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22–26 Sep 2025
Asia/Shanghai timezone

The Production and Decay Dynamics of the Charmed Baryon $\Lambda_c^+$ in $e^+e^−$ Annihilations near Threshold

Not scheduled
20m
Oral Fundamental symmetries and spin physics beyond the standard model

Speaker

Dr Hao Sun (UCAS)

Description

The study of the charmed baryons is crucial for investigating the strong and weak interactions in the Standard Model and for gaining insights into the internal structure of baryons. In an $e^{+} e^{-}$ experiment the lightest charmed baryon, $\Lambda_c^{+}$, can be produced in pairs through the single photon annihilation process. This process can be described by two complex electromagnetic form factors. The presence of a non-zero relative phase between these form factors gives rise to a transverse polarization of the charmed baryon and provides additional constraints on the dynamic parameters in the decays. In this article, we present the first observation of the transverse polarization of $\Lambda_c^{+}$ in the reaction $e^{+} e^{-} \rightarrow \Lambda_c^{+} \bar{\Lambda}_c^{-}$, based on $6.4 \mathrm{fb}^{-1}$ of $e^{+} e^{-}$annihilation data collected at center-of-mass energies between 4600 MeV and 4951 MeV with the BESIII detector. The decay asymmetry parameters and strong phase shift in the decays $\Lambda_c^{+} \rightarrow p K_S^0, \Lambda \pi^{+}, \Sigma^0 \pi^{+}, \Sigma^{+} \pi^0$ are also simultaneously extracted from the joint angular distributions. These results are vital for understanding $C P$ violation and its role in the matter-antimatter asymmetry of the Universe.

Primary authors

Dr Hao Sun (UCAS) Dr Hongjian Wang (Lanzhou University) Dr Kunlin Han (University of Chinese Academy of Sciences) Prof. Peirong Li (Lanzhou University) Prof. Ronggang Ping (IHEP) Hailong Ma (IHEP) Prof. Xiao-Rui Lyu (University of Chinese Academy of Sciences) Yangheng Zheng (University of Chinese Academy of Sciences)

Presentation materials

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