arXiv subjects

Yun-He Lyu

Publications and source records attributed to Yun-He Lyu.

4 recordsLinked to original sources

arXiv2025

Theoretical study of the open-flavor tetraquark $T_{c\bar{s}}(2900)$ in the process $Λ_b\to K^0D^0Λ$

Recently, the LHCb Collaboration has measured the processes $B^0\to\bar{D}^0D_s^+π^-$ and $B^+\to\bar{D}^0D_s^+π^+$, where the $D_s^+π^-$ and $D_s^+π^+$ invariant mass distributions show the significant signals of two new open-flavor tetraquark states $T_{c\bar{s}}(2900)^0$ and $T_{c\bar{s}}(2900)^{++}$, as the two of the isospin triplet. In this work, we have investigated the process $Λ_b\to K^0D^0Λ$ by taking into account the intermediate nucleon resonance $N^*(1535)$ and the tetraquark state $T_{c\bar{s}}(2900)^0$, which could be dynamically generated by the interactions of the $D^*K^*/D^*_sρ$ and the pseoduscalar mesons-octet baryons, respectively. Our results show that a clear peak of the open-flavor tetraquark $T_{c\bar{s}}(2900)$ may appear in the $K^0D^0$ invariant mass distribution of the process $Λ_b\to K^0D^0Λ$, which could be tested by future experiments.

hep-ph↗

arXiv2024

The roles of the $T_{c\bar{s}0}(2900)^0$ and $D_0^*(2300)$ in the process $B^-\to D_s^+K^-π^-$

Motivated by the recent LHCb observations of $T_{c\bar{s}0}(2900)^0$ and $T_{c\bar{s}0}(2900)^{++}$ in the processes $B^0\to\bar{D}^0D_s^+π^-$ and $B^+\to D^-D_s^+π^+$, we have investigated the decay $B^-\to D_s^+K^-π^-$ by taking into account the contributions from the $S$-wave vector-vector interactions, and the $S$-wave $D^+_s K^-$ interactions. Our results show that the $D_s^+K^-$ invariant mass distribution has an enhancement structure near the threshold, associated with the $D^*_0(2300)$, which is in good agreement with the Belle measurements. We have also predicted the $D^+_sπ^-$ invariant mass distribution and the Dalitz plot, which show the significant signal of the $T_{c\bar{s}0}(2900)$. With the same formalism, the $D^-_sK^0_s$ invariant mass distribution of the process $B^0 \to D^-_sK^0_sπ^+$ measured by Belle could be well reproduced, and the peak of $T_{c\bar{s}0}(2900)$ is expected to be observed around 2900~MeV in the $D^-_sπ^+$ invariant mass distribution. Our results could be tested by the Belle II and LHCb experiments in the future.

hep-ph↗

arXiv2023

Role of the scalar $f_0(980)$ in the process $D_s^+ \to π^{+} π^{0} π^{0}$

Based on the BESIII measurements on the reaction of $D_s^+\to π^+π^0π^0$, we investigate this process by considering the $S$-wave pseudoscalar-pseudoscalar interaction within the unitary chiral approach, and the contributions from the intermediate resonances $f_0(1370)$ and $f_2(1270)$. Our calculation could reasonably reproduce the experimental data, and our results imply that the $f_0(980)$, dynamically generated from the $S$-wave pseudoscalar-pseudoscalar interaction, plays an important role in this process, and the contributions from the intermediate resonances $f_0(1370)$ and $f_2(1270)$ are also necessary. The more precise measurements of this process in future could shed light on the nature of the $f_0(1370)$ and $f_2(1270)$.

hep-ph↗

arXiv2023

Photo-production of lowest $Σ^*_{1/2^-}$ state within the Regge-effective Lagrangian approach

Since the lowest $Σ^{*}$ state, with quantum numbers spin-parity $J^{P} =1/2^{-}$, is far from established experimentally and theoretically, we have performed a theoretical study on the $Σ^*_{1/2^-}$ photo-production within the Regge-effective Lagrangian approach. Taking into account that the $Σ^*_{1/2^-}$ couples to the $\bar{K}N$ channel, we have considered the contributions from the $t$-channel $K$ exchange diagram. Moreover, these contributions from $t$-channel $K^*$ exchange, $s$-channel nucleon pole, $u$-channel $Σ$ exchange, and the contact term, are considered. The differential and total cross sections of the process $γn \to K^{+}Σ^{*-}_{1/2^-}$ are predicted with our model parameters. The results should be helpful to search for the $Σ^*_{1/2^-}$ state experimentally in future.

hep-ph↗