Using (27.12±0.14)×108 ψ(2S) events collected by the BESIII detector operating at BEPCII, we search for the decay ηc(2S)→pp¯ via the process ψ(2S)→γηc(2S) and only find a signal with a significance of 1.7σ. The upper limit of the product branching fraction at the 90% confidence level is determined to be B(ψ(2S)→γηc(2S))×B(ηc(2S)→pp¯)<2.4×10-7. The branching fractions of χcJ→pp¯ (J=0,1,2) are also measured to be B(χc0→pp¯)=(2.51±0.02±0.08)×10-4, B(χc1→pp¯)=(8.16±0.09±0.25)×10-4, and B(χc2→pp¯)=(8.33±0.09±0.22)×10-4, where the first uncertainty is statistical and the second systematic.

Search for ηcð2SÞ → p ¯p and branching fraction measurements of χ cJ → p ¯p via ψð2SÞ radiative decays

Amoroso, A.;Bianchi, F.;Destefanis, M.;De Mori, F.;Greco, M.;Maggiora, M.;Marcello, S.;Sosio, S.;Spataro, S.;
2025-01-01

Abstract

Using (27.12±0.14)×108 ψ(2S) events collected by the BESIII detector operating at BEPCII, we search for the decay ηc(2S)→pp¯ via the process ψ(2S)→γηc(2S) and only find a signal with a significance of 1.7σ. The upper limit of the product branching fraction at the 90% confidence level is determined to be B(ψ(2S)→γηc(2S))×B(ηc(2S)→pp¯)<2.4×10-7. The branching fractions of χcJ→pp¯ (J=0,1,2) are also measured to be B(χc0→pp¯)=(2.51±0.02±0.08)×10-4, B(χc1→pp¯)=(8.16±0.09±0.25)×10-4, and B(χc2→pp¯)=(8.33±0.09±0.22)×10-4, where the first uncertainty is statistical and the second systematic.
2025
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Ablikim, M.; Achasov, M. N.; Adlarson, P.; Afedulidis, O.; Ai, X. C.; Aliberti, R.; Amoroso, A.; Bai, Y.; Bakina, O.; Balossino, I.; Ban, Y.; Bao, H.-...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/2067830
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