arXiv subjects

Qiu-Yang Zhang

Publications and source records attributed to Qiu-Yang Zhang.

2 recordsLinked to original sources

arXiv2011

A Primary Study of Heavy Baryons Lambda_Q, Xi_Q, Sigma_Q and Omega_Q

We perform a preliminary study of the 1/2+ and 3/2+ ground-state baryons containing a heavy quark in the framework of the chiral SU(3) quark model. By using the calculus of variations, masses of Lambda_Q, Sigma_Q, Xi_Q, Omega_Q, Sigma_Q^*, Xi_Q^* and Omega_Q^*, where Q means c or b quark, are calculated. With taking reasonable model parameters, the numerical results of established heavy baryons are generally in agreement with the available experimental data, except that those of Xi_Q are somewhat heavier. For Omega_b with undetermined experimental mass and nobserved Xi_b^*, Omega_b^*, reasonable theoretical predictions are obtained. Interactions inside baryons are also discussed.

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arXiv2009

S-wave DK interactions in the chiral SU(3) quark model

The $DK$ interaction is relevant to the interpretation of the $D_{sJ}(2317)$. We dynamically investigate $S$-wave $DK$ interactions in the chiral SU(3) quark model by solving the resonating group method equation. The numerical results show an attraction between $D$ and $K$, which is from boson exchanges between light quarks. However, such an attraction is not strong enough to form a $DK$ molecule. Meanwhile, $S$ partial wave phase shifts of $DK$ elastic scattering are obtained. The case of $S$-wave $D^*K$ is rather similar to that of $DK$. To draw a definite conclusion whether a molecular state exists in $DK$ or $D^*K$ system, more details of dynamics should be considered in further study.

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