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arXiv 0803.2102hep-ph
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手征夸克模型中重-轻介子的强衰变

Strong decays of heavy-light mesons in a chiral quark model

Xian-hui Zhong, Qiang Zhao

备注：
14 pages, 6 figures,to appear in PRD
发表信息：
Phys.Rev.D78:014029,2008
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摘要：

本文在手征夸克模型中对重-轻介子强衰变进行了系统的研究。对于$S$波矢量（$D^*(2007)$，$D^{*\pm}(2010)$），$P$波标量（$D^*_0(2400)$，$B^*_0(5730)$）和张量（$D^*_2(2460)$，$D^*_{s2}(2573)$），我们得到的结果与实验数据符合得很好.对于轴向矢量$D_1(2420)$和$D_1^\prime(2430)$，$1^1P_1$和$1^3P_1$之间的状态混合方案是有利的混合角$ϕ\simeq-(55\pm 5)^\circ$，这与以前的理论预测是一致的。相同的混合方案也适用于$D_{s1}(2460)$和$D_{s1}(2536)$，其解释了$D_{s1}(2536)$的窄宽度及其主要衰减成$D^*K$。对于$B_1(5725)$和$B_1^\prime(5732)$，这种混合很好地解释了前者的衰减宽度，但导致更宽的$B_1^\prime(5732)$。对奇异底轴向矢量也作了预测。对于待定介子$D^*(2640)$，我们发现它们很好地符合径向激发态$2^3S_1$的衰变模式。新观察到的$D^*_{sJ}(2860)$强烈倾向于$D$波激发态$1^3D_3$.对于$D^*_{sJ}(2632)$和$D^*_{sJ}(2690)$，我们发现，如果实验数据是准确的，他们是很难适应任何$D_s$激发在该质量区。理论预测的衰变模式的未观察到的状态作为多重态的2S和1D波，这应该是有用的，为进一步的实验研究这些状态。

英文摘要：

We carry out a systematic study of the heavy-light meson strong decays in a chiral quark model. For the $S$-wave vectors ($D^*(2007)$, $D^{*\pm}(2010)$), $P$-wave scalars ($D^*_0(2400)$, $B^*_0(5730)$) and tensors ($D^*_2(2460)$, $D^*_{s2}(2573)$), we obtain results in good agreement with the experimental data. For the axial vectors $D_1(2420)$ and $D_1^\prime(2430)$, a state mixing scheme between $1^1P_1$ and $1^3P_1$ is favored with a mixing angle $ϕ\simeq-(55\pm 5)^\circ$, which is consistent with previous theoretical predictions. The same mixing scheme also applies to $D_{s1}(2460)$ and $D_{s1}(2536)$ that accounts for the narrow width of the $D_{s1}(2536)$ and its dominant decay into $D^*K$. For $B_1(5725)$ and $B_1^\prime(5732)$, such a mixing explains well the decay width of the former but leads to an even broader $B_1^\prime(5732)$. Predictions for the strange-bottom axial vectors are also made. For the undetermined meson $D^*(2640)$, we find that they fit in well the radially excited state $2^3S_1$ according to its decay mode. The newly observed $D^*_{sJ}(2860)$ strongly favors the $D$-wave excited state $1^3D_3$. For $D^*_{sJ}(2632)$ and $D^*_{sJ}(2690)$, we find they are difficult to fit in any $D_s$ excitations in that mass region, if the experimental data are accurate. Theoretical predictions for decay modes of those unobserved states as multiplets of 2S and 1D waves are also presented, which should be useful for further experimental search for those states.

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