Abstract
With the data samples taken at center-of-mass energies from 2.00 to 3.08 GeV with the BESIII detector at the BEPCII collider, a partial wave analysis on the π+β’πββπ+β’πββ’π0 process is performed. The Born cross sections for π+β’πββπ+β’πββ’π0 and its intermediate processes π+β’πββπβ’π and πβ‘(1450)β’π are measured as functions of βπ . The results for π+β’πββπ+β’πββ’π0 are consistent with previous results measured with the initial state radiation method within one standard deviation, and improve the uncertainty by a factor of ten. By fitting the line shapes of the Born cross sections for the π+β’πββπβ’π and π+β’πββπβ‘(1450)β’π, a structure with mass π=2119Β±11Β±15ββMeV/π2 and width Ξ=69Β±30Β±5ββMeV is observed with a significance of 5.9β’π, where the first uncertainties are statistical and the second ones are systematic. This structure can be interpreted as an excited π state.
| Original language | English |
|---|---|
| Article number | 032005 |
| Number of pages | 13 |
| Journal | Physical Review D |
| Volume | 110 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - 1-Aug-2024 |