论文标题
$ x_0（2900）$及其在分子图片中的重夸克旋转伙伴
The $X_0(2900)$ and its heavy quark spin partners in molecular picture
论文作者
论文摘要
$ x_0（2900）$最近在$ d^-k^+$ $ b^+\ to d^+d^-k^+$过程中观察到的$ d^-k^+$不变质量是第一个具有四种不同口味的外来候选者，这为Hadron社区打开了一个新时代。假设$ x_0（2900）$是$ i（j^p）= 0（0^+）$ $ \ bar {d}^*k^*k^*$ hadronic Molecule，我们提取了由$ \ left（\ bar {d}，\ bar {d}，\ bar {d}^$ k^$ k^y $ w y the $ weft形成的整个重型夸克对称倍数。对于约束状态案例，与$ \ bar {d} k^*$和$ \ bar {d}^*k^*$通道以及一个额外的$ i（j^p）= 0（j^p）= 0（2^+）$ \ bar Bar {d $ \ bar {d p}^*$ n c^*$^k^*在光夸克限制中，它们的价格为$ 36.66〜 \ MATHRM {MEV} $和$ 34.22〜 \ MATHRM {MEV} $下方的$ \ bar {d} k^*$和$ \ bar {d}^*k^*k^*$ thresholds，分别由$x_____________________________________________________________。对于虚拟状态案例，将有一个额外的$ i（j^p）= 0（1^+）$ HADRONIC分子与$ \ bar {d} k^*$通道强烈耦合，一个额外的$ i（j^p）= 0（2^+）$ \ bar bar {d}^*k^*k^*k^*$ molecule。搜索这些重型夸克旋转伙伴将有助于阐明$ x_0（2900）$的性质。
The $X_0(2900)$ observed by the LHCb Collaboration recently in the $D^-K^+$ invariant mass of the $B^+\to D^+D^-K^+$ process is the first exotic candidate with four different flavors, which opens a new era for the hadron community. Under the assumption that the $X_0(2900)$ is a $I(J^P)=0(0^+)$ $\bar{D}^*K^*$ hadronic molecule, we extract the whole heavy-quark symmetry multiplet formed by the $\left(\bar{D},\bar{D}^*\right)$ doublet and the $K^*$ meson. For the bound state case, there would be two additional $I(J^P)=0(1^+)$ hadronic molecules associated with the $\bar{D}K^*$ and $\bar{D}^*K^*$ channels as well as one additional $I(J^P)=0(2^+)$ $\bar{D}^*K^*$ molecule. In the light quark limit, they are $36.66~\mathrm{MeV}$ and $34.22~\mathrm{MeV}$ below the $\bar{D}K^*$ and $\bar{D}^*K^*$ thresholds, respectively, which are unambiguously fixed by the mass position of the $X_0(2900)$. For the virtual state case, there would be one additional $I(J^P)=0(1^+)$ hadronic molecule strongly coupling to the $\bar{D}K^*$ channel and one additional $I(J^P)=0(2^+)$ $\bar{D}^*K^*$ molecule. Searching for these heavy quark spin partners will help shed light on the nature of the $X_0(2900)$.
