Possible interpretation of the $Z_b$(10610) and $Z_b$(10650) in a chiral quark model

Abstract

Motivated by the two charged bottomonium-like resonances $Z_b$(10610) and $Z_b$(10650) newly observed by the Belle collaboration, the possible molecular states composed of a pair of heavy mesons, $B\bar{B},B{\bar{B}}^{\ast },B^{\ast }{\bar{B}}^{\ast },B_s\bar{B}$, etc (in S-wave), are investigated in the framework of chiral quark models by the Gaussian expansion method. The bound states $B{\bar{B}}^{\ast }$ and $B^{\ast }{\bar{B}}^{\ast }$ with quantum numbers $I(J^{PC})=1(1^{+-})$, which are good candidates for the $Z_b(10610)$ and $Z_b(10650)$ respectively, are obtained. Other three bound states $B{\bar{B}}^{\ast }$ with $I(J^{PC})=0(1^{++})$, $B^{\ast }{\bar{B}}^{\ast }$ with $I(J^{PC})=1(0^{++}),0(2^{++})$ are predicted. These states may be observed in open-bottom or hidden-bottom decay channel of highly excited ${\rm Y}$. When extending directly the quark model to the hidden color channel of the multi-quark system, more deeply bound states are found. Future experimental search of those states will cast doubt on the validity of applying the chiral constituent quark model to the hidden color channel directly.

13 pages, 1 figure, title and some arguments in the abstract and section 5 are revised, results unchanged

References in corpus (22)

• Observation of two charged bottomonium-like resonances in Y(5S) decays
• Constituent quark model study of the meson spectra
• Heavy quark spin structure in Z_b resonances
• X(3872) and Other Possible Heavy Molecular States
• Is X(3872) {\sl Really} a Molecular State?
• $Z_b(10610{)}^{\pm }$ and $Z_b(10650{)}^{\pm }$ as the $B^{\ast }\bar{B}$ and $B^{\ast }{\bar{B}}^{\ast }$ molecular states
• Observation of anomalous Upsilon(1S)pi+pi- and Upsilon(2S)pi+pi- production near the Upsilon(5S) resonance
• Bound state nature of the exotic Z_b states
• QCD corrections to tri-boson production
• Tetraquark Interpretation of the Charged Bottomonium-like states Z_b^+-(10610) and Z_b^+-(10650) and Implications
• Is Z^+(4430) a loosely bound molecular state?
• Conformal Gravity and Extensions of Critical Gravity
• Could $Z_b(10610)$ be a $B^{\ast }\bar{B}$ molecular state?
• Exotic mesons with hidden bottom near thresholds
• Decays of Zb(+) and Zb'(+) as hadronic molecules
• Charged bottomonium-like states $Z_b(10610)$ and $Z_b(10650)$ and the ${\rm Y}(5S)\to {\rm Y}(2S){\pi }^{+}{\pi }^{-}$ decay
• An alternative approach to the $\sigma$-meson-exchange in nucleon-nucleon interaction
• Investigating different structures of the Z_{b}(10610) and Z_{b}(10650)
• The bound state problem of S-wave heavy quark meson-aitimeson systems
• The effect of hidden color channels on nucleon-nucleon interaction in quark model
• Quantum chromodynamics quark benzene
• The possible candidates of tetraquark : $Z_b(10610)$ and $Z_b(10650)$

Cited by in corpus (40)

• Hadronic molecules
• The hidden-charm pentaquark and tetraquark states
• Exotic Hadrons with Heavy Flavors -X, Y, Z and Related States-
• An overview of $XYZ$ new particles
• Possible assignments of the $X(3872)$, $Z_c(3900)$ and $Z_b(10610)$ as axial-vector molecular states
• Reanalysis of the $Y(3940)$, $Y(4140)$, $Z_c(4020)$, $Z_c(4025)$ and $Z_b(10650)$ as molecular states with QCD sum rules
• The $Z_b(10610)$ and $Z_b(10650)$ as axial-vector tetraquark states in the QCD sum rules
• Heavy Hadrons in Nuclear Matter
• Confirming the molecular nature of the $Z_b(10610)$ and the $Z_b(10650)$
• Interpreting $Z_c(3900)$ and $Z_c(4025)/Z_c(4020)$ as charged tetraquark states
• $QQ\bar{q}\bar{q}$ in a chiral constituent quark model
• The line shapes of the $Z_b(10610)$ and $Z_b(10650)$ in the elastic and inelastic channels revisited
• Study of $B{\bar{B}}^{\ast }$ and $B^{\ast }{\bar{B}}^{\ast }$ interactions in $I=1$ and relationship to the $Z_b(10610)$, $Z_b(10650)$ states
• Coupled-Channel Effects for the Bottomonium with Realistic Wave Functions
• General considerations on the nature of $Z_b(10610)$ and $Z_b(10650)$ from their pole positions
• $Z_b/Z_b^{\prime }\to {\rm Y}\pi$ and $h_b\pi$ decays in intermediate meson loops model
• Charged charmoniumlike state $Z_c(3900{)}^{\pm }$ via meson photoproduction
• Line shapes in Υ(5S) \to B^{(*)} \bar{B}^{(*)}πwith Z(10610) and Z(10650) using effective field theory
• Analysis of the hidden-bottom tetraquark mass spectrum with the QCD sum rules
• $Z_b(10610)$ and $Z_b^{\prime }(10650)$ decays in a covariant quark model
• Could $Z_c(4025)$ be a $J^P=1^{+}$ $D^{\ast }\overline{D^{\ast }}$ molecular state?
• Interpretation of $Z_b(10610)$ and $Z_b(10650)$ in the ISPE mechanism and the Charmonium Counterpart
• Hadron physics potential of future high-luminosity B-factories at the Upsilon(5S) and above
• Magnetic dipole moment of $Z_b(10610)$ in light-cone QCD
• Spectroscopic parameters and decays of the resonance $Z_b(10610)$
• Insights into $Z_b(10610)$ and $Z_b(10650)$ from dipion transitions from ${\rm Y}(10860)$
• Exotic Charmonium and Bottomonium-like Resonances
• Production of the $Z_b^{(\prime )}$ states from the ${\rm Y}(5S,6S)$ decays
• Possible $D^{(\ast )}{\bar{D}}^{(\ast )}$ and $B^{(\ast )}{\bar{B}}^{(\ast )}$ molecular states in the extended constituent quark models
• The $Z_b$ structures in a constituent quark model coupled-channels calculation
• Investigations on the light hadron decays of $Z_b(10610)$ and $Z_b(10650)$
• Production and absorption of exotic bottomonium-like states in high energy heavy ion collisions
• Radially excited axial mesons and the enigmatic $Z_c$ and $Z_b$ in a coupled-channel model
• Triply Heavy $\Omega$ Baryons with JETHAD: A High-Energy Viewpoint
• $Z_b(10610)$ in a hadronic medium
• $D$ wave bottomonia production from $Z_b^{(\prime )}$ decay
• Spin Partners of the $B^{(\ast )}{\bar{B}}^{(\ast )}$ resonances with a different approach than the Breit-Wigner parameterization
• Proper constituent gluon mass as the final piece to construct hybrid mesons
• An analysis on doubly bottom molecular tetraquarks composed of $H_{(s)}$ and $T_{(s)}$ doublets
• Insights into the exotic charged states $Z_b(10610)$ and $Z_b(10650)$ from their photoproduction off nuclei