The nature of $Z_b$ states from a combined analysis of ${\rm Y}(5S)\to h_b(mP){\pi }^{+}{\pi }^{-}$ and ${\rm Y}(5S)\to B^{(\ast )}{\bar{B}}^{(\ast )}\pi$

Abstract

With a combined analysis of data on ${\rm Y}(5S)\to h_b(1P,2P){\pi }^{+}{\pi }^{-}$ and ${\rm Y}(5S)\to B^{(\ast )}{\bar{B}}^{(\ast )}\pi$ in an effective field theory approach, we determine resonance parameters of $Z_b$ states in two scenarios. In one scenario we assume that $Z_b$ states are pure molecular states, while in the other one we assume that $Z_b$ states contain compact components. We find that the present data favor that there should be some compact components inside $Z_b^{(\prime )}$ associated with the molecular components. By fitting the invariant mass spectra of ${\rm Y}(5S)\to h_b(1P,2P){\pi }^{+}{\pi }^{-}$ and ${\rm Y}(5S)\to B^{(\ast )}{\bar{B}}^{\ast }\pi$, we determine that the probability of finding the compact components in $Z_b$ states may be as large as about $40\%$.

Discussions added, version published in EPJC

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Cited by in corpus (10)

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• General considerations on the nature of $Z_b(10610)$ and $Z_b(10650)$ from their pole positions
• $Z_b(10610)$ and $Z_b^{\prime }(10650)$ decays in a covariant quark model
• Magnetic dipole moment of $Z_b(10610)$ in light-cone QCD
• Hidden-bottom hadronic transitions of ${\rm Y}(10753)$
• Production and absorption of exotic bottomonium-like states in high energy heavy ion collisions
• $Z_b(10610)$ in a hadronic medium
• Predictions of ${\rm Y}(4S)\to h_b(1P,2P){\pi }^{+}{\pi }^{-}$ transitions