论文标题
探索SU（4）风味模型中隐藏魅力奇怪的pentaquark的频谱
Exploring the spectrum of the hidden charm strange pentaquark in an SU(4) flavor-spin model
论文作者
论文摘要
We study the spectrum of the isoscalar pentaquark $udsc\overline{c}$, of either positive or negative parity, in a constituent quark model with linear confinement and a flavor-spin hyperfine interaction previously extended to SU(4) and used to describe the spectrum of the $uudc\overline{c}$ pentaquarks observed at LHCb in 2019. For positive parity我们在一个单位动量位于四个夸克子系统中的一个单位动量和角动量位于基态四个夸克子系统和古quark之间的相对运动中的情况下进行区分。新颖的是，由于精确的SU（4） - 汉密尔顿模型的含有味道对称性，我们引入了不同风味状态之间的耦合，无论是正式和负平等状态。一个重要的结果是，位于4404 MEV的最低状态具有量子数$ j^p $ = $ 1/2^ - $，而没有耦合最低状态的$ j^p $ = $ 1/2^+$或$ 3/2^+$。
We study the spectrum of the isoscalar pentaquark $udsc\overline{c}$, of either positive or negative parity, in a constituent quark model with linear confinement and a flavor-spin hyperfine interaction previously extended to SU(4) and used to describe the spectrum of the $uudc\overline{c}$ pentaquarks observed at LHCb in 2019. For positive parity we make a distinction between the case where one unit of angular momentum is located in the subsystem of four quarks and the case where the angular momentum is located in the relative motion between a ground state four-quark subsystem and the antiquark. The novelty is that we introduce the coupling between different flavor states, due to the breaking of exact SU(4)-flavor symmetry of the Hamiltonian model, both for positive and negative parity states. An important consequence is that the lowest state, located at 4404 MeV, has quantum numbers $J^P$ = $1/2^-$ while without coupling the lowest state has $J^P$ = $1/2^+$ or $3/2^+$.
