arXiv 2003.004872020-03hep-ph

通过强衰变分析确定$D_{sJ}^*(2860)$为四个共振态

Identifying $D_{sJ}^*(2860)$ as a four resonance states through strong decay analysis

Keval Gandhi, Ajay Kumar Rai, Takayuki Matsuki

备注：: 14 pages

摘要：

根据自旋、宇称和质量，对实验上观测到的激发态奇异粲介子$D_{s0}^*(2317)^{\pm}$、$D_{s1}(2460)^{\pm}$、$D_{s1}(2536)^{\pm}$、$D_{s2}^*(2573)^{\pm}$、$D_{s1}^*(2700)^{\pm}$、$D_{s1}^*(2860)^{\pm}$、$D_{s3}^*(2860)^{\pm}$和$D_{sJ}(3040)^{\pm}$进行了初步鉴定.在首阶近似下，利用重夸克有效理论研究了它们到基态粲介子加轻赝标介子的强衰变。在重夸克二重态中，分支比被分类，$(D_{s0}^*(2317), D_{s1}(2460))$为$(1^3P_0, 1P_1)$，$(D_{s1}(2536), D_{s2}^*(2573))$为$(1P_1^{\prime}, 1^3P_2)$。$D_{s1}^*(2700)$作为$2^3S_1$和它的自旋伙伴$2^1S_0$在实验中仍然缺失。预测了它的强衰变行为。将$D_{sJ}^*(2860)$指定为四个共振态态$D_{s1}^*(2860)$、$D_{s2}^*(2860)$、$D_{s2}^{*\prime}(2860)$、$D_{s3}^*(2860)$是有利的，其中对于$D_{s3}^*(2860)^{\pm}$，质量应该预期高于2.86 GeV。$D_{sJ}(3040)$更可能是2 $P_1$状态。我们构造了实验观测到的奇异粲介子在$(M^2, J)$和$(M^2, n_r)$平面上的Regge轨线，通过固定Regge轨线的斜率和截距，估计了$1^3D_3$、$1^3F_4$、$1D_2$、$1^1F_3$、$1D_2^{\prime}$、$1F_3^{\prime}$、$3^3S_1$和$3P_1$态的质量.此外，还考察了这些较高激发态的强衰变率和分支比，从而区分了这些较高激发态的主导衰变通道。我们的结果可以为LHCb、BESIII、KEK-B以及即将进行的Belle II和$\overline{\mbox{\sffamily P}}$ { \sffamily ANDA}实验提供重要的线索。

英文摘要：

Experimentally observed excited strange charmed mesons $D_{s0}^*(2317)^{\pm}$, $D_{s1}(2460)^{\pm}$, $D_{s1}(2536)^{\pm}$, $D_{s2}^*(2573)^{\pm}$, $D_{s1}^*(2700)^{\pm}$, $D_{s1}^*(2860)^{\pm}$, $D_{s3}^*(2860)^{\pm}$, and $D_{sJ}(3040)^{\pm}$ are identified tentatively according to their spin, parity, and masses. Using the heavy quark effective theory in the leading order approximation, we study their strong decays to ground state charmed mesons plus light pseudoscalar mesons. The branching ratios are classified, $(D_{s0}^*(2317), D_{s1}(2460))$ as $(1^3P_0, 1P_1)$ and $(D_{s1}(2536), D_{s2}^*(2573))$ as $(1P_1^{\prime}, 1^3P_2)$, in heavy quark doublets. The $D_{s1}^*(2700)$ as $2^3S_1$ and its spin partner, $2^1S_0$ is still missing in the experiment. Its strong decay behavior is predicted. The assignment of $D_{sJ}^*(2860)$ as four resonance states $D_{s1}^*(2860)$, $D_{s2}^*(2860)$, $D_{s2}^{*\prime}(2860)$, $D_{s3}^*(2860)$ is favored, where for $D_{s3}^*(2860)^{\pm}$ the mass should be expected to higher than 2.86 GeV. The $D_{sJ}(3040)$ is more likely to be 2$P_1$ state. We construct the Regge trajectories of experimentally observed strange charmed mesons in $(M^2, J)$ and $(M^2, n_r)$ planes, which estimate the masses of $1^3D_3$, $1^3F_4$, $1D_2$, $1^1F_3$, $1D_2^{\prime}$, $1F_3^{\prime}$, $3^3S_1$, and $3P_1$ states with fixing the slopes and intercepts of the Regge lines. Moreover, the strong decay rates and the branching ratios of these higher excited states are also examined, which distinguished the dominant decay channels for these higher excited states. Our results could provide some important clues in LHCb, BESIII, KEK-B, and the forthcoming Belle II and $\overline{\mbox{\sffamily P}}${\sffamily ANDA} experiments.

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摘要：

英文摘要：

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