Hunting for the heavy quark spin symmetry partner of $Z_{cs}$

Abstract

The discovery of a charged strange hidden-charm state $Z_{cs}$(3985) implies another higher $Z_{cs}^{\ast }$ state coupling to ${\bar{D}}_s^{\ast -}{D}^{\ast 0}+c.c$ under the heavy quark spin symmetry. In this paper we discuss a possible hunt for it with data taken at existing facilities. We point out a hint for $Z_{cs}^{\ast }$ in the data of ${\bar{B}}_s^0\to J/\psi K^{-}{K}^{+}$ at LHCb, though weak, in line with the production mechanism of pentaquark $P_c$. We also study the triangular singularity which would possibly enhance the production of $Z_{cs}^{\ast }$ in electron-positron collision. Surprisingly, the production rate of $Z_{cs}^{\ast }$ is expected to be maximum at the $e^{+}{e}^{-}$ center of mass energy of 4.648 GeV, which is lower than 4.681 GeV for $Z_{cs}$ due to the inverted coupling hierarchy of $D_{s1}\bar{D}K$ and $D_{s2}{\bar{D}}^{\ast }K$ in the triangle diagrams. Their bottom analogue under heavy quark flavor symmetry is also discussed. Our theoretical analysis would confront with future experiment of LHCb, BESIII, and Bell II.

arXiv comment14 pages, 6 figures and 1 table

References in corpus (49)

• Hadronic molecules
• Threshold cusps and triangle singularities in hadronic reactions
• Consequences of Heavy Quark Symmetries for Hadronic Molecules
• A survey of heavy-heavy hadronic molecules
• The Heavy Quark Spin Symmetry Partners of the X(3872)
• Light Flavour and Heavy Quark Spin Symmetry in Heavy Meson Molecules
• Excited heavy tetraquarks with hidden charm
• Effect of charmed meson loops on charmonium transitions
• Explaining the Many Threshold Structures in the Heavy-Quark Hadron Spectrum
• $Z_c(3900)$: what has been really seen?
• Predictions of charged charmonium-like structures with hidden-charm and open-strange channels
• Strange molecular partners of the $Z_c(3900)$ and $Z_c(4020)$
• Hidden-charm and bottom tetra- and pentaquarks with strangeness in the hadro-quarkonium and compact tetraquark models
• $Z_{cs}(3985{)}^{-}$ as the $U$-spin partner of $Z_c(3900{)}^{-}$ and implication of other states in the ${\text{SU(3)}}_F$ symmetry and heavy quark symmetry
• $D_s{D}^{\ast }$ molecule as an axial meson
• About the exotic structure of $Z_{cs}$
• Analysis of the hidden-charm tetraquark molecule mass spectrum with the QCD sum rules
• Hidden charm tetraquark states in a diquark model
• Analysis of the $Z_{cs}(3985)$ as the axialvector tetraquark state
• Confronting pentaquark photoproduction with new LHCb observations
• Decoding the nature of $Z_{cs}(3985)$ and establishing the spectrum of charged heavy quarkoniumlike states in chiral effective field theory
• $Z_{cs}(3985{)}^{-}$: a strange hidden-charm tetraquark resonance or not?
• The strange partner of the $Z_c$ structures in a coupled-channels model
• Bottom Baryon Decays to Pseudoscalar Meson and Pentaquark
• The $Z_{cs}(3985)$ as a threshold effect from the ${\bar{D}}_s^{\ast }D+{\bar{D}}_s{D}^{\ast }$ interaction
• Predicition for the decay width of a charged state near the $D_s{\bar{D}}^{\ast }/D_s^{\ast }\bar{D}$ threshold
• Toward charged $Z_{cs}(3985)$ structure under a reflection mechanism
• Axial meson exchange and the $Z_c(3900)$ and $Z_{cs}(3985)$ resonances as heavy hadron molecules
• Strange hadrocharmonium
• Hidden-charm tetraquarks with strangeness in the chiral quark model
• Hidden and doubly heavy molecular states from interactions $D_{(s)}^{(\ast )}{\bar{D}}_s^{(\ast )}$/$B_{(s)}^{(\ast )}{\bar{B}}_s^{(\ast )}$ and $D_{(s)}^{(\ast )}{D}_s^{(\ast )}$/$B_{(s)}^{(\ast )}{B}_s^{(\ast )}$
• A unified description of the hidden-charm tetraquark states $Z_{cs}(3985)$, $Z_c(3900)$ and $X(4020)$
• Magnetic dipole moment of the $Z_{cs}(3985)$ state: diquark-antidiquark and molecular pictures
• Understanding the nature of the heavy pentaquarks and searching for them in pion-induced reactions
• Photoproduction of strange hidden-charm and hidden-bottom states
• The newly observed $Z_{cs}(3985{)}^{-}$ state: in vacuum and a dense medium
• ${\bar{D}}_s^{(\ast )}{D}^{(\ast )}$ molecular state with $J^P=1^{+}$
• Configuration mixing in strange tetraquarks $Z_{cs}$
• Strange hidden-charm tetraquarks in constituent quark models
• Magnetic dipole moments of the $Z_c(4020{)}^{+}$, $Z_c(4200{)}^{+}$, $Z_{cs}(4000{)}^{+}$ and $Z_{cs}(4220{)}^{+}$ states in light-cone QCD
• Threshold effects as the origin of $Z_{cs}(4000)$, $Z_{cs}(4220)$ and $X(4700)$ observed in $B^{+}\to J/\psi \varphi K^{+}$
• Study on $Z_{cs}$ and excited $B_s^0$ states in the chiral quark model
• Triangle relations for XYZ states
• Recoupling Mechanism for exotic mesons and baryons
• Semi-inclusive lepto-production of hidden-charm exotic hadrons
• Double Exotic States Productions in Pion and Kaon Induced Reactions
• Chiral Symmetry Breaking by Monopole Condensation
• Isospin analysis of $B\to D^{\ast }\bar{D}K$ and the absence of the $Z_c(3900)$ in $B$ decays
• Spectrum of Hidden-Charm, Open-Strange Exotics in the Dynamical Diquark Model