Evidence supporting the existence of $P_c(4380{)}^{\pm }$ from the recent measurements of $B_s\to J/\psi p\bar{p}$

Abstract

Very recently, the LHCb collaboration released the newest measurements of $B_s\to J/\psi p\bar{p}$, where an enhancement structure near 4.34 GeV was observed in the invariant mass spectrum of $J/\psi p$ with the statistical significance of $3.1-3.7$ $\sigma$. In this work, by performing a combined analysis for the three invariant mass spectra of $B_s\to J/\psi p\bar{p}$, we find that this $J/\psi p$ structure near 4.34 GeV can correspond to the contributions from the $P_c(4380{)}^{+}$ state with the assumption of $J^P=3/2^{-}$ together with the reflections of $B_s\to (f_2^{\ast }\to p\bar{p})J/\psi$. Here, $P_c(4380)$ was first observed in ${\Lambda }_b\to J/\psi pK$ but not confirmed in the updated LHCb data in 2019, and $f_2^{\ast }$ means the exciting light isoscalar tensor meson around 2.0 GeV. Thus, this provides a possible evidence to support the existence of the pentaquark $P_c(4380)$. Specifically, the assumed spin parity $J^P=3/2^{-}$ of $P_c(4380)$ is consistent with a prediction of the theoretical explanation of an $S$-wave $\bar{D}{\Sigma }_c^{\ast }$ molecular bound state.

8 pages, 2 tables and 3 figures, accepted by Physical Review D

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• Pentaquark and Tetraquark states
• Observation of a narrow pentaquark state, $P_c(4312{)}^{+}$, and of two-peak structure of the $P_c(4450{)}^{+}$
• Observation of a resonance-like structure in the pi^+- psi' mass distribution in exclusive B-->K pi^+- psi' decays
• Prediction of narrow $N^{\ast }$ and ${\Lambda }^{\ast }$ resonances with hidden charm above 4 GeV
• Emergence of a complete heavy-quark spin symmetry multiplet: seven molecular pentaquarks in light of the latest LHCb analysis
• Strong LHCb evidence supporting the existence of the hidden-charm molecular pentaquarks
• Observation of new resonances decaying to $J/\psi K^{+}$ and $J/\psi \varphi$
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• Heavy quark spin symmetric molecular states from ${\bar{D}}^{(\ast )}{\Sigma }_c^{(\ast )}$ and other coupled channels in the light of the recent LHCb pentaquarks
• Interpretation of the LHCb $P_c$ States as Hadronic Molecules and Hints of a Narrow $P_c(4380)$
• Hidden-charm and hidden-bottom molecular pentaquarks in chiral perturbation theory
• Revisiting the nature of the $P_c$ pentaquarks
• The mass spectrum and strong decays of isoscalar tensor mesons
• How to reveal the nature of three or more pentaquark states?
• Toward charged $Z_{cs}(3985)$ structure under a reflection mechanism
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• Holographic charm and bottom pentaquarks III: Excitations through photo-production of heavy mesons
• Production of the charmoniumlike state $Y(4220)$ through the $p\bar{p}\to Y(4220){\pi }^0$ reaction

Cited by in corpus (6)

• Chiral perturbation theory for heavy hadrons and chiral effective field theory for heavy hadronic molecules
• Fully-charm and -bottom pentaquarks in a Lattice-QCD inspired quark model
• Connection between near the $D_s^{+}{D}_s^{-}$ threshold enhancement in $B^{+}\to D_s^{+}{D}_s^{-}{K}^{+}$ and conventional charmonium ${\chi }_{c0}(2P)$
• Towards modeling the short-range interactions of hidden/open charm pentaquark molecular states
• Strong decays of $a_0$, $f_0$, $f_2$, and $K_2^{\ast }$ resonances as dynamically generated states of two vector mesons
• Exotic Heavy Hadrons