Wen-Cheng Yan | Searcharxiv

arXiv2025

Study $\Xi_c^+ \to \Lambda {\bar{K}}^0 \pi^+$ and search for the low-lying baryons $\Xi(1/2^-)$ and $\Sigma(1/2^-)$

Since searches for the low-lying excited baryons $\Xi(1/2^-)$ and $\Sigma(1/2^-)$ are crucial to deepening our understanding of the light baryon spectrum, we have investigated the Cabibbo-favored process $\Xi_c^+ \to \Lambda {\bar{K}}^0 \pi^+$ by taking into account the $S$-wave pseudoscalar meson-octet baryon interactions within the chiral unitary approach, which could dynamically generate the resonances $\Xi(1/2^-)$ and $\Sigma(1/2^-)$. The contributions from the excited kaons are double Cabibbo-suppressed, and the contribution from the $\Sigma(1385)$ is also suppressed due to Korner-Pati-Woo theory, thus those states are expected to play negligible contributions in this process. We have predicted the $\bar{K}^0 \Lambda$ and $\pi^+\Lambda$ invariant mass distributions, which have the clear signals of the $\Xi(1/2^-)$ and $\Sigma(1/2^-)$. Thus, the $\Xi_c^+ \to \Lambda {\bar{K}}^0 \pi^+$ is an ideal process to search for the low-lying baryons $\Xi(1/2^-)$ and $\Sigma(1/2^-)$, and we make a call for a precise measurements of this process in experiments, such as Belle II, LHCb, and the proposed Super Tau-Charm Facility (STCF).

hep-ph↗

arXiv2021

Assignments of the $Y(2040)$, $ρ(1900)$, and $ρ(2150)$ in the quark model

Recently, the BESIII Collaboration reported a resonance $Y(2040)$ with $M=2034\pm13\pm9$ MeV and $Γ=234\pm30\pm25$ MeV in the process of $e^+e^-\rightarrowωπ^0$. In addition, new measurements with much higher precision for the $ρ(1900)$ and $ρ(2150)$ states are obtained by the BESIII and BABAR Collaborations. In this work, we perform a systematic study on the mass spectrum of the excited $ρ$ resonances using the modified Godfrey-Isgur model, and the strong decays of $Y(2040)$, $ρ(1900)$, and $ρ(2150)$ within the $^3P_0$ model.We find that $Y(2040)$, $ρ(1900)$, and $ρ(2150)$ can be interpreted as the $ρ(2^3D_1)$, $ρ(3^3S_1)$, and $ρ(4^3S_1)$ states, respectively. Meanwhile, the mass and strong decays of the $ρ(3^3D_1)$ state are predicted as well, which could be helpful to search for this state in future.

hep-ph↗