Using a sample of 1.06×108ψ(3686) events collected with the BESIII detector at BEPCII, the decays ηc(2S)→pp̄ and hc→pp̄ are searched for, where ηc(2S) and hc are reconstructed in the decay chains ψ(3686) →γηc(2S), ηc(2S)→pp̄ and ψ(3686)→π0hc, hc→pp̄, respectively. No significant signals are observed. The upper limits of the product branching fractions are determined to be B(ψ(3686)→γηc(2S)) ×B(ηc(2S)→pp̄)<1.4×10-6 and B(ψ(3686)→π0hc)×B(hc→pp̄) <1.3×10-7 at the 90% C.L.. The branching fractions for χcJ→pp̄ (J=0, 1, 2) are also measured to be (24.5±0.8±1.3,8.6±0.5±0.5,8.4±0.5±0.5) ×10-5, which are the world's most precise measurements.
Search for η_c(2S)h_c → ppbar decays and measurements of the χ_cJ → ppbar branching fractions
DESTEFANIS, MARCO GIOVANNI;GRECO, Michela;MAGGIORA, MARCO;SPATARO, STEFANO GIOVANNI;
2013-01-01
Abstract
Using a sample of 1.06×108ψ(3686) events collected with the BESIII detector at BEPCII, the decays ηc(2S)→pp̄ and hc→pp̄ are searched for, where ηc(2S) and hc are reconstructed in the decay chains ψ(3686) →γηc(2S), ηc(2S)→pp̄ and ψ(3686)→π0hc, hc→pp̄, respectively. No significant signals are observed. The upper limits of the product branching fractions are determined to be B(ψ(3686)→γηc(2S)) ×B(ηc(2S)→pp̄)<1.4×10-6 and B(ψ(3686)→π0hc)×B(hc→pp̄) <1.3×10-7 at the 90% C.L.. The branching fractions for χcJ→pp̄ (J=0, 1, 2) are also measured to be (24.5±0.8±1.3,8.6±0.5±0.5,8.4±0.5±0.5) ×10-5, which are the world's most precise measurements.File | Dimensione | Formato | |
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PhysRevD.88.112001.pdf
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PRD88.112001.arxiv.pdf
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