2012
DOI: 10.1103/physrevd.86.092008
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Precision measurements of branching fractions forψπ0J/ψandηJ/ψ

Abstract: We present a precision study of the ψ ′ → π 0 J/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 ′ → π 0 J/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 ′ →π 0 J/ψ) B(ψ ′ →ηJ/ψ) is determined to be (3.74±0.06 (stat.)±0.04 (… Show more

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Cited by 10 publications
(6 citation statements)
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“…In order to validate the event selection criteria, we calculate the branching fraction Bðψð3686Þ → ηJ=ψÞ and compare it with a previous BESIII measurement [24], where η is reconstructed via two photons and only the first set of the data sample of ð107.0 AE 0.8Þ million ψð3686Þ taken in 2009 [14] was used. In our calculation, the yield of ψð3686Þ → ηJ=ψ; η → π 0 π þ π − is obtained by counting events in the η signal region and subtracting the events in the η sideband region.…”
Section: Methodology and Event Selectionmentioning
confidence: 99%
“…In order to validate the event selection criteria, we calculate the branching fraction Bðψð3686Þ → ηJ=ψÞ and compare it with a previous BESIII measurement [24], where η is reconstructed via two photons and only the first set of the data sample of ð107.0 AE 0.8Þ million ψð3686Þ taken in 2009 [14] was used. In our calculation, the yield of ψð3686Þ → ηJ=ψ; η → π 0 π þ π − is obtained by counting events in the η signal region and subtracting the events in the η sideband region.…”
Section: Methodology and Event Selectionmentioning
confidence: 99%
“…Thereby, the decay amplitudes reflect the flavor symmetry breaking, and it is the mass differences within the multiplet that generates the isospin or the SU(3) breaking [26]. The ratio R π 0 /η was found to be (3.74 ± 0.06 ± 0.04)% by BESIII, with unprecedented high precision [27]. Another isospin-violating transition ψ ′ → π 0 h c was observed to be B(ψ ′ → π 0 h c ) = (8.4 ± 1.3 ± 1.0) × 10 −4 by the BESIII Collaboration [28].…”
Section: Isospin Violating Hadronic Transitions In the Charmonium Systemmentioning
confidence: 99%
“…The maximum value of χ 2 4C is determined by optimizing the statistical significance S/ √ S + B in the η c signal region, where S (B) is the number of signal (background) events obtained from the signal (inclusive) MC samples. For the estimate of S, the branching fractions of χ c0,2 → π 0 η c are assumed to be 10 −3 in analogy with the isospin-violating process ψ(3686) → π 0 J/ψ [1]. The signal region is defined as 2.90 < M K 0 S K ± π ∓ /(GeV/c 2 ) < 3.05.…”
Section: A Event Selectionmentioning
confidence: 99%
“…± 0.03(syst.)) × 10 −3 [1], whereas for other hadronic transitions such as ψ(3686) → π + π − J/ψ, the branching fraction is (34.45 ± 0.30) × 10 −2 [2] and thus significantly stronger.…”
Section: Introductionmentioning
confidence: 96%
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