Measurement of the absolute branching fractions of Jpsi to gamma eta and eta decay modes

BESIII Collaboration

Measurement of the absolute branching fractions of Jpsi to gamma eta and eta decay modes

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arxiv 2109.12812 v1 pith:M75Y23CB submitted 2021-09-27 hep-ex

BESIII Collaboration This is my paper · ORCID

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keywords gammaabsoluteeta-decayjpsi-measuredbranchingevents

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Based on a data sample of (1.0087+-0.0044)x10^10 Jpsi events collected by the BESIII detector at the BEPCII accelerator, the absolute branching fraction (BF) of the decay Jpsi->gamma eta is measured with high precision using events in which the radiative photon converts to e+e-. Using the measured absolute BF of Jpsi->gamma eta, the absolute BFs of four dominant eta decay modes are measured for the first time. The results are B(Jpsi->gamma eta) = (1.067+-0.005+-0.023)x10^-3, B(eta->gamma gamma) = (39.86+-0.04+-0.99)%, B(eta->pi0pi0pi0) = (31.96+-0.07+-0.84)%, B(eta->pi+pi-pi0) = (23.04+-0.03+-0.54)%, and B(eta->pi+pi-gamma) = (4.38+-0.02+-0.10)%, where the first and second uncertainties are statistical and systematic, respectively. The results are consistent with the world average values within two standard deviations.

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With vector-meson effects included, the WZW anomalous coupling extracted from eta-prime to pi+ pi- gamma matches theory and implies a box-anomaly branching fraction about an order of magnitude larger than the published value.

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