arXiv subjects

Bing-song Zou

Publications and source records attributed to Bing-song Zou.

6 recordsLinked to original sources

arXiv2025

Production of Hyperons, Charmed Baryons, and Hadronic Molecule Candidates in Neutrino-Proton Reaction

We investigate the production of hyperons, charmed baryons, and potential hadronic molecular states in neutrino-proton $(\barν_μp)$ reaction, a process characterized by a particularly clean final state. Employing effective Lagrangians, chiral perturbation theory, and a hadronic molecular model, we perform theoretical calculations for several relevant channels, including those leading to the formation of the hadronic molecular candidate $(\bar{D}N)$ and $(\bar{D}Σ)$. Our results indicate that future neutrino facilities could serve as a complementary platform for exploring exotic baryonic states and provide valuable insights into the dynamics of strong interactions in the strange and charm sectors.

hep-ph↗

arXiv2017

Decay behaviors of Pc hadronic molecules

The $P_c(4380)$ and $P_c(4450)$ states observed recently by LHCb experiment were proposed to be either $\bar{D} Σ_c^*$ or $\bar{D}^* Σ_c$ S-wave bound states of spin parity $J^P={\frac32}^-$. We analyze the decay behaviors of such two types of hadronic molecules within the effective Lagrangian framework. With branching ratios of ten possible decay channels calculated, it is found that the two types of hadronic molecules have distinguishable decay patterns. While the $\bar{D} Σ_c^*$ molecule decays dominantly to $\bar{D}^* Λ_c$ channel with a branching ratio by 2 orders of magnitude larger than to $\bar{D}Λ_c$, the $\bar{D}^* Σ_c$ molecule decays to these two channels with a difference of less than a factor of 2. Our results show that the total decay width of $P_c(4380)$ as the spin-parity-${\frac32}^-$ $\bar{D} Σ_c^*$ molecule is about a factor of 2 larger than the corresponding value for the $\bar{D}^* Σ_c$ molecule. It suggests that the assignment of $\bar{D} Σ_c^*$ molecule for $P_c(4380)$ is more favorable than the $\bar{D}^* Σ_c$ molecule. In addition, $P_c(4450)$ seems to be a $\bar{D}^* Σ_c$ molecule with $J^P={\frac52}^+$ in our scheme. Based on these partial decay widths of $P_c(4380)$, we estimate the cross sections for the reactions $γp \to J/ψp $ and $ πp\to J/ψp $ through the s-channel $P_c(4380)$ state. The forthcoming $γp$ experiment at JLAB and $πp$ experiment at JPARC should be able to pin down the nature of these $P_c$ states.

hep-ph↗

arXiv2011

$J/ψ\rightarrow p\bar{p}ϕ$ decay in the isobar resonance model

Based on the effective Lagrangian approach, the $ J/ψ\to p \bar{p} ϕ$ decay is studied in an isobar resonance model with the assumption that the $ϕ$-meson is produced from intermediate nucleon resonances. The contributions from the $N^*_{1/2^-}(1535)$, $N^*_{3/2^+}(1900)$, $N^*_{1/2^-}(2090)$ and $N^*_{1/2^+}(2100)$ states are considered. In terms of the coupling constants $g^{2}_{ϕN N^{*}}$ and $g^{2}_{ϕN N^{*}}$ extracted from the data of the partial decay widths of the $N^*$s to the $Nπ$ channel, the reaction cross section of the $π^{-}p\rightarrow nϕ$ process and the partial decay widths of the $J/ψ\rightarrow p\bar{p}η$ and $J/ψ\rightarrow p\bar{n}π^{-}$ processes, respectively, the invariant mass spectrum and the Dalitz plot for $ J/ψ\to p \bar{p} ϕ$ are predicted. It is shown that there are two types of results. In the type I case, a large peak structure around 2.09GeV implies that a considerable mount of $Nϕ$ or $qqqs\bar s$ component may exist in the narrow-width $N^*_{1/2^-}(2090)$ state, but for the wide-width $N^*_{1/2^+}(2100)$ state, it has little $qqqs\bar s$ component. In the type II case, a small peak around 2.11GeV may only indicate the existence of a certain mount of $pϕ$ or $qqqs\bar s$ component in the narrow-width $N^*_{1/2^+}(2100)$ state, but no information for the wide-width $N^*_{1/2^-}(2090)$ state. Further BESIII data with high statistics would help us to distinguish the strange structures of these $N^*$s.

nucl-th↗

arXiv2005

Glueball-$Q\bar{Q}$ mixing and Okuba-Zweig-Iizuka rule violation in the hadronic decays of heavy quarkonia

We investigate the correlations between the scalar meson configurations and Okuba-Zweig-Iizuka (OZI) rule violations in the hadronic decays of heavy quarkonia, e.g. $J/ψ$ and $Υ$, into isoscalar vector meson ($ϕ$ and $ω$) and scalar mesons ($f_0(1710)$, $f_0(1500)$, and $f_0(1370)$). It shows that the dramatic change of the values of the branching ratio fraction of $ϕf_0/ωf_0$ from low (e.g. in $J/ψ$ decays) to high energies (e.g. in $Υ$ decays) will not only test the glueball-$Q\bar{Q}$ mixings, but also provide important information about the mysterious OZI-rule violations within the scalars.

hep-ph↗

arXiv2002

Studying Kaon-pion S-wave scattering in K-matrix formalism

We generalize our previous work on ππscattering to Kπscattering, and re-analyze the experiment data of Kπscattering below 1.6 GeV. Without any free parameter, we explain KπI=3/2 S-wave phase shift very well by using t-channel rho and u-channel K^* meson exchange. With the t-channel and u-channel meson exchange fixed as the background term, we fit the KπI=1/2 S-wave data of the LASS experiment quite well by introducing one or two s-channel resonances. It is found that there is only one s-channel resonance between Kπthreshold and 1.6 GeV, i.e., K_0^*(1430) with a mass around 1438~1486 MeV and a width about 346 MeV, while the t-channel rho exchange gives a pole at (450-480i) MeV for the amplitude.

hep-ph↗

arXiv2000

A New Decomposition of pion-pion S-wave Interaction

The experimental isoscalar $ππ\toππ$ S-wave amplitude squared below 1.75 GeV is characterized by a very broad structure $f_0(400-1200)$ with two narrow dips due to its destructive interference with the $f_0(980)$ and $f_0(1500)$. The $f_0(1370)$ and $f_0(1710)$ do not show up clearly in the $ππ\toππ$ S-wave amplitude due to their weak coupling to $ππ$. This paper is about the controversial nature of the broad $f_0(400-1200)$. We decompose it into two parts, i.e., t-channel $ρ$ meson exchange plus an additional s-channel resonance $f_0(X)$. With the t-channel $ρ$ meson exchange fixed by the isotensor $ππ\toππ$ S-wave scattering, we re-fit the CERN-Munich (CM) data on $ππ$ scattering to get parameters for the $f_0(X)$. We find that the $f_0(X)$ is very broad with a nearby pole at (1.67-0.26i) GeV, while the t-channel $ρ$ meson exchange part produces a pole at (0.36-0.53i) GeV. The implication of our results for the study of $σ$ and glueball is discussed.

hep-ph↗