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.File in questo prodotto:
| File | Dimensione | Formato | |
|---|---|---|---|
|
PhysRevD.111.012003.pdf
Accesso aperto
Dimensione
420.34 kB
Formato
Adobe PDF
|
420.34 kB | Adobe PDF | Visualizza/Apri |
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.



