Measurement of branching ratios for ηc hadronic decays

“…The contribution to J/Ψ→γpp up to invariant pp masses of M (pp)≈ 2 GeV is roughly 5 times larger than the rate for the reaction J/Ψ→γη c followed by the η c →pp decay. Taking into account that the latter rate was recently published [46] as BR=1.9·10 −5 we can estimate that…”

Section: Discussionmentioning

confidence: 83%

Near threshold enhancement of thepp¯mass spectrum inJ/Ψdecay

et al. 2005

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We investigate the nature of the near-threshold enhancement in the pp invariant mass spectrum of the reaction J/Ψ→γpp reported recently by the BES Collaboration. Using the Jülich NN model we show that the mass dependence of the pp spectrum close to the threshold can be reproduced by the S-wave pp final state interaction in the isospin I=1 state within the Watson-Migdal approach. However, because of our poor knowledge of the NN interaction near threshold and of the J/Ψ→γpp reaction mechanism and in view of the controversal situation in the decay J/Ψ→π 0 pp, where no obvious signs of a pp final state interaction are seen, explanations other than final state interactions cannot be ruled out at the present stage.

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“…The η c decays into vector meson pairs is highly suppressed at leading order in QCD due to the HSR, and it is observed by MARKIII [22] with a product branching fraction with J/ψ → γη c of (1.02 ± 0.25 ± 0.14) × 10 −4 , and the result is confirmed by BES [23] and BESIII [24] experiments. However, the measured branching fraction is much larger than the theoretical calculations in different scenario [25].…”

Section: Improved Measurements Ofmentioning

confidence: 81%

Charmonium decays at BESIII

Zheng¹

2018

Proceedings of XVII International Conference on Hadron Spectroscopy and Structure — PoS(Hadron2017)

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The BESIII Experiment at the Beijing Electron Positron Collider (BEPCII) has accumulated the largest e + e − collisions data sets in the τ-charm region in the world. Using the data sets of 448.1 million ψ(3686) events and 1.3 billion J/ψ events, the branching fractions and the angular distributions of J/ψ and ψ(3686) decay to ΛΛ, Σ 0Σ0 , Σ (1385) XVII International Conference on Hadron Spectroscopy and Structure -Hadron2017

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Measurement of branching ratios for ηc hadronic decays

Cited by 15 publications

References 13 publications

Branching fraction measurements ofB→ηcKdecays

Branching fraction measurements ofB→ηcKdecays

Near threshold enhancement of thepp¯mass spectrum inJ/Ψdecay

Charmonium decays at BESIII

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