We study the direct production of the $J^{PC}=1^{++}$ charmonium state $\chi_{c1}(1P)$ in electron-positron annihilation by carrying out an energy scan around the mass of the $\chi_{c1}(1P)$. The data were collected with the BESIII detector at the BEPCII collider. An interference pattern between the signal process $e^+e^-\to \chi_{c1}(1P) \to \gamma J/\psi\to\gamma\mu^+\mu^-$ and the background processes $e^+e^-\to \gamma_{\mathrm{ISR}} J/\psi\to\gamma_{\rm{ISR}}\mu^+\mu^-$ and $e^+e^-\to\gamma_{\rm{ISR}}\mu^+\mu^-$ are observed by combining all the data samples. The $\chi_{c1}(1P)$ signal is observed with a significance of 5.1$\sigma$. This is the first observation of a $C$-even state directly produced in $e^+e^-$ annihilation. The electro...
The first direct measurement of the absolute branching fraction of $\Sigma^+ \to \Lambda e^+ \nu_{e}...
With data samples collected with the BESIII detector at seven energy points at $\sqrt{s}= 3.68 - 3.7...
Using a sample of $(448.1~\pm~2.9)$ $\times 10^{6}$ $\psi(3686)$ decays collected with the BESIII de...
By analyzing $(448.1\pm2.9)\times10^6$ $\psi(3686)$ events collected with the BESIII detector operat...
Using a data sample of $4.481\times 10^8$ $\psi(3686)$ events collected with the BESIII detector, we...
Using data samples with a total integrated luminosity of approximately 18 fb$^{-1}$ collected by the...
The cross sections of the $e^{+}e^{-}\to\phi\eta'$ process at center-of-mass energies from 3.508 to ...
By analyzing $e^+e^-$ annihilation data corresponding to an integrated luminosity of $2.93\,\rm fb^{...
The cross sections of $e^+e^- \rightarrow K^+K^-J/\psi$ at center-of-mass energies from 4.127 to 4.6...
The Born cross sections of the $e^+e^-\to D^{*+}D^{*-}$ and $e^+e^-\to D^{*+}D^{-}$ processes are me...
The $\Xi^0$ asymmetry parameters are measured using entangled quantum $\Xi^0$-$\bar{\Xi}^0$ pairs fr...
The singly Cabibbo-suppressed decay $\Lambda_{c}^{+}\to \Sigma^{-}K^{+}\pi^{+}$ is observed for the ...
The $J/\psi \to \Xi^0 \bar{\Xi}^{0}$ process and subsequent decays are investigated using $(10087 \p...
A light scalar $X_{0}$ or vector $X_{1}$ particles have been introduced as a possible explanation fo...
The decays $J/\psi\to\eta\Sigma^{+}\bar{\Sigma}{}^-$ and $\psi(3686)\to\eta\Sigma^{+}\bar{\Sigma}{}^...
The first direct measurement of the absolute branching fraction of $\Sigma^+ \to \Lambda e^+ \nu_{e}...
With data samples collected with the BESIII detector at seven energy points at $\sqrt{s}= 3.68 - 3.7...
Using a sample of $(448.1~\pm~2.9)$ $\times 10^{6}$ $\psi(3686)$ decays collected with the BESIII de...
By analyzing $(448.1\pm2.9)\times10^6$ $\psi(3686)$ events collected with the BESIII detector operat...
Using a data sample of $4.481\times 10^8$ $\psi(3686)$ events collected with the BESIII detector, we...
Using data samples with a total integrated luminosity of approximately 18 fb$^{-1}$ collected by the...
The cross sections of the $e^{+}e^{-}\to\phi\eta'$ process at center-of-mass energies from 3.508 to ...
By analyzing $e^+e^-$ annihilation data corresponding to an integrated luminosity of $2.93\,\rm fb^{...
The cross sections of $e^+e^- \rightarrow K^+K^-J/\psi$ at center-of-mass energies from 4.127 to 4.6...
The Born cross sections of the $e^+e^-\to D^{*+}D^{*-}$ and $e^+e^-\to D^{*+}D^{-}$ processes are me...
The $\Xi^0$ asymmetry parameters are measured using entangled quantum $\Xi^0$-$\bar{\Xi}^0$ pairs fr...
The singly Cabibbo-suppressed decay $\Lambda_{c}^{+}\to \Sigma^{-}K^{+}\pi^{+}$ is observed for the ...
The $J/\psi \to \Xi^0 \bar{\Xi}^{0}$ process and subsequent decays are investigated using $(10087 \p...
A light scalar $X_{0}$ or vector $X_{1}$ particles have been introduced as a possible explanation fo...
The decays $J/\psi\to\eta\Sigma^{+}\bar{\Sigma}{}^-$ and $\psi(3686)\to\eta\Sigma^{+}\bar{\Sigma}{}^...
The first direct measurement of the absolute branching fraction of $\Sigma^+ \to \Lambda e^+ \nu_{e}...
With data samples collected with the BESIII detector at seven energy points at $\sqrt{s}= 3.68 - 3.7...
Using a sample of $(448.1~\pm~2.9)$ $\times 10^{6}$ $\psi(3686)$ decays collected with the BESIII de...