$Z_b/Z_b^{\prime }\to {\rm Y}\pi$ and $h_b\pi$ decays in intermediate meson loops model

Abstract

With the recent measurement of $Z_b(10610)$ and $Z_b(10650)\to B{\bar{B}}^{\ast }+c.c.$ and $B^{\ast }{\bar{B}}^{\ast }$, we investigate the transitions from the $Z_b(10610)$ and $Z_b(10650)$ to bottomonium states with emission of a pion via intermediate $B{B}^{\ast }$ meson loops. The experimental data can be reproduced in this approach with a commonly accepted range of values for the form factor cutoff parameter $\alpha$. The ${\rm Y}(3S)\pi$ decay channels appear to experience obvious threshold effects which can be understood by the property of the loop integrals. By investigating the $\alpha$-dependence of partial decay widths and ratios between different decay channels, we show that the intermediate $B{B}^{\ast }$ meson loops are crucial for driving the transitions of $Z_b/Z_b^{\prime }\to {\rm Y}(nS)\pi$ with $n=1,2,3$, and $h_b(mP)\pi$ with $m=1$ and 2.

9 pages, 5 figures

References in corpus (7)

• X(3872) and Other Possible Heavy Molecular States
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• Effect of charmed meson loops on charmonium transitions
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• Decays of Zb(+) and Zb'(+) as hadronic molecules
• Novel analysis of the decays psi' -> h_c pi^0 and eta_c'-> chi_{c0} pi^0
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Cited by in corpus (15)

• Confirming the molecular nature of the $Z_b(10610)$ and the $Z_b(10650)$
• More hidden heavy quarkonium molecules and their discovery decay modes
• Hidden and doubly heavy molecular states from interactions $D_{(s)}^{(\ast )}{\bar{D}}_s^{(\ast )}$/$B_{(s)}^{(\ast )}{\bar{B}}_s^{(\ast )}$ and $D_{(s)}^{(\ast )}{D}_s^{(\ast )}$/$B_{(s)}^{(\ast )}{B}_s^{(\ast )}$
• Analysis of the hidden-bottom tetraquark mass spectrum with the QCD sum rules
• Resolving the puzzling decay patterns of charged $Z_c$ and $Z_b$ states
• $Z_b(10610)$ and $Z_b^{\prime }(10650)$ decays in a covariant quark model
• Magnetic dipole moment of $Z_b(10610)$ in light-cone QCD
• Hunting for the $X_b$ via hidden bottomonium decays
• Exploring the ${\rm Y}(4S,5S,6S)\to h_b(1P)\eta$ hidden-bottom hadronic transitions
• Study on the radiative decays of $h_c$ via intermediate meson loops model
• $D$ wave bottomonia production from $Z_b^{(\prime )}$ decay
• Evasion of HSR in the charmless decays of excited $P$-wave charmonia
• Radiative decays of the neutral $Z_c(3900)$ and $Z_c(4020)$
• A search for $B_{s0}^{\ast }$ and $B_{s1}^{\ast }$ through the $K^{-}p$ interaction
• An analysis on doubly bottom molecular tetraquarks composed of $H_{(s)}$ and $T_{(s)}$ doublets