Based on a sample of 2.25x10^8 J/Psi events taken with the BESIII detector at the BEPCII collider, we present the results of a study of the decay J/Psi-->eta phi pi+pi-. The Y(2175) resonance is observed in the invariant mass spectrum of phi f0(980) with a statistical significance of greater than 10sigma. The corresponding mass and width are determined to be M=2200±6(stat)±5(syst) MeV/c2 and Gamma=104±15(stat)±15(syst) MeV, respectively, and the product branching fraction is measured to be B(J/Psi-->eta Y(2175),Y(2175)-->’phi f0(980),f0(980)-->’pi+pi-)=(1.20±0.14(stat)±0.37(cyst))x10-4. The results are consistent within errors with those of previous experiments. We also measure the branching fraction of J/Psi --> ’phi f1(1285) with f1(1285)-->’eta pi+pi- and set upper limits on the branching fractions for J/Psi -->phi eta(1405) / phi X(1835) / phi X(1870) with eta(1405)/X(1835)/X(1870)--> eta pi+pi- at the 90% confidence level.

Study of J /Psi --> eta phi pi+pi- at BESIII

Garzia, I.;
2015

Abstract

Based on a sample of 2.25x10^8 J/Psi events taken with the BESIII detector at the BEPCII collider, we present the results of a study of the decay J/Psi-->eta phi pi+pi-. The Y(2175) resonance is observed in the invariant mass spectrum of phi f0(980) with a statistical significance of greater than 10sigma. The corresponding mass and width are determined to be M=2200±6(stat)±5(syst) MeV/c2 and Gamma=104±15(stat)±15(syst) MeV, respectively, and the product branching fraction is measured to be B(J/Psi-->eta Y(2175),Y(2175)-->’phi f0(980),f0(980)-->’pi+pi-)=(1.20±0.14(stat)±0.37(cyst))x10-4. The results are consistent within errors with those of previous experiments. We also measure the branching fraction of J/Psi --> ’phi f1(1285) with f1(1285)-->’eta pi+pi- and set upper limits on the branching fractions for J/Psi -->phi eta(1405) / phi X(1835) / phi X(1870) with eta(1405)/X(1835)/X(1870)--> eta pi+pi- at the 90% confidence level.
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/11392/2378081
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