论文标题
轻和夸克对称以及$ y（4230）$，$ y（4360）$，$ y（4500）$，$ y（4620）$和$ x（4630）$共振
Light- and heavy-quark symmetries and the $Y(4230)$, $Y(4360)$, $Y(4500)$, $Y(4620)$ and $X(4630)$ resonances
论文作者
论文摘要
重型强子频谱受对称性的约束，其中两个最重要的是夸克自旋和su（3） - 味道对称性。在这里，我们认为在分子图片中，$ y（4230）$（或$ y（4260）$），$ y（4360）$以及最近发现的$ y（4500）$和$ y（4620）$ y（4620）$ vector的共振，这两个符号与这两个符号链接。通过为$ d \ bar {d} _1 $和$ d_s \ bar {d} _ {s1} $ s-和p-wave Charmed Charmed Charmed Meson-Antimeson Systems的nater $ d \ bar {d} _1 $和$ d_s \ bar {d} _1 $和$ d_s \ bar {d} _1 $和$ d_s \ bar {d} _1 $和$ d_s \ bar {d} \ bar {d} _1 $具有类似于$ y（4360）$，$ d_s \ bar {d} _ {s1} $的质量的伴侣，其质量接近$ y（4500）$和三个$ j = 1,2 $ d_s^* $ d_s^* bar {d} d_ v \ bar {d} \ bar {d} _ {s2}^{*} $绑定状态，质量为$ 4630 \，{\ rm mev} $，其中第一个（$ j = 1 $）可能与$ y（4620）$相对应。通过修改我们用来构建有效的现场理论的假设，可以改善先前的预测。特别是，如果我们考虑$ d^* \ bar {d} _1 $ - $ d^* \ bar {d} _2^* $和$ d_s^* \ bar {d} _ {s1} _ {s1} $ - $ d_s^* \ bar {d} _ \ bar {d} _ {d} _ {s2} _ { $ j = 2 $阳性C-Parity状态，质量约为$ 4650 \，{\ rm mev} $。 LHCB过去一年中发现的$ X（4630）$可能会在$ j/ψϕ $不变质量分布中发现的$ x（4630）$来识别这种隐藏的trange和隐藏状态。
The heavy hadron spectrum is constrained by symmetries, of which two of the most important ones are heavy-quark spin and SU(3)-flavor symmetries. Here we argue that in the molecular picture the $Y(4230)$ (or $Y(4260)$), the $Y(4360)$ and the recently discovered $Y(4500)$ and $Y(4620)$ vector-like resonances are linked by these two symmetries. By formulating a contact-range effective field theory for the $D \bar{D}_1$ and $D_s \bar{D}_{s1}$ family of S- and P-wave charmed meson-antimeson systems, we find that if the $Y(4230)$ were to be a pure $D \bar{D}_1$ molecular state, there would be a $D^* \bar{D}_1$ partner with a mass similar to the $Y(4360)$, a $D_s \bar{D}_{s1}$ partner with a mass close to the $Y(4500)$ and three $J=1,2$ $D_s^* \bar{D}_{s1}$ and $J=3$ $D_s^* \bar{D}_{s2}^{*}$ bound states with a mass in the vicinity of $4630\,{\rm MeV}$, of which the first one ($J=1$) might correspond with the $Y(4620)$. The previous predictions can in turn be improved by modifying the assumptions we have used to build the effective field theory. In particular, if we consider the closeness of the $D^* \bar{D}_1$-$D^* \bar{D}_2^*$ and $D_s^* \bar{D}_{s1}$-$D_s^* \bar{D}_{s2}^*$ thresholds and include the related coupled channel dynamics, we predict a $J=2$ positive C-parity state with a mass around $4650\,{\rm MeV}$. This hidden-strange and hidden-charm state might in turn be identified with the $X(4630)$ that has been discovered past year by the LHCb in the $J/ψϕ$ invariant mass distribution.
