$P_{cs}(4459)$ and other possible molecular states from $\Xi_{c}^{(*)}\bar{D}^{(*)}$ and $\Xi'_c\bar{D}^{(*)}$ interactions
TL;DR: In this article, a coupled-channel study of the Ξc*D¯*, ξc′D¯, Ξ c *D¯, ΞC*D´¯, ǫ-D´ǫD'ǫ, and Ã-D¯ interactions in the quasipotential Bethe-Salpeter equation approach was performed with the help of light meson exchanges.
Abstract: Recently, the LHCb Collaboration reported a new structure Pcs(4459) with a mass of 19 MeV below the ΞcD¯* threshold It may be a candidate of molecular state from the ΞcD¯* interaction In the current work, we perform a coupled-channel study of the Ξc*D¯*, Ξc′D¯*, Ξc*D¯, ΞcD¯*, Ξc′D¯, and ΞcD¯ interactions in the quasipotential Bethe-Salpeter equation approach With the help of the heavy quark chiral effective Lagrangian, the potential is constructed by light meson exchanges Two ΞcD¯* molecular states are produced with spin parities JP=1/2- and 3/2- The lower state with 3/2- can be related to the observed Pcs(4450) while two-peak structure cannot be excluded Within the same model, other strange hidden-charm pentaquarks are also predicted Two states with spin parities 1/2- and a state with 3/2- are predicted near the Ξc′D¯, ΞcD¯, and Ξc*D¯ thresholds, respectively As two states near ΞcD¯* threshold, two states are produced with 1/2- and 3/2- near the Ξc′D¯* threshold The couplings of the molecular states to the considered channels are also discussed The experimental research of those states are helpful to understand the origin and internal structure of the Pcs and Pc states
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TL;DR: In this article , an updated review of the recent experimental and theoretical progresses in the active field of hadron physics has been provided, including the recently observed open heavy flavor tetraquark states X(2900) and Tcc+(3875) as well as the hidden heavy flavor multiquark states.
Abstract: The past decades witnessed the golden era of hadron physics. Many excited open heavy flavor mesons and baryons have been observed since 2017. We shall provide an updated review of the recent experimental and theoretical progresses in this active field. Besides the conventional heavy hadrons, we shall also review the recently observed open heavy flavor tetraquark states X(2900) and Tcc+(3875) as well as the hidden heavy flavor multiquark states X(6900), Pcs(4459)0 , Zcs(3985)− , Zcs(4000)+ , and Zcs(4220)+ . We will also cover the recent progresses on the glueballs and light hybrid mesons, which are the direct manifestations of the non-Abelian SU(3) gauge interaction of the Quantum Chromodynamics in the low-energy region.
109 citations
TL;DR: In this article, a new member of the known hidden-charm pentaquarks, called the $P_{cs}(4459)$ by the LHCb collaboration, was observed.
Abstract: The observation of the $P_{cs}(4459)$ by the LHCb collaboration adds a new member to the set of known hidden-charm pentaquarks, which includes the $P_c(4312)$, $P_c(4440)$ and $P_c(4457)$. The $P_{cs}(4459)$ is expected to have the light-quark content of a $\Lambda$ baryon ($I=0$, $S=-1$), but its spin is unknown. Its closeness to the $\bar{D}^* \Xi_c$ threshold -- $4478\,{\rm MeV}$ in the isospin-symmetric limit -- suggests the molecular hypothesis as a plausible explanation for the $P_{cs}(4459)$. While in the absence of coupled-channel dynamics heavy-quark spin symmetry predicts the two spin-states of the $\bar{D}^* \Xi_c$ to be degenerate, power counting arguments indicate that the coupling with the nearby $\bar{D} \Xi_c'$ and $\bar{D} \Xi_c^*$ channels might be a leading order effect. This generates a hyperfine splitting in which the $J=\tfrac{3}{2}$ $\bar{D}^* \Xi_c$ pentaquark will be lighter than the $J=\tfrac{1}{2}$ configuration, which we estimate to be of the order of $5-15\,{\rm MeV}$. We also point out an accidental symmetry between the $P_{cs}(4459)$ and $P_c(4440/4457)$ potentials. Finally, we argue that the spectroscopy and the $J/\psi \Lambda$ decays of the $P_{cs}(4459)$ might suggest a marginal preference for $J = \tfrac{3}{2}$ over $J = \tfrac{1}{2}$.
