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Observation of a narrow pentaquark state, $P_c(4312)^+$, and of two-peak structure of the $P_c(4450)^+$

The LHCb collaboration
Aaij, Roel , Abellán Beteta, Carlos , Adeva, Bernardo , Adinolfi, Marco , Aidala, Christine Angela , Ajaltouni, Ziad , Akar, Simon , Albicocco, Pietro , Albrecht, Johannes , Alessio, Federico
Phys.Rev.Lett. 122 (2019) 222001, 2019.
https://doi.org/10.17182/hepdata.89271

Abstract
A narrow pentaquark state, $P_c(4312)^+$, decaying to $J/\psi p$ is discovered with a statistical significance of $7.3\sigma$ in a data sample of ${\Lambda_b^0\to J/\psi p K^-}$ decays which is an order of magnitude larger than that previously analyzed by the LHCb collaboration. The $P_c(4450)^+$ pentaquark structure formerly reported by LHCb is confirmed and observed to consist of two narrow overlapping peaks, $P_c(4440)^+$ and $P_c(4457)^+$, where the statistical significance of this two-peak interpretation is $5.4\sigma$. Proximity of the $\Sigma_c^+\bar{D}^{0}$ and $\Sigma_c^+\bar{D}^{*0}$ thresholds to the observed narrow peaks suggests that they play an important role in the dynamics of these states.

  • Table 1

    Fig. 1; supplementary material Fig. CDS3a

    10.17182/hepdata.89271.v1/t1

    Distribution of $(J/\psi p)$ system invariant mass from the decay of $\Lambda_{b}^{0}$ candidates in the channel $\Lambda_{b}^{0} \to J/\psi p...

  • Table 2

    Fig. 3; supplementary material Fig. CDS3b

    10.17182/hepdata.89271.v1/t2

    Distribution of $(J/\psi p)$ system invariant mass from the decay of $\Lambda_{b}^{0}$ candidates in the channel $\Lambda_{b}^{0} \to J/\psi p...

  • Table 3

    Fig. 6; supplementary material Fig. CDS3c

    10.17182/hepdata.89271.v1/t3

    $\cos \theta_{P_c}$-weighted ditribution of $(J/\psi p)$ system invariant mass from the decay of $\Lambda_{b}^{0}$ candidates in the channel $\Lambda_{b}^{0} \to...

  • Table 4

    Fig. 4; supplementary material Fig. CDS5

    10.17182/hepdata.89271.v1/t4

    Spline interpolation of the weight function (depending of $\cos \theta_{P_c}$) applied to $\Lambda_{b}^{0}$ candidates. The weight function is determined as...

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