Interpretations of the new LHCb $P_c(4337{)}^{+}$ pentaquark state

Abstract

Recently the LHCb collaboration has observed a new pentaquark state, the $P_c(4337{)}^{+}$. Owing to its proximity to the ${\chi }_{c0}(1S)p$, ${\bar{D}}^{\ast }{\Lambda }_c$, $\bar{D}{\Sigma }_c$ and $\bar{D}{\Sigma }_c^{\ast }$ 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 ${\bar{D}}^{\ast }{\Lambda }_c$ 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 ${\bar{D}}^{\ast }{\Lambda }_c$-$\bar{D}{\Sigma }_c$ and ${\bar{D}}^{\ast }{\Lambda }_c$-$\bar{D}{\Sigma }_c^{\ast }$ 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.

19 pages, 5 tables, 1 figure, corresponds with published version

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Cited by in corpus (13)

• Chiral perturbation theory for heavy hadrons and chiral effective field theory for heavy hadronic molecules
• The LHCb state $P_{\psi s}^{\Lambda }(4338)$ as a triangle singularity
• Hidden-charm pentaquark states in a mass splitting model
• Masses and magnetic moments of exotic fully heavy pentaquarks
• Search for hidden-charm pentaquark states in three-body final states
• Evidence supporting the existence of $P_c(4380{)}^{\pm }$ from the recent measurements of $B_s\to J/\psi p\bar{p}$
• On the possibility of testing the two-peak structure of the LHCb hidden-charm strange pentaquark $P_{cs}(4459{)}^0$ in near-threshold antikaon-induced charmonium production on protons and nuclei
• Investigation of a candidate spin-$\frac{1}{2}$ hidden-charm triple strange pentaquark state $P_{csss}$
• Molecular $P_{\psi }$ pentaquarks from light-meson exchange saturation
• Analysis of the hidden-charm pentaquark candidates in the $J/\psi \Xi$ mass spectrum via the QCD sum rules
• Hidden charm ${\mathcal{P}}_{cs}(4338{)}^0$ production in baryonic $B^{-}\to J/\psi \Lambda \bar{p}$ decay
• Low-energy $N\varphi$ scattering from a pole-enhanced triangle diagram
• Decoding the near-threshold $X_{0,1}(4140)$ and $X_1(4685)$ states via OZI-suppressed coupled-channel scattering