We present a precision study of the ψ′→π0J/ψ and ηJ/ψ decay modes. The measurements are obtained using 106×10^6 ψ′ events accumulated with the BESIII detector at the BEPCII e+e- collider operating at a center-of-mass energy corresponding to the ψ′ mass. We obtain B(ψ′→π0J/ψ)=(1.26±0.02(stat)±0.03(syst))×10^-3 and B(ψ′→ηJ/ψ)=(33.75±0.17(stat)±0.86(syst))×10^-3. The branching fraction ratio R=B(ψ′→π0J/ψ)/B(ψ′→ηJ/ψ) is determined to be (3.74±0.06(stat)±0.04(syst))×10^-2. The precision of these measurements of B(ψ′→π0J/ψ) and R represent a significant improvement over previously published values.

Precision measurements of branching fractions for ψ^{′}→π^{0}J/ψ and ηJ/ψ

DESTEFANIS, MARCO GIOVANNI;FAVA, Luciano;GRECO, Michela;MAGGIORA, MARCO;SPATARO, STEFANO GIOVANNI;
2012-01-01

Abstract

We present a precision study of the ψ′→π0J/ψ and ηJ/ψ decay modes. The measurements are obtained using 106×10^6 ψ′ events accumulated with the BESIII detector at the BEPCII e+e- collider operating at a center-of-mass energy corresponding to the ψ′ mass. We obtain B(ψ′→π0J/ψ)=(1.26±0.02(stat)±0.03(syst))×10^-3 and B(ψ′→ηJ/ψ)=(33.75±0.17(stat)±0.86(syst))×10^-3. The branching fraction ratio R=B(ψ′→π0J/ψ)/B(ψ′→ηJ/ψ) is determined to be (3.74±0.06(stat)±0.04(syst))×10^-2. The precision of these measurements of B(ψ′→π0J/ψ) and R represent a significant improvement over previously published values.
2012
86
092008-1
092008-8
http://prd.aps.org/abstract/PRD/v86/i9/e092008
BESIII detector; J/ψ decays
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