Using (2712.4 ± 14.3) × 106ψ(3686) candidates collected by the BESIII detector operating at the BEPCII storage ring, the decays χcJJ=012→pp¯ηη are observed for the first time through the radiative transition ψ(3686) → γχcJ. The statistical significances for χcJ signals are all larger than 5σ. The branching fractions of χc0,1,2→pp¯ηη are determined to be (5.75 ± 0.59 ± 0.42) × 10−5, (1.40 ± 0.33 ± 0.17) × 10−5, and (2.64 ± 0.40 ± 0.27) × 10−5, respectively, where the first uncertainties are statistical and the second systematic. No evident resonant structures are found in the pp¯ and pη/p¯η systems.
Observation of χcJJ=012→pp¯ηη
Garzia, I.;
2025
Abstract
Using (2712.4 ± 14.3) × 106ψ(3686) candidates collected by the BESIII detector operating at the BEPCII storage ring, the decays χcJJ=012→pp¯ηη are observed for the first time through the radiative transition ψ(3686) → γχcJ. The statistical significances for χcJ signals are all larger than 5σ. The branching fractions of χc0,1,2→pp¯ηη are determined to be (5.75 ± 0.59 ± 0.42) × 10−5, (1.40 ± 0.33 ± 0.17) × 10−5, and (2.64 ± 0.40 ± 0.27) × 10−5, respectively, where the first uncertainties are statistical and the second systematic. No evident resonant structures are found in the pp¯ and pη/p¯η systems.File in questo prodotto:
| File | Dimensione | Formato | |
|---|---|---|---|
|
JHEP10(2025)090.pdf
accesso aperto
Tipologia:
Full text (versione editoriale)
Licenza:
Creative commons
Dimensione
622.68 kB
Formato
Adobe PDF
|
622.68 kB | Adobe PDF | Visualizza/Apri |
I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.


