arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2008.07145hep-phhep-ex
收藏

开粲四夸克态$X_c$和开底四夸克态$X_b$

Open-charm tetraquark $X_c$ and open-bottom tetraquark $X_b$

Xiao-Gang He, Wei Wang, Ruilin Zhu

备注：
9 pages, 4 tables; the published version
发表信息：
Eur. Phys. J. C (2020) 80:1026
阅读 PDF
arXiv 页面 ↗HTML 原文 ↗

摘要：

受LHCb实验的启发，我们在衰变道$B^\pm \to D^+ D^- K^\pm$中对具有四种开夸克味的奇异态$X_{0,1}(2900)$的$D^- K^+$不变质量分布进行了观测，研究了开粲四夸克的光谱和衰变性质.利用两体色磁相互作用，我们发现这两个新观测到的态可以分别解释为$J^P=0^+$的径向激发四夸克态和$J^P=1^-$的轨道激发四夸克态.然后我们研究了由$su \bar d \bar c$和$ d s \bar u \bar c$组成的其他味开四夸克的质量和衰变，它们在味SU（3）群的$\bar 6$或$15$表示中。我们指出这两个态可以通过衰变找到：$X^{(\prime)}_{d s \bar{u}\bar{c}}\to (D^- K^-, D_s^- π^-) $和$X^{(\prime)}_{s u \bar{d}\bar{c}}\to D_s^-π^+ $。我们也将我们的分析应用到开底四夸克$X_b$，并预测它们的质量。$X_b$可以通过以下衰变发现：$X_{ud\bar s\bar{b}}\to B^0K^+$、$X^{(\prime)}_{d s \bar{u}\bar{b}}\to (B^0 K^-, B_s^0 π^-) $和$X^{(\prime)}_{s u \bar{d}\bar{b}}\to B_s^0π^+ $。

英文摘要：

Motivated by the LHCb observation of exotic states $X_{0,1}(2900)$ with four open quark flavors in the $D^- K^+$ invariant mass distribution in the decay channel $B^\pm \to D^+ D^- K^\pm$, we study the spectrum and decay properties of the open charm tetraquarks. Using the two-body chromomagnetic interactions, we find that the two newly observed states can be interpreted as a radial excited tetraquark with $J^P=0^+$ and an orbitally excited tetraquark with $J^P=1^-$, respectively. We then explore the mass and decays of the other flavor-open tetraquarks made of $su \bar d \bar c$ and $ d s \bar u \bar c$, which are in the $\bar 6$ or $15$ representation of the flavor SU(3) group. We point that these two states can be found through the decays: $X^{(\prime)}_{d s \bar{u}\bar{c}}\to (D^- K^-, D_s^- π^-) $, and $X^{(\prime)}_{s u \bar{d}\bar{c}}\to D_s^-π^+ $. We also apply our analysis to open bottom tetraquark $X_b$ and predict their masses. The open-flavored $X_b$ can be discovered through the following decays: $X_{ud\bar s\bar{b}}\to B^0K^+$, $X^{(\prime)}_{d s \bar{u}\bar{b}}\to (B^0 K^-, B_s^0 π^-) $, and $X^{(\prime)}_{s u \bar{d}\bar{b}}\to B_s^0π^+ $.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

↑