First exotic hadron with open heavy flavor: $cs\bar{u}\bar{d}$ tetraquark

Abstract

The LHCb Collaboration has reported resonant activity in the channel $D^{+}{K}^{-}$, identifying two components: $X_0(2900)$ with $J^P=0^{+}$ at $2866\pm 7$ MeV, ${\Gamma }_0=57\pm 13$ MeV and $X_1(2900)$ with $J^P=1^{-}$ at $2904\pm 7$ MeV, ${\Gamma }_1=110\pm 12$ MeV. We interpret the $X_0(2900)$ component as a $cs\bar{u}\bar{d}$ isosinglet compact tetraquark, calculating its mass to be $2863\pm 12$ MeV. This is the first exotic hadron with open heavy flavor. The analogous $bs\bar{u}\bar{d}$ tetraquark is predicted at $6213\pm 12$ MeV. We discuss possible interpretations of the heavier and wider $X_1(2900)$ state and examine potential implications for other systems with two heavy quarks.

4 pages, 1 figure; some additional physics comments; added references

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Cited by in corpus (47)

• An updated review of the new hadron states
• Tetra- and penta-quark structures in the constituent quark model
• Interpretation of structure in the di-$J/\psi$ spectrum
• Discovery potentials of double-charm tetraquarks
• Hadronic molecules in B decays
• Triangle singularity as the origin of $X_0(2900)$ and $X_1(2900)$ observed in $B^{+}\to D^{+}{D}^{-}{K}^{+}$
• Masses and magnetic moments of hadrons with one and two open heavy quarks: heavy baryons and tetraquarks
• A study of the decays of $S-$wave ${\bar{D}}^{\ast }{K}^{\ast }$ hadronic molecules: the scalar $X_0(2900)$ and its spin partners $X_{J(J=1,2)}$
• $X_{0,1}$(2900) and $(D^{-}{K}^{+})$ invariant mass from QCD Laplace sum rules at NLO
• Mass spectrum and strong decays of tetraquark $\bar{c}\bar{s}qq$ states
• An open charm tetraquark candidate: note on $X_0(2900)$
• How to understand the $X(2900)$?
• Discriminating among interpretations for the $X(2900)$ states
• Spectroscopy behavior of fully heavy tetraquarks
• The $\mathbf{sQ}\bar{\mathbf{q}}\bar{\mathbf{q}}$ $(\mathbf{q}=\mathbf{u},\mathbf{d};\mathbf{Q}=\mathbf{c},\mathbf{b})$ tetraquarks in the chiral quark model
• Tetraquarks with open charm favor
• Charmed-strange tetraquarks and their decays in a potential quark model
• On the structures of new scalar resonances $T_{cs0}^a(2900{)}^{++}$ and $T_{cs0}^a(2900{)}^0$
• Vector resonance $X_1(2900)$ and its structure
• The decays of the fully open flavor state $T_{c\bar{s}0}^0$ in a $D^{\ast }{K}^{\ast }$ molecule scenario
• $X_J(2900)$ states in a hot hadronic medium
• Modeling the resonance $T_{cs0}^a(2900{)}^{++}$ as a hadronic molecule $D^{\ast +}{K}^{\ast +}$
• Spectrum of the molecular tetraquarks: Unraveling the $T_{cs0}(2900)$ and $T_{c\bar{s}0}^a(2900)$
• Color flux-tube nature of the states $T_{cs}(2900)$ and $T_{c\bar{s}}^a(2900)$
• Analysis of the $T_{c\bar{s}}(2900)$ and related tetraquark states with the QCD sum rules
• X(2900) in a chiral quark model
• Unified description of the $Qs\bar{q}\bar{q}$ molecular bound states, molecular resonances and compact tetraquark states in the quark potential model
• Prediction of possible $D{K}_1$ bound states
• The roles of the $T_{c\bar{s}0}(2900{)}^0$ and $D_0^{\ast }(2300)$ in the process $B^{-}\to D_s^{+}{K}^{-}{\pi }^{-}$
• Magnetic moment of the $X_1(2900)$ state in the diquark-antidiquark picture
• Studying the ${\bar{D}}_{1}K$ molecule in the Bethe-Salpeter equation approach
• Looking for the exotic $X_0(2866)$ and its $J^P=1^{+}$ partner in the ${\bar{B}}^0\to D^{(\ast )+}{K}^{-}{K}^{(\ast )0}$ reactions
• Molecular states of $D^{\ast }{D}^{\ast }{\bar{K}}^{\ast }$ nature
• Searching for $X_0(2900)$ and $X_1(2900)$ through the kaon induced reactions
• Method to observe the $J^P=2^{+}$ partner of the $X_0(2866)$ in the $B^{+}\to D^{+}{D}^{-}{K}^{+}$ reaction
• Is the resonance $X_0(2900)$ a ground-state or radially excited scalar tetraquark $[ud][\overline{c}\overline{s}]$?
• New $X_{0,1}(2900)$-like exotic states in $b$-baryon decays
• Unwinding the rare $\Omega$ sector: Fragmentation of fully charmed baryons from HL-LHC to FCC
• Substructure of Multiquark Hadrons (Snowmass 2021 White Paper)
• Charge asymmetry in decays $B\to D\bar{D}K$
• Double pole structures of $X_1(2900)$ as the $P$-wave ${\bar{D}}^{\ast }{K}^{\ast }$ resonances
• Observation of the open-charm tetraquark candidate $T_{cs0}^{\ast }(2870{)}^0$ in the $B^{-}\to D^{-}{D}^0{K}_{\mathrm{S}}^0$ decay
• Axial-vector and pseudoscalar tetraquarks $[ud][\bar{c}\bar{s}]$
• Triply Heavy $\Omega$ Baryons with JETHAD: A High-Energy Viewpoint
• $D_1(2420)$ and its interactions with a kaon: open charm states with strangeness
• Exotic hadrons associated with $b$-quark
• Investigation of $T_{cs0}^{\ast }(2870{)}^0$ in $pp$ collisions at $\sqrt{s}$ = 7 TeV with the PACIAE model