arXiv subjects

Lian-Rong Dai

Publications and source records attributed to Lian-Rong Dai.

4 recordsLinked to original sources

arXiv2026

Role of $Ξ(1690)$ in the $J/ψ\toΞ^0\barΛK^0$ reaction

Motivated by the recent BESIII measurements of the $J/ψ\to Ξ^0 \barΛK_S^0 + c.c.$ process, we investigate this reaction by considering the contributions from the $Ξ(1690)$, $Λ(1890)$ and $Λ(1830)$ resonances. The $Ξ(1690)$ state is dynamically generated from the $S$-wave pseudoscalar meson-octet baryon interactions within the chiral unitary approach. Our theoretical model provides a good description of the $\barΛK^0$, $Ξ^0 K^0$, and $\barΛΞ^0$ invariant mass distributions. The results indicate that the $Ξ(1690)$ resonance, which was neglected in the experimental analysis by BESIII, plays a crucial role in this process. Furthermore, we evaluate the theoretical uncertainties of our model using the parametric bootstrap method. Future high-precision measurements of this process will further help to elucidate the properties of the $Ξ(1690)$, $Λ(1890)$ and $Λ(1830)$ states.

hep-ph↗

arXiv2015

Study of the $f_2(1270)$, $f'_2(1525)$, $\bar{K}^*_{2}(1430)$, $f_0(1370)$ and $f_0(1710)$ production from $ψ(nS)$ and $Υ(nS)$ decays

Based on previous studies that support the important role of the $f_2(1270)$, $f'_2(1525)$, and $\bar{K}^{*}_{2}(1430)$ resonances in the $J/ψ[ψ(2S)] \to ϕ(ω) VV$ decays, we make an analysis of the analogous decays of $Υ(1S)$ and $Υ(2S)$, taking into account recent experimental data. In addition, we study the $J/ψ$ and $ψ(2S)$ radiative decays and we also made predictions for the radiative decay of $Υ(1S)$ and $Υ(2S)$ into $γf_2(1270)$, $γf'_2(1525)$, $γf_0(1370)$ and $γf_0(1710)$, comparing with the recent results of a CLEO experiment. We can compare our results for ratios of decay rates with eight experimental ratios and find agreement in all but one case, where experimental problems are discussed.

hep-ph↗

arXiv2009

New exact solutions of the standard pairing model for well-deformed nuclei

A new step-by-step diagonalization procedure for evaluating exact solutions of the nuclear deformed mean-field plus pairing interaction model is proposed via a simple Bethe ansatz in each step from which the eigenvalues and corresponding eigenstates can be obtained progressively. This new approach draws upon an observation that the original one- plus two-body problem in a $k$-particle Hilbert subspace can be mapped unto a one-body grand hard-core boson picture that can be solved step by step with a simple Bethe ansatz known from earlier work. Based on this new procedure, it is further shown that the extended pairing model for deformed nuclei [Phys. Rev. Lett. 92, 112503 (2004) ] is similar to the standard pairing model with the first step approximation, in which only the lowest energy eigenstate of the standard pure pairing interaction part is taken into consideration. Our analysis show that the standard pairing model with the first step approximation displays similar pair structures of first few exact low-lying states of the model, which, therefore, provides a link between the two models.

nucl-th↗

arXiv2005

$ΔΔ$ dibaryon structure in extended chiral SU(3) quark model

The structure of $ΔΔ$ dibaryon is studied in the extended chiral SU(3) quark model in which vector meson exchanges are included. The effect from the vector meson fields is very similar to that from the one-gluon exchange (OGE) interaction. Both in the chiral SU(3) quark model and in the extended chiral SU(3) quark model, the resultant mass of the $ΔΔ$ dibaryon is lower than the threshold of the $ΔΔ$ channel but higher than that of the $ΔNπ$ channel.

nucl-th↗