Precision measurements of branching fractions for ${\psi }^{\prime }\to {\pi }^{0}J\psi$ and $\eta J\psi$

Abstract

We present a precision study of the $\psip\toπ^0 J/ψ$ and $\eta J/\psi$ decay modes. The measurements are obtained using $106\times 10^6$ ${\psi }^{\prime }$ events accumulated with the BESIII detector at the BEPCII $\ee$ collider operating at a center-of-mass energy corresponding to the $\psip$ mass. We obtain $\mathcal{B}(\psip\toπ^0 J/ψ)=(1.26\pm0.02{\rm (stat.)}\pm0.03{\rm (syst.)})\times 10^{-3}$ and $\mathcal{B}(\psip\toηJ/ψ)=(33.75\pm0.17{\rm (stat.)}\pm0.86{\rm (syst.)})\times 10^{-3}$. The branching fraction ratio $R=\frac{\mathcal{B}(\psip\toπ^0 J/ψ)}{\mathcal{B}(\psip\toηJ/ψ)}$ is determined to be $(3.74\pm 0.06(stat.)\pm 0.04(syst.))\times 10^{-2}$. The precision of these measurements of $\mathcal{B}(\psip\toπ^{0} J/ψ)$ and $R$ represent a significant improvement over previously published values.

four figures, 12 pages

References in corpus (7)

• Study of ${\chi }_{cJ}$ radiative decays into a vector meson
• Effect of charmed meson loops on charmonium transitions
• Towards a dynamical understanding of the non-$D\bar{D}$ decay of $\psi (3770)$
• Trigger efficiencies at BES III
• Observation of ${\chi }_{c1}$ decays into vector meson pairs $\varphi \varphi$, $\omega \omega$, and $\omega \varphi$
• Evidence for the Direct Two-Photon Transition from $\psi (3686)$ to $J/\psi$
• Isospin violating decay of $\psi (3770)\to J/\psi +{\pi }^0$

Cited by in corpus (6)

• Exotics: Heavy Pentaquarks and Tetraquarks
• Observation of Electromagnetic Dalitz decays J/ψ\to P e^+e^-
• Measurement of higher-order multipole amplitudes in $\psi (3686)\to \gamma {\chi }_{c1,2}$ with ${\chi }_{c1,2}\to \gamma J/\psi$ and search for the transition ${\eta }_c(2S)\to \gamma J/\psi$
• Branching fraction measurements of $\psi (3686)\to \gamma {\chi }_{cJ}$
• Searches for isospin-violating transitions ${\chi }_{c0,2}\to {\pi }^0{\eta }_c$
• Search for the decay $B_s^0\to J/\psi {\pi }^0$ at Belle experiment