Hidden-strange molecular states and the bound states via a QCD van der Waals force
| Autor: | Jun He, Xinmei Zhu, Dian-Yong Chen, Hongxia Huang |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Coupling constant
Physics Quantum chromodynamics Particle physics Bethe–Salpeter equation Meson Nuclear Theory 010308 nuclear & particles physics 01 natural sciences Computer Science::Digital Libraries symbols.namesake High Energy Physics - Phenomenology OZI rule 0103 physical sciences symbols Vector meson van der Waals force 010306 general physics Nucleon Nuclear Experiment |
| Zdroj: | Physical Review |
| Popis: | In this work, we study the hidden-strange molecular states composed of a baryon and a vector meson in a coupled-channel $N\rho-N\omega-N\phi-\Lambda K^*-\Sigma K^*$ interaction. With the help of the effective Lagrangians which coupling constants are determined by the SU(3) symmetry, the interaction is constructed and inserted into the quasipotential Bethe-Salpeter equation to search for poles in the complex plane, which correspond to molecular states. Two poles are found with a spin parity $3/2^-$ near the $N\rho$ and the $\Sigma K^*$ thresholds, which can be related to the $N(1700)$ and the $N(2100)$, respectively. No pole near the $N\phi$ threshold can be found if direct interaction between a nucleon and $\phi$ meson is neglected according to the OZI rule. After introducing the QCD van der Waals force between a nucleon and $\phi$ meson, a narrow state can be produced near the $N\phi$ threshold. Inclusion of the QCD van der Waals force changes the line shape of the invariant mass spectrum in the $N\phi$ channel leading to a worse agreement with the present low-precision data. Future experiments at BelleII, JLab, and other facilities will be very helpful to clarify the existence of these possible hidden-strange molecular states. Comment: 6 pages, 1 figure. Version to be published in Phys. Rev. D. Comparison with the Belle experiment is added |
| Databáze: | OpenAIRE |
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