Based on a sample of 1.31x10^9 Jpsi events collected with the BESIII detector at the BEPCII collider, Dalitz plot analyses of selected 79,625 eta-->pi+pi-pi0 events, 33,908 eta-->pi0pi0pi0 events, and 1,888 eta'-->pi0pi0pi0 events are performed. The measured matrix elements of eta-->pi+pi-pi0 are in reasonable agreement with previous measurements. The Dalitz plot slope parameters of eta-->pi0pi0pi0 and eta'-->pi0pi0pi0 are determined to be -0.055±0.014±0.004 and -0.640±0.046±0.047, respectively, where the first uncertainties are statistical and the second systematic. Both values are consistent with previous measurements, while the precision of the latter one is improved by a factor of 3. Final state interactions are found to have an important role in those decays.
Measurement of the matrix elements for the decays eta -->i+pi-pi0 and eta/eta'-->pi0pi0pi0
Garzia, I.;
2015
Abstract
Based on a sample of 1.31x10^9 Jpsi events collected with the BESIII detector at the BEPCII collider, Dalitz plot analyses of selected 79,625 eta-->pi+pi-pi0 events, 33,908 eta-->pi0pi0pi0 events, and 1,888 eta'-->pi0pi0pi0 events are performed. The measured matrix elements of eta-->pi+pi-pi0 are in reasonable agreement with previous measurements. The Dalitz plot slope parameters of eta-->pi0pi0pi0 and eta'-->pi0pi0pi0 are determined to be -0.055±0.014±0.004 and -0.640±0.046±0.047, respectively, where the first uncertainties are statistical and the second systematic. Both values are consistent with previous measurements, while the precision of the latter one is improved by a factor of 3. Final state interactions are found to have an important role in those decays.File | Dimensione | Formato | |
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PhysRevD.92.012014.pdf
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