Predicting the D‾s(*)Ds(*) bound states as the partners of X(3872)
TL;DR: In this article, the SU(3) flavor symmetry, heavy quark spin symmetry and their breaking effects in the di-meson systems were investigated, and the existence of the [ D ǫ s ∗ D s∗ ] 0 + +, [ Dǫ S ∗D s / D Ã s D s ∫ ] 1 + -, and [ D ‾ s √ D s − √ ] 1+ - bound states were proved.
Abstract: In this work, we investigate the SU(3) flavor symmetry, heavy quark spin symmetry and their breaking effects in the di-meson systems. We prove the existence of the [ D ‾ s ∗ D s ∗ ] 0 + + , [ D ‾ s ∗ D s / D ‾ s D s ∗ ] 1 + - , and [ D ‾ s ∗ D s ∗ ] 1 + - bound states as the consequence of two prerequisites in the SU(3) flavor symmetry and heavy quark spin symmetry. The first prerequisite, the X ( 3872 ) as the weakly D ‾ ∗ D / D ‾ D ∗ bound state is supported by its mass and decay branching ratios. The second prerequisite, the existence of the [ D ‾ s D s ] 0 + + bound state is supported by the lattice QCD calculation and the observation of χ c 0 ( 3930 ) by the LHCb Collaboration. We hope the future experimental analyses can search for these bound states in the B → D ( s ) ( * ) D ‾ ( s ) ( * ) h processes (h denotes the light hadrons). The [ D ‾ s ∗ D s ∗ ] 0 + + bound state is also expected to be reconstructed in the J / ψ ϕ final state in the B → J / ψ ϕ K decay.
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TL;DR: In this paper, the authors investigated the kinetically allowed strong and radiative decay width in the single channel limit and isospin singlet limit of the tetraquark state.
Abstract: Very recently, the LHCb Collaboration reported the doubly charmed tetraquark state ${T}_{cc}^{+}$ below the ${D}^{*+}{D}^{0}$ threshold about 273 keV. As a very near-threshold state, its long-distance structure is very important. In the molecular scheme, we relate the coupling constants of ${T}_{cc}^{+}$ with ${D}^{*0}{D}^{+}$ and ${D}^{*+}{D}^{0}$ to its binding energy and mixing angle of two components with a coupled-channel effective field theory. With the coupling constants, we investigate the kinetically allowed strong decays ${T}_{cc}^{+}\ensuremath{\rightarrow}{D}^{0}{D}^{0}{\ensuremath{\pi}}^{+}$, ${T}_{cc}^{+}\ensuremath{\rightarrow}{D}^{+}{D}^{0}{\ensuremath{\pi}}^{0}$ and radiative decays ${D}^{+}{D}^{0}\ensuremath{\gamma}$. Our results show that the decay width of ${T}_{cc}^{+}\ensuremath{\rightarrow}{D}^{0}{D}^{0}{\ensuremath{\pi}}^{+}$ is the largest one, which is just the experimental observation channel. Our theoretical total strong and radiative widths are in favor of the ${T}_{cc}^{+}$ as a $|{D}^{*+}{D}^{0}⟩$ dominated bound state. The total strong and radiative width in the single channel limit and isospin singlet limit are given as ${59.7}_{\ensuremath{-}4.4}^{+4.6}\text{ }\text{ }\mathrm{keV}$ and ${46.7}_{\ensuremath{-}2.9}^{+2.7}\text{ }\text{ }\mathrm{keV}$, respectively. Our calculation is cutoff-independent and without prior isospin assignment. The absolute partial widths and ratios of the different decay channels can be used to test the structure of ${T}_{cc}^{+}$ state when the updated experimental results are available.
41 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 extend the dynamical diquark model to encompass such states, using the same values of Hamiltonian parameters previously obtained from the nonstrange and hidden-strange sectors.
Abstract: The observation by BESIII and LHCb of states with hidden charm and open strangeness ($c\overline{c}q\overline{s}$) presents new opportunities for the development of a global model of heavy-quark exotics. Here we extend the dynamical diquark model to encompass such states, using the same values of Hamiltonian parameters previously obtained from the nonstrange and hidden-strange sectors. The large mass splitting between ${Z}_{cs}(4000)$ and ${Z}_{cs}(4220)$ suggests substantial ${\mathrm{SU}(3)}_{\text{flavor}}$ mixing between all ${J}^{P}={1}^{+}$ states, while their average mass compared to that of other sectors offers a direct probe of flavor octet-singlet mixing among exotics. We also explore the inclusion of $\ensuremath{\eta}$-like exchanges within the states, and find their effects to be quite limited. In addition, using the same diquark-mass parameters, we find ${P}_{c}(4312)$ and ${P}_{cs}(4459)$ to fit well as corresponding nonstrange and open-strange pentaquarks.
24 citations
TL;DR: In this paper, the implications of the hidden charm tetraquark states Z cs ( 3985 ) and Z cs( 4000 ) with strangeness were observed by the BESIII and LHCb collaborations, respectively, which are great breakthroughs for exploring exotic quantum chromodynamics structures.
Abstract: Recently, the hidden charm tetraquark states Z cs ( 3985 ) and Z cs ( 4000 ) with strangeness were observed by the BESIII and LHCb collaborations, respectively, which are great breakthroughs for exploring exotic quantum chromodynamics (QCD) structures. The first and foremost question is whether they are the same state. In this work, we explore the implications of the narrower state Z cs ( 3985 ) in BESIII and the wider one Z cs ( 4000 ) in LHCb as two different states. Within a solvable nonrelativistic effective field theory, we include the possible violations of heavy quark spin symmetry and SU(3) flavor symmetry in a comprehensive approach. If Z cs ( 3985 ) and Z cs ( 4000 ) are two different states, our results show that Z cs ( 4000 ) / Z cs ( 3985 ) is the pure ( | D ‾ s ∗ D 〉 + / - | D ‾ s D ∗ 〉 ) / 2 state, and the SU(3) flavor partner of Z c ( 3900 ) is Z cs ( 4000 ) rather than the Z cs ( 3985 ) . Another two important consequences are the existence of a tensor D ‾ s ∗ D ∗ resonance with mass about 4126 MeV and width 13 MeV, and the suppression of the decay mode Z cs ( 3985 ) → J / ψ K . The two consequences can be tested in experiments and distinguish the two-state interpretation from the one-state scheme.
19 citations
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TL;DR: The review as discussed by the authors summarizes much of particle physics and cosmology using data from previous editions, plus 3,283 new measurements from 899 Japers, including the recently discovered Higgs boson, leptons, quarks, mesons and baryons.
Abstract: The Review summarizes much of particle physics and cosmology. Using data from previous editions, plus 3,283 new measurements from 899 Japers, we list, evaluate, and average measured properties of gauge bosons and the recently discovered Higgs boson, leptons, quarks, mesons, and baryons. We summarize searches for hypothetical particles such as heavy neutrinos, supersymmetric and technicolor particles, axions, dark photons, etc. All the particle properties and search limits are listed in Summary Tables. We also give numerous tables, figures, formulae, and reviews of topics such as Supersymmetry, Extra Dimensions, Particle Detectors, Probability, and Statistics. Among the 112 reviews are many that are new or heavily revised including those on: Dark Energy, Higgs Boson Physics, Electroweak Model, Neutrino Cross Section Measurements, Monte Carlo Neutrino Generators, Top Quark, Dark Matter, Dynamical Electroweak Symmetry Breaking, Accelerator Physics of Colliders, High-Energy Collider Parameters, Big Bang Nucleosynthesis, Astrophysical Constants and Cosmological Parameters.
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