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.
2015
Ablikim, M.; Achasov, M. N.; Ai, X. C.; Albayrak, O.; Albrecht, M.; Ambrose, D. J.; Amoroso, A.; An, F. F.; An, Q.; Bai, J. Z.; Baldini Ferroli, R.; B...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11392/2378107
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