Precision measurement of the branching fractions of ${\eta }^{\prime }$ decays

Abstract

Based on a sample of $(1310.6\pm 7.0)\times 10^{6}J/\psi$ events collected with the BESIII detector, we present measurements of $J/\psi$ and ${\eta }^{\prime }$ absolute branching fractions using the process $J/\psi \to \gamma {\eta }^{\prime }$. By analyzing events where the radiative photon converts into an $e^{+}{e}^{-}$ pair, the branching fraction for $J/\psi \to \gamma {\eta }^{\prime }$ is measured to be $(5.27\pm 0.03\pm 0.05)\times 10^{-3}$. The absolute branching fractions of the five dominant decay channels of the ${\eta }^{\prime }$ are then measured independently for the first time and are determined to be $\mathcal{B}({\eta }^{\prime }\to \gamma {\pi }^{+}{\pi }^{-})$ = (29.90$\pm$0.03$\pm$0.55)%, $\mathcal{B}({\eta }^{\prime }\to \eta {\pi }^{+}{\pi }^{-})$ = (41.24$\pm$0.08$\pm$1.24)%, $\mathcal{B}({\eta }^{\prime }\to \eta {\pi }^0{\pi }^0)$ = (21.36$\pm$0.10$\pm$0.92)%, $\mathcal{B}({\eta }^{\prime }\to \gamma \omega )$ = (2.489$\pm$0.018$\pm$0.074)%, and $\mathcal{B}({\eta }^{\prime }\to \gamma \gamma )$ = (2.331$\pm$0.012$\pm$0.035)%, where the first uncertainties are statistical and the second systematic.

7 pages, 1 figures

References in corpus (5)

• Study of ${\eta }^{\prime }\to \eta {\pi }^{+}{\pi }^{-}$ Dalitz plot
• Observation of ${\eta }^{\prime }\to {\pi }^{+}{\pi }^{-}{\pi }^{+}{\pi }^{-}$ and ${\eta }^{\prime }\to {\pi }^{+}{\pi }^{-}{\pi }^0{\pi }^0$
• Measurement of the matrix elements for the decays ${\eta }^{\prime }\to \eta {\pi }^{+}{\pi }^{-}$ and ${\eta }^{\prime }\to \eta {\pi }^0{\pi }^0$
• Observation of $J/\psi \to \gamma \eta {\pi }^0$
• Search for $\psi (3686)\to \gamma {\eta }_c(\eta (1405))\to \gamma {\pi }^{+}{\pi }^{-}{\pi }^0$

Cited by in corpus (6)

• Neutron Stars with Baryon Number Violation, Probing Dark Sectors
• Neutron star structure with a new force between quarks
• Measurement of the absolute branching fractions of Jpsi to gamma eta and eta decay modes
• Measurement of the Branching Fraction of and Search for a CP-Violating Asymmetry in ${\eta }^{\prime }\to {\pi }^{+}{\pi }^{-}{e}^{+}{e}^{-}$ at BESIII
• Account for axial vector mesons in the $\eta \to {\pi }^{+}{\pi }^{-}\gamma$ and ${\eta }^{\prime }\to {\pi }^{+}{\pi }^{-}\gamma$ decays
• Amplitude Analysis of the Isospin-Violating Decay $J/\psi \to \gamma \eta {\pi }^0$