Speaker
Description
This talk is based a recent BESIII paper [DOI:10.1016/j.scib.2026.04.059]. Based on BESIII $e^+e^-$ annihilation data produced at $\sqrt{s}=4.178$~GeV, this work precisely measures the mass splitting between $D_s^{*+}$ and $D_s^{+}$ using the reconstructed decay signal of $1411 \pm 77$ events of $D_s^{*+} \to D_s^{+}(\to K^+K^-\pi^+)\pi^0$. A novel data-driven method is developed, which uses the existing high-precision measurement of the $D^{*+}-D^{+}$ mass splitting as input, and calibrates the $\pi^0$ reconstruction momentum using a high-statistics data sample of $D^{*+} \to D^{+}(\to K^- \pi^+\pi^+)\pi^0$, thereby effectively reducing detector-related systematic uncertainties. The measured mass difference $D_s^{*+} - D_s^{+}$ is $\Delta m_s = 144\,201.9 \pm 44.2\,(\text{stat.}) \pm 29.9\,(\text{syst.}) \pm 15.0\,(\text{input})$, which is seven times more precise than the current world average. This result provides a stringent test of lattice QCD calculations and theoretical models based on chiral perturbation theory.
| 请选择分会 | 强子物理与味物理 |
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