论文标题
第一个异国情调的强子具有开放浓烈风味：$ cs \ bar u \ bar d $ tetraquark
First exotic hadron with open heavy flavor: $cs\bar u\bar d$ tetraquark
论文作者
论文摘要
LHCB的合作报告了在频道$ d^+ k^ - $中的共振活动，确定两个组成部分：$ x_0（2900）$，$ j^p = 0^p = 0^+ $ $ j^p = 0^+ $ at $ 2866 {\ pm} 7 $ mev，$γ_0= 57 = 57 = 57 = 57 {\ pm} 13 $ mev and $ x_1（$ x_1（$ x_1（2900）） {\ pm} 7 $ MEV，$γ_1= 110 {\ pm} 12 $ MEV。我们将$ x_0（2900）$组件解释为$ cs \ bar u \ bar d $ isosinglet compact tetraquark，将其质量计算为$ 2863 {\ pm} 12 $ mev。这是第一个具有开放浓烈风味的异国情调的强子。类似的$ bs \ bar u \ bar d $ tetraquark的预计为$ 6213 {\ pm} 12 $ mev。我们讨论对较重和更宽的$ x_1（2900）$状态的可能解释，并检查对具有两个重夸克的其他系统的潜在影响。
The LHCb Collaboration has reported resonant activity in the channel $D^+ K^-$, identifying two components: $X_0(2900)$ with $J^P = 0^+$ at $2866 {\pm} 7$ MeV, $Γ_0=57{\pm} 13$ MeV and $X_1(2900)$ with $J^P = 1^-$ at $2904 {\pm} 7$ MeV, $Γ_1=110{\pm} 12$ MeV. We interpret the $X_0(2900)$ component as a $cs \bar u\bar d$ isosinglet compact tetraquark, calculating its mass to be $2863 {\pm} 12$ MeV. This is the first exotic hadron with open heavy flavor. The analogous $bs\bar u\bar d$ tetraquark is predicted at $6213 {\pm} 12$ MeV. We discuss possible interpretations of the heavier and wider $X_1(2900)$ state and examine potential implications for other systems with two heavy quarks.
