L. Yan

collaborators

3 papers

hep-ex2025

Precision measurement of the branching fraction for the decay $ψ (2 S) \to τ^{+} τ^{-}$

BESIII Collaboration, M. Ablikim, M. N. Achasov +684

Using $(2259.3 \pm 11.1) \times 1 0^{6}$ $ψ (2 S)$ events acquired with the BESIII detector, the branching fraction of $ψ (2 S) \to τ^{+} τ^{-}$ is measured with improved precision t…

hep-ex2022

Measurement of the $e^{+} e^{-} \to π^{+} π^{-} J / ψ$ cross section in the vicinity of 3.872 GeV

BESIII Collaboration, M. Ablikim, M. N. Achasov +566

We report a measurement of the cross section for the process $e^{+} e^{-} \to π^{+} π^{-} J / ψ$ around the $X (3872)$ mass in search for the direct formation of $e^{+} e^{-} \to X (3872)$ through the tw…

hep-ex2022

Measurement of the total and leptonic decay widths of the $J / ψ$ resonance with an energy scan method at BESIII

BESIII Collaboration, M. Ablikim, M. N. Achasov +566

Using $e^{+} e^{-}$ annihilation data sets collected with the BESIII detector, we measure the cross sections of the processes $e^{+} e^{-} \to e^{+} e^{-}$ and $e^{+} e^{-} \to μ^{+} μ^{-}$ at fifteen cent…

Precision measurement of the branching fraction for the decay ψ(2S)→τ+τ−

Measurement of the e+e−→π+π−J/ψ cross section in the vicinity of 3.872 GeV

Measurement of the total and leptonic decay widths of the J/ψ resonance with an energy scan method at BESIII

Precision measurement of the branching fraction for the decay $ψ (2 S) \to τ^{+} τ^{-}$

Measurement of the $e^{+} e^{-} \to π^{+} π^{-} J / ψ$ cross section in the vicinity of 3.872 GeV

Measurement of the total and leptonic decay widths of the $J / ψ$ resonance with an energy scan method at BESIII