Interpretations of the new LHCb $$P_c(4337)^+$$ pentaquark state
Interpretations of the new LHCb $$P_c(4337)^+$$ pentaquark state
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新 LHCb $$P_c(4337)^ $$ 五夸克态的解释
DOI：
10.1140/epjc/s10052-022-10522-7
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发表时间：
2021
影响因子：
4.4
通讯作者：
Manuel Pavon Valderrama
中科院分区：
文献类型：
--
作者：
Mao-Jun Yan;Fang-Zheng Peng;Mario Sánchez Sánchez;Manuel Pavon Valderrama
最近，LHCb合作观察到了一个新的五夸克态，即$P_c(4337)^+$。由于它接近$chi_{c0}(1s)p$、$bar{D}^Lambda_c$、$bar{D}Sigma_c$和$bar{D}Sigma_c^$的阈值，这个新的五夸克很可能是介子-重子束缚态。然而，它的自旋和宇称尚未确定，之前的任何可能性都不能排除。我们简要地探索这些选项中的几个以及它们在本手稿中所引起的后果：(I)$P_c(4337)^+$可以是$chi_{c0}(1s)p$束缚状态，(Ii)$P_c(4312)^和$P_c(4337)^+$可以分别是接近阈值的$bar{D}、Lambda_c$和$bar{D}Sigma_c$状态，其中Breit-Wigner质量可能不对应于极点的位置，(3)$P_c(4312)^+$和$P_c(4337)^+$的位置可以用$bar{D}、Lambda_c$-$bar{D}Sigma_c$和$bar{D}^Lambda_c$-$bar{D}Sigma_c^$耦合的河道动力学来解释。最后一种选择，虽然不是最可能的解释，但仍然潜在地与$P_{cs}(4459)^0$的双峰解以及我们所知的$P_c(4312)^+$相容。作为前人探索的副产品，我们猜想存在一系列反魅力介子-反三重子的魅力重子束缚态，并计算了它们的质量。
Recently the LHCb collaboration has observed a new pentaquark state, the $P_c(4337)^+$. Owing to its proximity to the $chi_{c0}(1S) p$, $bar{D}^ Lambda_c$, $bar{D} Sigma_c$ and $bar{D} Sigma_c^$ thresholds, this new pentaquark might very well be a meson-baryon bound state. However its spin and parity have not been determined yet and none of the previous possibilities can be ruled out. We briefly explore a few of these options and the consequences they entail in the present manuscript: (i) the $P_c(4337)^+$ might be a $chi_{c0}(1S) p$ bound state, (ii) the $P_c(4312)^+$ and $P_c(4337)^+$ might be $bar{D}^ Lambda_c$ and $bar{D} Sigma_c$ states close to threshold, respectively, where the Breit-Wigner mass might not correspond to the location of the poles, (iii) the locations of the $P_c(4312)^+$ and $P_c(4337)^+$ might be explained in terms of the $bar{D}^ Lambda_c$-$bar{D} Sigma_c$ and $bar{D}^ Lambda_c$-$bar{D} Sigma_c^$ coupled channel dynamics. This last option, though not the most probable explanation, is still potentially compatible with the double peak solution of the $P_{cs}(4459)^0$ and with what we know of the $P_c(4312)^+$. As a byproduct of the previous explorations, we conjecture the existence of a series of anticharmed meson - antitriplet charmed baryon bound states and calculate their masses.