40 citations
TL;DR: In this paper, the LHCb observation of the hidden-charm pentaquarks was used to add a new member to the set of known hidden-chant pentaquark, which includes the $$P_c(4312)$$�, $$P-c(4440/4457)$$Buyable potentials.
Abstract: The observation of the $$P_{cs}(4459)$$
by the LHCb collaboration adds a new member to the set of known hidden-charm pentaquarks, which includes the $$P_c(4312)$$
, $$P_c(4440)$$
and $$P_c(4457)$$
. The $$P_{cs}(4459)$$
is expected to have the light-quark content of a $$\Lambda $$
baryon (
$$I=0$$
, $$S=-1$$
), but its spin is unknown. Its closeness to the $${\bar{D}}^* \Xi _c$$
threshold – $$4478\,{\mathrm{MeV}}$$
in the isospin-symmetric limit – suggests the molecular hypothesis as a plausible explanation for the $$P_{cs}(4459)$$
. While in the absence of coupled-channel dynamics heavy-quark spin symmetry predicts the two spin-states of the $${\bar{D}}^* \Xi _c$$
to be degenerate, power counting arguments indicate that the coupling with the nearby $${\bar{D}} \Xi _c'$$
and $${\bar{D}} \Xi _c^*$$
channels might be a leading order effect. This generates a hyperfine splitting in which the $$J=\tfrac{3}{2}$$
$${\bar{D}}^* \Xi _c$$
pentaquark will be lighter than the $$J=\tfrac{1}{2}$$
configuration, which we estimate to be of the order of $$5-15\,{\mathrm{MeV}}$$
. We also point out an accidental symmetry between the $$P_{cs}(4459)$$
and $$P_c(4440/4457)$$
potentials. Finally, we argue that the spectroscopy and the $$J/\psi \Lambda $$
decays of the $$P_{cs}(4459)$$
might suggest a marginal preference for $$J = \tfrac{3}{2}$$
over $$J = \tfrac{1}{2}$$
.
37 citations
TL;DR: In this paper , an extensive review of the progress on the heavy hadronic molecular states within the framework of the chiral perturbation theory is presented, in which the same chiral dynamics not only govern the nuclei and forms the deuteron, but also dictates the shallow bound states or resonances composed of two heavy hadrons.
26 citations
TL;DR: In this paper, the authors employed the light-cone QCD sum rule to calculate the magnetic dipole moments of the pentaquark states by considering them as the diquark-diquark antiquark and molecular pictures with quantum numbers.
Abstract: In this work, we employ the light-cone QCD sum rule to calculate the magnetic dipole moments of the $$P_c(4440)$$
, $$P_c(4457)$$
and $$P_{cs}(4459)$$
pentaquark states by considering them as the diquark–diquark–antiquark and molecular pictures with quantum numbers $$J^P = \frac{3}{2}^-$$
, $$J^P = \frac{1}{2}^-$$
and $$J^P = \frac{1}{2}^-$$
, respectively. In the analyses, we use the diquark–diquark–antiquark and molecular form of interpolating currents, and photon distribution amplitudes to obtain the magnetic dipole moment of pentaquark states. Theoretical examinations on magnetic dipole moments of the hidden-charm pentaquark states, are essential as their results can help us better figure out their substructure and the dynamics of the QCD as the theory of the strong interaction. As a by product, we extract the electric quadrupole and magnetic octupole moments of the $$P_c(4440)$$
pentaquark. These values show a non-spherical charge distribution.
23 citations
References
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6,464 citations
TL;DR: In this article, the pentaquark-charmonium states were observed in the J/ψp channel in Λ0b→J/K−p decays and the significance of these resonances is more than 9 standard deviations.
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847 citations
TL;DR: In this article, a relativistic chiral unitary approach based on coupled channels was proposed to perform the necessary resummation of the lowest order chiral Lagrangian.
693 citations
TL;DR: In this article, an effective chiral lagrangian for heavy and light mesons describing strong interactions among effective meson fields as well as their couplings to electromagnetic and weak currents, including the relevant symmetry-breaking terms is presented.
517 citations
TL;DR: An effective Lagrangian that describes the low-momentum interactions of mesons containing a heavy quark with the pseudo Goldstone bosons and $\ensuremath{\eta}$ is constructed, invariant under both heavy-quark spin symmetry and chiral symmetry.
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511 citations