Observation of the open-charm tetraquark candidate $T_{cs0}^{\ast }(2870{)}^0$ in the $B^{-}\to D^{-}{D}^0{K}_{\mathrm{S}}^0$ decay

Abstract

An amplitude analysis of $B^{-}\to D^{-}{D}^0{K}_{\mathrm{S}}^0$ decays is performed using proton-proton collision data, corresponding to an integrated luminosity of $9{\text{fb}}^{-1}$, collected with the LHCb detector at center-of-mass energies of 7, 8, and 13$\mathrm{Te}\mathrm{V}$. A resonant structure of spin-parity $0^{+}$ is observed in the $D^0{K}_{\mathrm{S}}^0$ invariant-mass spectrum with a significance of $5.3\sigma$. The mass and width of the state, modeled with a Breit$-$Wigner lineshape, are determined to be $2883\pm 11\pm 8\mathrm{Me}\mathrm{V}/c^2$ and $87_{-47}^{+22}\pm 17\mathrm{Me}\mathrm{V}$ respectively, where the first uncertainties are statistical and the second systematic. These properties and the quark content are consistent with those of the open-charm tetraquark candidate $T_{cs0}^{\ast }(2870{)}^0$ observed previously in the $D^{+}{K}^{-}$ final state of the $B^{-}\to D^{-}{D}^{+}{K}^{-}$ decay. This result confirms the existence of the $T_{cs0}^{\ast }(2870{)}^0$ state in a new decay mode. The $T_{cs1}^{\ast }(2900{)}^0$ state, reported in the $B^{-}\to D^{-}{D}^{+}{K}^{-}$ decay, is also searched for in the $D^0{K}_{\mathrm{S}}^0$ invariant-mass spectrum of the $B^{-}\to D^{-}{D}^0{K}_{\mathrm{S}}^0$ decay, without finding evidence for it.

All figures and tables, along with machine-readable versions and any supplementary material and information, are available at https://lbfence.cern.ch/alcm/public/analysis/full-details/3162/ (LHCb public pages)

References in corpus (34)

• Pentaquark and Tetraquark states
• Observation of a narrow pentaquark state, $P_c(4312{)}^{+}$, and of two-peak structure of the $P_c(4450{)}^{+}$
• An updated review of the new hadron states
• Observation of structure in the $J/\psi$-pair mass spectrum
• Observation of an exotic narrow doubly charmed tetraquark
• Study of the doubly charmed tetraquark $T_{cc}^{+}$
• Evidence of a $J/\psi \Lambda$ structure and observation of excited ${\Xi }^{-}$ states in the ${\Xi }_b^{-}\to J/\psi \Lambda K^{-}$ decay
• Amplitude analysis of the $B^{+}\to D^{+}{D}^{-}{K}^{+}$ decay
• Model-independent study of structure in $B^{+}\to D^{+}{D}^{-}{K}^{+}$ decays
• Observation of a $J/\psi \Lambda$ resonance consistent with a strange pentaquark candidate in $B^{-}\to J/\psi \Lambda \bar{p}$ decays
• New structures in the J/$\psi$J/$\psi$ mass spectrum in proton-proton collisions at $\sqrt{s}$ = 13 TeV
• Evidence for a new structure in the $J/\psi p$ and $J/\psi \bar{p}$ systems in $B_s^0\to J/\psi p\bar{p}$ decays
• Observation of an excess of di-charmonium events in the four-muon final state with the ATLAS detector
• $X_0(2866)$ as a $D^{\ast }{\bar{K}}^{\ast }$ molecular state
• Molecular picture for the $X_0(2866)$ as a $D^{\ast }{\bar{K}}^{\ast }$ $J^P=0^{+}$ state and related $1^{+},2^{+}$ states
• $X_0(2900)$ and $X_1(2900)$: hadronic molecules or compact tetraquarks
• First observation of a doubly charged tetraquark and its neutral partner
• Open-charm tetraquark $X_c$ and open-bottom tetraquark $X_b$
• Analysis of the $X_0(2900)$ as the scalar tetraquark state via the QCD sum rules
• Strong decays of ${\bar{D}}^{\ast }{K}^{\ast }$ molecules and the newly observed $X_{0,1}$ states
• First exotic hadron with open heavy flavor: $cs\bar{u}\bar{d}$ tetraquark
• A study of the decays of $S-$wave ${\bar{D}}^{\ast }{K}^{\ast }$ hadronic molecules: the scalar $X_0(2900)$ and its spin partners $X_{J(J=1,2)}$
• The $X_0(2900)$ and its heavy quark spin partners in molecular picture
• Amplitude analysis of $B^0\to {\overline{D}}^0{D}_s^{+}{\pi }^{-}$ and $B^{+}\to D^{-}{D}_s^{+}{\pi }^{+}$ decays
• Mass spectrum and strong decays of tetraquark $\bar{c}\bar{s}qq$ states
• Heavy-strange meson molecules and possible candidates $D_{s0}^{\ast }(2317)$, $D_{s1}(2460)$, and $X_0(2900)$
• Discriminating among interpretations for the $X(2900)$ states
• 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
• Mass spectra and decays of open-heavy tetraquark states
• Vector resonance $X_1(2900)$ and its structure
• Diagrammatic analysis of hidden- and open-charm tetraquark production in $B$ decays
• Magnetic moment of the $X_1(2900)$ state in the diquark-antidiquark picture
• Covalent hadronic molecules induced by shared light quarks
• First observation of the ${\Lambda }_b^0\to D^{+}{D}^{-}\Lambda$ decay

Cited by in corpus (2)

• 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