arXiv subjects
Publications and source records attributed to J. Cheng.
We show that the use of a generalized atom-molecule dark state permits the enhanced coherent creation of triatomic molecules in a repulsive atomic Bose-Einstein condensate, with further enhancement being possible in the case of heteronuclear trimers via the constructive interference between two chemical reaction channels.
We report the measurements of $Σ(1385)$ and $Λ(1520)$ production in $p+p$ and $Au+Au$ collisions at $\sqrt{s_{NN}} = 200$ GeV from the STAR collaboration. The yields and the $p_{T}$ spectra are presented and discussed in terms of chemical and thermal freeze-out conditions and compared to model predictions. Thermal and microscopic models do not adequately describe the yields of all the resonances produced in central $Au+Au$ collisions. Our results indicate that there may be a time-span between chemical and thermal freeze-out during which elastic hadronic interactions occur.
The effects of intensity interferometry (HBT), which are mainly reflected by the measured momentum correlations, have been fully discussed since 1950's. The analogous momentum correlations between identical fermions are however less argued. Besides the fermion statistics, the momentum correlations between identical fermions are also determined by some other aspects, such as coulomb interaction, spin interactions and resonances formation. In this paper, we discussed the factors that influence the momentum correlations between $Λ$'s, especially spin interaction. It is also argued that the momentum correlations between $Λ$'s are affected significantly by the yield ratio of $Σ^0/Λ$, due to the limitation of experimental measurement. The mixture of $Σ^0$'s and $Λ$s would significantly weaken the measured two-particle momentum correlations of $Λ$'s.