Based on 106 x 10^6 psi(3686) events collected with the BESIII detector at the BEPCII facility, a partial wave analysis of psi(3686) -> p pbar pi0 is performed. The branching fraction of this channel has been determined to be B(psi(3686) -> p pbar pi0) = (1:65 +- 0:03 +- 0:15) x 10^-4. In this decay, 7 N* intermediate resonances are observed. Among these, two new resonances, N(2300) and N(2570) are significant, one 1/2+ resonance with a mass of 2300^+40+109_-30-0 MeV/c^2 and width of 340^+30+110_-30-58 MeV/c^2, and one 5/2- resonance with a mass of 2570^+19+34_-10-10 MeV/c^2 and width of 250^+14+69_-24-21 MeV/c^2. For the remaining 5 N* intermediate resonances [N(1440), N(1520), N(1535), N(1650) and N(1720)], the analysis yields mass and width values that are consistent with those from established resonances.
Observation of Two New N* Resonances in the Decay \psi(3686) \ar ppbarpi0
DESTEFANIS, MARCO GIOVANNI;GRECO, Michela;MAGGIORA, MARCO;SPATARO, STEFANO GIOVANNI;
2013-01-01
Abstract
Based on 106 x 10^6 psi(3686) events collected with the BESIII detector at the BEPCII facility, a partial wave analysis of psi(3686) -> p pbar pi0 is performed. The branching fraction of this channel has been determined to be B(psi(3686) -> p pbar pi0) = (1:65 +- 0:03 +- 0:15) x 10^-4. In this decay, 7 N* intermediate resonances are observed. Among these, two new resonances, N(2300) and N(2570) are significant, one 1/2+ resonance with a mass of 2300^+40+109_-30-0 MeV/c^2 and width of 340^+30+110_-30-58 MeV/c^2, and one 5/2- resonance with a mass of 2570^+19+34_-10-10 MeV/c^2 and width of 250^+14+69_-24-21 MeV/c^2. For the remaining 5 N* intermediate resonances [N(1440), N(1520), N(1535), N(1650) and N(1720)], the analysis yields mass and width values that are consistent with those from established resonances.File | Dimensione | Formato | |
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