By analyzing a ψ(3686) data sample containing (107.7±0.6)×106 events taken with the BESIII detect- or at the BEPCII storage ring in 2009, the χc0 resonance parameters are precisely measured using χc0,c2 → π+π−/K+K− events. The mass of χc0 is determined to be M(χc0) = (3415.63±0.07±0.07±0.07) MeV/c2, and its full width is Γ(χc0) = (12.52±0.12±0.13) MeV, where the first uncertainty is statistical, the second systematic, and the third for mass comes from χc2 mass uncertainty. These measurements improve the precision of χc0 mass by a factor of four and width by one order of magnitude over the previous individual measurements, and significantly boost our knowledge about the charmonium spectrum. Together with additional (345.4±2.6)×106 ψ(3686) data events taken in 2012, the decay branching fractions of χc0,c2 → π+π−/K+K− are measured as well, with precision improved by a factor of three compared to previous measurements. These χc0 decay branching fractions provide important inputs for the study of glueballs.
Precise measurement of the χc0 resonance parameters and branching fractions of χc0,c2 → π+π−/K+K−
Garzia I.;
2025
Abstract
By analyzing a ψ(3686) data sample containing (107.7±0.6)×106 events taken with the BESIII detect- or at the BEPCII storage ring in 2009, the χc0 resonance parameters are precisely measured using χc0,c2 → π+π−/K+K− events. The mass of χc0 is determined to be M(χc0) = (3415.63±0.07±0.07±0.07) MeV/c2, and its full width is Γ(χc0) = (12.52±0.12±0.13) MeV, where the first uncertainty is statistical, the second systematic, and the third for mass comes from χc2 mass uncertainty. These measurements improve the precision of χc0 mass by a factor of four and width by one order of magnitude over the previous individual measurements, and significantly boost our knowledge about the charmonium spectrum. Together with additional (345.4±2.6)×106 ψ(3686) data events taken in 2012, the decay branching fractions of χc0,c2 → π+π−/K+K− are measured as well, with precision improved by a factor of three compared to previous measurements. These χc0 decay branching fractions provide important inputs for the study of glueballs.| File | Dimensione | Formato | |
|---|---|---|---|
|
Ablikim_2025_Chinese_Phys._C_49_091001.pdf
accesso aperto
Descrizione: Full text editoriale
Tipologia:
Full text (versione editoriale)
Licenza:
Creative commons
Dimensione
1.02 MB
Formato
Adobe PDF
|
1.02 MB | Adobe PDF | Visualizza/Apri |
I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.


