Y. F. Liang

Study of the reactions $\bar{n} p \to 2π^{+}π^{-}$, $2π^{+}π^{-}π^{0}$, and $2π^{+}π^{-}2π^{0}$ using $J/ψ\to p π^{-}\bar{n}$

BESIII Collaboration, M. Ablikim, Mikhail N. Achasov, P. Adlarson et autres

We report an experimental investigation of the reactions $\bar{n} p \to 2π^{+}π^{-}$, $\bar{n} p \to 2π^{+}π^{-}π^{0}$, and $\bar{n} p \to 2π^{+}π^{-}2π^{0}$ using $(10.087 \pm 0.044) \times 10^{9}$ $J/ψ$ events collected with the BESIII detector at the BEPCII storage ring. The antineutron ($\bar{n}$) …

Unraveling the Structure of Λ Hyperons with Polarized Λ Λ ¯ Pairs

M. Ablikim, M. N. Achasov, P. Adlarson, X. C. Ai et autres

With data collected in a dedicated energy scan from 2.3864 up to 3.0800 GeV, the BESIII Collaboration provides the first complete energy-dependent measurements of the Λ electromagnetic form factors in the timelike region. By combining double-tag and single-tag events from the e^{+}e^{-}→ΛΛ[over …

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Test of local realism via entangled $$\Lambda \bar{\Lambda }$$ system

M. Ablikim, M. N. Achasov, P. Adlarson, X. C. Ai et autres

The non-locality of quantum correlations is a fundamental feature of quantum theory. The Bell inequality serves as a benchmark for distinguishing between predictions made by quantum theory and local hidden variable theory (LHVT). Recent advancements in photon-entanglement experiments have addressed potential loopholes …

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R ( 3780 ) Resonance Interpreted as the 1 D 1 3 -Wave Dominant State of Charmonium from Precise Measurements of the Cross Section of e + e − → Hadrons

M. Ablikim, M. N. Achasov, P. Adlarson, X. C. Ai et autres

We report the precise measurements of the cross section of e^{+}e^{-}→hadrons at center-of-mass energies from 3.645 to 3.871 GeV. We thereby perform the most precise study of the cross sections and find a complex system composed of three resonances of R(3760), R(3780), …

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Measurements of the branching fractions of the P -wave charmonium spin-singlet state h c ( P 1 1 ) → h + h − π 0 / η

M. Ablikim, M. N. Achasov, P. Adlarson, O. Afedulidis et autres

Based on ( 2712.4 ± 14.3 ) × 10 6 ψ ( 3686 ) events, we investigate four hadronic decay modes of the P -wave charmonium spin-singlet state h c ( 1 P 1 ) → h + h − π 0 …

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Observation of Structures in the Processes e+e−→ωχc1 and ωχc2

M. N. Achasov, P. Adlarson, X. C. Ai, R. Aliberti et autres

We present measurements of the Born cross sections for the processes e^{+}e^{-}→ωχ_{c1} and ωχ_{c2} at center-of-mass energies sqrt[s] from 4.308 to 4.951 GeV. The measurements are performed with data samples corresponding to an integrated luminosity of 11.0 fb^{-1} collected with the BESIII …

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Observation of the Anomalous Shape of X(1840) in J/ψ→γ3(π+π−) Indicating a Second Resonance Near pp¯ Threshold

M. N. Achasov, P. Adlarson, X. C. Ai, R. Aliberti et autres

Using a sample of (10087±44)×10^{6} J/ψ events, which is about 45 times larger than that was previously analyzed, a further investigation on the J/ψ→γ3(π^{+}π^{-}) decay is performed. A significant distortion at 1.84 GeV/c^{2} in the line shape of the 3(π^{+}π^{-}) invariant mass …

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First measurement of $ΛN$ inelastic scattering with $Λ$ from $e^{+} e^{-} \rightarrow J/ψ\to Λ\barΛ$

BESIII Collaboration, Mikhail N. Achasov, P. Adlarson, O. Afedulidis et autres

Using an $e^+ e^-$ collision data sample of $(10087 \pm 44)\times10^6 ~J/ψ$ events taken at the center-of-mass energy of $3.097~\rm{GeV}$ by the BESIII detector at the BEPCII collider, the process $Λ+N \rightarrow Σ^+ + X$ is studied for the first time employing …

Study of the Semileptonic Decay $Λ_c^+\rightarrow Λe^+ν_e$

BESIII Collaboration, M. Ablikim, Mikhail N. Achasov, P. Adlarson et autres

The measurement of the Cabibbo-favored semileptonic decay $Λ_c^+\rightarrow Λe^+ν_e$ is reported using a $4.5~\mathrm{fb}^{-1}$ data sample of $e^+e^-$ annihilations collected at center-of-mass energies ranging from 4.600~GeV to 4.699~GeV with the BESIII detector at the BEPCII collider. The branching fraction of the decay …

Measurement of the branching fraction and decay asymmetry of $Λ\to nγ$

BESIII Collaboration, M. Ablikim, M. N. Achasov, P. Adlarson et autres

The radiative hyperon decay $Λ\to nγ$ is studied using $(10087\pm44)\times 10^6$ $J/ψ$ events collected with the BESIII detector operating at BEPCII. The absolute branching fraction of the decay $Λ\to nγ$ is determined with a significance of 5.6$σ$ to be $[0.832\pm0.038(\rm stat.)\pm0.054(\rm syst.)]\times10^{-3}$, …

Study of e+e−→π+π−π0ηc and evidence for Zc(3900)± decaying into ρ±ηc

Mikhail N. Achasov, S. Ahmed, M. Albrecht, M. Alekseev et autres

We study the reaction ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{0}{\ensuremath{\eta}}_{c}$ for the first time using data samples collected with the BESIII detector at center-of-mass energies $\sqrt{s}=4.226$, 4.258, 4.358, 4.416, and 4.600 GeV. Evidence of this process is found and the Born cross section ${\ensuremath{\sigma}}^{B}({e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{0}{\ensuremath{\eta}}_{c})$, excluding ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}\ensuremath{\omega}{\ensuremath{\eta}}_{c}$ and …

Measurement of χcJ decaying into η′K+K−

M. N. Achasov, X. Ai, O. Albayrak, M. Albrecht et autres

Using $(106.41\ifmmode\pm\else\textpm\fi{}0.86)\ifmmode\times\else\texttimes\fi{}1{0}^{6}\text{ }\ensuremath{\psi}(3686)$ events collected with the BESIII detector at BEPCII, we study for the first time the decay ${\ensuremath{\chi}}_{cJ}\ensuremath{\rightarrow}{\ensuremath{\eta}}^{\ensuremath{'}}{K}^{+}{K}^{\ensuremath{-}}$ ($J=1$, 2), where ${\ensuremath{\eta}}^{\ensuremath{'}}\ensuremath{\rightarrow}\ensuremath{\gamma}{\ensuremath{\rho}}^{0}$ and ${\ensuremath{\eta}}^{\ensuremath{'}}\ensuremath{\rightarrow}\ensuremath{\eta}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$. A partial wave analysis in the covariant tensor amplitude formalism is performed for the decay ${\ensuremath{\chi}}_{c1}\ensuremath{\rightarrow}{\ensuremath{\eta}}^{\ensuremath{'}}{K}^{+}{K}^{\ensuremath{-}}$. …

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