K. Y. Shan

Observation of $χ_{cJ}(J=0,1,2)\rightarrow p\bar{p}ηη$

BESIII Collaboration, М. Н. Ачасов, P. Adlarson, X. Ai et autres

Using $(2712.4\pm14.3)\times10^6$ $ψ(3686)$ events collected by the BESIII detector operating at the BEPCII storage ring, the decays $χ_{cJ}(J=0,1,2)\rightarrow p\bar{p}ηη$ are observed for the first time through the radiative transition $ψ(3686)\toγχ_{cJ}$. The statistical significances for $χ_{cJ}$ signals are all larger than 5$σ$. The …

Observation of $ψ(3686) \to Ξ^- K^0_S \barΩ^+ $+c.c

BESIII Collaboration, М. Н. Ачасов, P. Adlarson, X. C. Ai et autres

Using a sample of $(2.712\pm0.014) \times 10^{9}$ $ψ(3686)$ events collected with the BESIII detector at the electron positron collider BEPCII, the decay $ψ(3686) \to Ξ^- K^0_S \barΩ^+ +c.c.$ is observed for the first time, which has a significance of 5.9 standard deviations. …

Amplitude analysis of $ψ(3686)\to γK_S^0 K_S^0 $

BESIII Collaboration, M. N. Achasov, P. Adlarson, X. Ai et autres

Using $(2712\pm14)\times10^6$ $ψ(3686)$ events collected with the BESIII detector, we perform the first amplitude analysis of the radiative decay $ψ(3686)\to γK_S^0 K_S^0$ within the mass region $M_{K_S^0 K_S^0 }<2.8$ GeV/$c^2$. Employing a one-channel K-matrix approach for the description of the dynamics of …

Search for the Cabibbo-suppressed decays $Λ_c^{+}\toΣ^0K^{+}π^{0}$ and $Λ_c^{+}\toΣ^0K^{+}π^{+}π^{-}$

BESIII Collaboration, M. Ablikim, М. Н. Ачасов, P. Adlarson et autres

Utilizing 4.5 $fb^-$ of $e^+e^-$ annihilation data collected at center-of-mass energies ranging from 4599.53 MeV to 4698.82 MeV by the BESIII detector at the BEPCII collider, we search for the singly Cabibbo-suppressed hadronic decays $Λ_{c}^{+}\toΣ^{0} K^{+}π^{0}$ and $Λ_{c}^{+}\toΣ^{0}K^{+}π^+π^-$ with a single-tag method. …

Observation of $D\to \bar{K}_{1}(1270)μ^+ν_μ$ and test of lepton flavor universality with $D\to \bar{K}_1(1270) \ell^{+} ν_{\ell}$

BESIII Collaboration, M. Ablikim, М. Н. Ачасов, P. Adlarson et autres

By analyzing 7.93 $\rm fb^{-1}$ of $e^+e^-$ collision data collected at the center-of-mass energy of 3.773 GeV with the BESIII detector operated at the BEPCII collider, we report the observation of the semimuonic decays of $D^+\to \bar K_1(1270)^0μ^+ν_μ$ and $D^0\to K_1(1270)^-μ^+ν_μ$ with …

Observation of $\psi (3686)\to {K}^{-}\Lambda (1520){\overline{\Xi}}^{+}$ + c.c.

M. Ablikim, М. Н. Ачасов, P. Adlarson, O. Afedulidis et autres

Based on $(2712.4 \pm 14.3)\times 10^6$ $ψ(3686)$ events collected at the BESIII detector operating at the BEPCII collider, we present the first observation of the decay $ψ(3686) \to K^{-}Λ(1520)\barΞ^{+} + c.c.$. The product branching fraction ${\cal B}[ψ(3686) \to K^{-}Λ(1520)\barΞ^{+} + c.c.] \times …

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Measurement of Born cross section of $e^+e^-\toΣ^0\barΣ^0$ at $\sqrt{s} = 3.50-4.95$ GeV

BESIII Collaboration, M. Ablikim, М. Н. Ачасов, P. Adlarson et autres

Using $e^+e^-$ collision data collected with the BESIII detector at the BEPCII collider at thirty-two center-of-mass energies from 3.50 to 4.95 GeV, corresponding to an integrated luminosity of 25 $\rm{fb^{-1}}$, we measure the Born cross section of the $e^+e^-\toΣ^0\barΣ^0$ reaction and the …

Study of the decay ψ(3686) \to Σ^{0}\barΣ^{0}ϕ

BESIII Collaboration, M. Ablikim, М. Н. Ачасов, P. Adlarson et autres

Using $(27.12\pm 0.14)\times 10^{8}$ $ψ(3686)$ events collected with the BESIII detector operating at the BEPCII collider, the decay $ψ(3686)\toΣ^{0}\barΣ^{0}ϕ$ is observed for the first time with a statistical significance of 7.6$σ$. Its branching fraction is measured to be $(2.64 \pm 0.32_{\textrm{stat}} \pm …

Search for $Λ$-$\barΛ $ oscillation in $J/ψ\rightarrowΛ\barΛ$ decay

BESIII Collaboration, M. Ablikim, М. Н. Ачасов, P. Adlarson et autres

Using $(10087\pm44)\times 10^{6}$ $J/ψ$ decays collected by the BESIII detector at the BEPCII collider, we search for baryon number violation via $Λ-\barΛ$ oscillation in the decay $J/ψ\to Λ\barΛ$. No evidence for $Λ-\barΛ$ oscillation is observed. The upper limit on the time-integrated probability …

Observation of $χ_{c0}\toΣ^{+}\barΣ^{-}η$ and evidence for $χ_{c1,2}\toΣ^{+}\barΣ^{-}η$

BESIII Collaboration, M. Ablikim, М. Н. Ачасов, P. Adlarson et autres

Using $(27.12\pm 0.14)\times10^{8}$ $ψ(3686)$ events collected with the BESIII detector, the decay $χ_{c0}\toΣ^{+}\barΣ^{-}η$ is observed for the first time with a statistical significance of $7.0σ$, and evidence for $χ_{c1}\toΣ^{+}\barΣ^{-}η$ and $χ_{c2}\toΣ^{+}\barΣ^{-}η$ is found with statistical significances of $4.3σ$ and $4.6σ$, respectively. The …

Measurement of $Σ^+$ transverse polarization in $e^+e^-$ collisions at $\sqrt{s} = 3.68-3.71$ GeV

BESIII Collaboration, М. Н. Ачасов, P. Adlarson, O. Afedulidis et autres

Using $e^+e^-$ collision data collected with the BESIII detector at seven energy points ranging from 3.68 to 3.71 GeV and corresponding to an integrated luminosity of $652.1~{\rm pb^{-1}}$, we present an energy-dependent measurement of the transverse polarization, relative phase and modulus ratio …

Partial wave analysis of $ \psi (3686)\to \Lambda {\overline{\Sigma}}^0{\pi}^0 $ + c.c.

M. Ablikim, М. Н. Ачасов, P. Adlarson, O. Afedulidis et autres

Based on a sample of $(2712.4\pm14.3)\times10^6\;ψ(3686)$ events collected with the BESIII detector, a partial wave analysis of the decay $ψ(3686)\toΛ\barΣ^0π^0+c.c.$ is performed to investigate $Λ^*$ and $Σ^*$ resonances in the $π^0\barΣ^0$ and $π^0Λ$ invariant mass distributions. Significant contributions are found from the …