Hidden-Beauty Charged Tetraquarks and Heavy Quark Spin Conservation

Abstract

Assuming the dominance of the spin-spin interaction in a diquark, we point out that the mass difference in the beauty sector M(Z_b^prime) - M(Z_b) scales with quark masses as expected in QCD, with respect to the corresponding mass difference M(Z_c^prime) - M(Z_c). Notably, we show that the decays Upsilon(10890) --> Upsilon(nS) pi pi and Upsilon(10890) --> (h_b(1P), h_b(2P)) pi pi are compatible with heavy-quark spin conservation if the contributions of Z_b,Z_b^prime intermediate states are taken into account, Upsilon(10890) being either a Upsilon(5S) or the beauty analog of Y_c(4260). Belle results on these decays support the quark spin wave-function of the Z states as tetraquarks. We also consider the role of light quark spin non-conservaton in Z_b,Z_b^prime decays into B B^* and B^* B^*. Indications of possible signatures of the still missing X_b resonance are proposed.

arXiv comment5 pages, comments added, to appear in Phys Rev D

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Cited by in corpus (31)

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• Study of doubly heavy tetraquarks in Lattice QCD
• Pentaquark states in a diquark-triquark model
• X(3872) and Y(4140) using diquark-antidiquark operators with lattice QCD
• Hybridized Tetraquarks
• Open-charm tetraquark $X_c$ and open-bottom tetraquark $X_b$
• Hidden charm octet tetraquarks from a diquark-antidiquark model
• General considerations on the nature of $Z_b(10610)$ and $Z_b(10650)$ from their pole positions
• Novel approaches in Hadron Spectroscopy
• Probing the nature of Z_c states via the eta_c rho decay
• Heavy quark symmetry and weak decays of the $b$-baryons in pentaquarks with a $c\bar{c}$ component
• Can $X(5568)$ be a tetraquark state?
• Light Quark Spin Symmetry in $Z_b$ Resonances?
• Doubly charmed tetraquarks in a diquark-antidiquark model
• B_c^+- decays into tetraquarks
• Y(4260) --> gamma + X(3872) in the diquarkonium picture
• Production of Charmed Tetraquarks from $B_c$ and $B$ decays
• Spectroscopic parameters and decays of the resonance $Z_b(10610)$
• Production of the $Z_b^{(\prime )}$ states from the ${\rm Y}(5S,6S)$ decays
• The nature of $Z_b$ states from a combined analysis of ${\rm Y}(5S)\to h_b(mP){\pi }^{+}{\pi }^{-}$ and ${\rm Y}(5S)\to B^{(\ast )}{\bar{B}}^{(\ast )}\pi$
• Possible hadronic molecular states composed of $S$-wave heavy-light mesons
• Tetraquark states in the bottom sector and the status of the $Y_b$(10890) state
• A note on the newly observed Y(4220) resonance
• Tetraquark Masses by using extension of Gursey-Radicati Mass Formula
• A mixing model for bottomoniumlike $Z_b$ resonances
• Modification by pion exchange of near threshold resonance line shape in open heavy flavor channel
• Mass-Spectroscopy of [$bb][\bar{b}\bar{b}$] and [$bq][\bar{b}\bar{q}$] tetraquark states in a diquark-antidiquark formalism