ± 0.83 ±0.69 ± 0.58 ) × 10 ^{- 3}. The significances include systematic uncertainties. No clear signal of the decay h_c→ ppπ⁰ is found, and an upper limit of 6.59× 10^-4 on its branching fraction is set at the 90% confidence level.

Related

• Search for the decay h_c→π⁰J/ψ
• Evidence of the h_c→ K_S⁰ K⁺π^-+c.c. decay
• Search for χ_c1→ π⁺π^-η_c via ψ(3686)→γχ_c1
• Search for η_c(2S)→ pp and branching fraction measurements of χ_cJ → pp via ψ(2S) radiative decays
• Measurement of the Branching Fraction for the Decay χ_cJ→ ppηπ⁰