arXiv 1405.22422014-05-09hep-phhep-ex

$D_{s0}^*(2317)$和$D_{s1}(2460)$的强衰变和辐射衰变

Strong and radiative decays of the $D_{s0}^*(2317)$ and $D_{s1}(2460)$

Martin Cleven, Harald W. Grießhammer, Feng-Kun Guo, Christoph Hanhart, Ulf-G. Meißner

发表信息：: Eur. Phys. J. A (2014) 50: 149
DOI：: 10.1140/epja/i2014-14149-y

摘要：

自2003年发现以来，开放魅力态$D_{s0}^*(2317)$和$D_{s1}(2460)$对传统的夸克模型提出了挑战。近年来，理论证据已经积累了两个国家的优势$DK$和$D^*K$的分子性质，分别。然而，这一假设的直接实验证据仍然需要找到。由于辐射衰变通常被认为是敏感的内部结构的衰变粒子，我们在这项工作中研究的辐射和强衰变的$D_{s0}^*(2317)$和$D_{s1}(2460)$，以及他们的对应物在底部的部门。虽然分子态的强衰变确实被强烈增强，但辐射衰变在不同的图像中具有相似的数量级。因此，实验观察到的，使人们能够决定性地量化的分子组成的$D_{s0}^*(2317)$和$D_{s1}(2460)$是强子宽度，而不是辐射的，在对比的共同信念。我们还发现，辐射衰变的兄弟国家的底部部门显着更频繁的强子的。在此基础上，我们确定了他们最有前途的发现渠道。

英文摘要：

Since their discovery in 2003, the open charm states $D_{s0}^*(2317)$ and $D_{s1}(2460)$ provide a challenge to the conventional quark model. In recent years, theoretical evidence has been accumulated for both states in favor of a predominantly $DK$ and $D^*K$ molecular nature, respectively. However, a direct experimental proof of this hypothesis still needs to be found. Since radiative decays are generally believed to be sensitive to the inner structure of the decaying particles, we study in this work the radiative and strong decays of both the $D_{s0}^*(2317)$ and $D_{s1}(2460)$, as well as of their counterparts in the bottom sector. While the strong decays are indeed strongly enhanced for molecular states, the radiative decays are of similar order of magnitude in different pictures. Thus, the experimental observable that allows one to conclusively quantify the molecular components of the $D_{s0}^*(2317)$ and $D_{s1}(2460)$ is the hadronic width, and not the radiative one, in contradistinction to common belief. We also find that radiative decays of the sibling states in the bottom sector are significantly more frequent than the hadronic ones. Based on this, we identify their most promising discovery channels.

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