arXiv subjects

Wei-Hong Liang

Publications and source records attributed to Wei-Hong Liang.

75 records · Page 5Linked to original sources

arXiv2015

Baryon states with hidden charm in the extended local hidden gauge approach

The s-wave interaction of $\bar{D} Λ_c, \bar{D} Σ_c, \bar{D} Λ_c, \bar{D}{}^* Σ_c$ and $\bar{D}Σ^*_c, \bar{D}{}^*Σ^*_c$, is studied within a unitary coupled channels scheme with the extended local hidden gauge approach. In addition to the Weinberg-Tomozawa term, several additional diagrams via the pion-exchange are also taken into account as box potentials. Furthermore, in order to implement the full coupled channels calculation, some of the box potentials which mix the vector-baryon and pseudoscalar-baryon sectors are extended to construct the effective transition potentials. As a result, we have observed six possible states in several angular momenta. Four of them correspond to two pairs of admixture states, two of $\bar{D}Σ_c$ - $\bar{D}{}^*Σ_c$ with $J^P = 1/2^-$, and two of $\bar{D}Σ^*_c$ - $\bar{D}{}^*Σ^*_c$ with $J^P = 3/2^-$. Moreover, we find a $\bar{D}{}^* Σ_c$ resonance which couples to the $\bar{D}Λ_c$ channel and one spin degenerated bound state of $\bar{D}{}^*Σ^*_c$ with $J^P = 1/2^-, 5/2^-$.

hep-ph↗

arXiv2007

Light vector hybrid states via QCD sum rules

Vector hybrid states with light quarks $u,d,s$ are investigated via QCD sum rules. The results show that the masses of the $q{\bar q}g$ $(q=u,d)$, $q{\bar s}g$, and $s{\bar s}g$ states with $J^{PC}=1^{--}$ are about 2.3-2.4, 2.3-2.5, and 2.5-2.6 GeV, respectively. It suggests that the recently discovered Y(2175) could not be a pure $s{\bar s}g$ vector hybrid state.

hep-ph↗

arXiv2004

Nucleon pole contributions in $J/ψ\to N \bar{N} π$, $p \bar{p} η$, $p \bar{p} η^{\prime}$ and $p \bar{p} ω$ decays

Nucleon pole contributions in $J/ψ\to N \bar N π$, $p \bar p η$, $p \bar p η^{\prime}$ and $p \bar{p} ω$ decays are re-studied. Different contributions due to PS-PS and PS-PV couplings in the $π$-N interaction and the effects of $NNπ$ form factors are investigated in the $J/ψ\to N \bar N π$ decay channel. It is found that when the ratio of $|F_0| /|F_M|$ takes small value, without considering the $NNπ$ form factor, the difference between PS-PS and PS-PV couplings are negligible. However, when the $NNπ$ form factor is included, this difference is greatly enlarged. The resultant decay widths are sensitive to the form factors. As a conclusion, the nucleon-pole contribution as a background is important in the $J/ψ\to N\bar{N}π$ decay and must be accounted. In the $J/ψ\to N\bar{N}η$ and $N\bar{N}η'$ decays, its contribution is less than 0.1% of the data. In the $J/ψ\to N\bar{N}ω$ decay, it provides rather important contribution without considering form factors. But the contribution is suppressed greatly when adding the off-shell form factors. Comparing these results with data would help us to select a proper form factor for such kind of decay.

nucl-th↗