${\rm Y}(6S)$ and triangle singularity in $e^{+}{e}^{-}\to B_1(5721)\bar{B}\to Z_b(10610)\pi$

Abstract

We discuss the possibility that production of final states with bottomonium and light mesons at the peak ${\rm Y}(6S)$ in the $e^{+}{e}^{-}$ annihilation at approximately 11.00 GeV is in fact due to a triangular singularity at the threshold of the heavy meson pair production $B_1(5721)\bar{B}+c.c.$ through the process $e^{+}{e}^{-}\to B_1(5721)\bar{B}\to Z_b(10610)\pi$. The presence of the hidden-bottom resonance $Z_b(10610)$ then explains the observed enhanced production of the final channels with both ortho- and para- bottomonium states, ${\rm Y}(nS)\pi \pi$ and $h_b(kP)\pi \pi$. The discussed mechanism also predicts a distinct pattern for production of hidden-bottom states at the ${\rm Y}(6S)$ energy that can be tested by experiment.

arXiv comment11 pages, 3 figures

References in corpus (14)

• Observation of two charged bottomonium-like resonances in Y(5S) decays
• Decoding the riddle of Y(4260) and $Z_c(3900)$
• Heavy quark spin structure in Z_b resonances
• Are Y(4260) and {\rm Z${}_2^{+}$(4250)} ${\mathrm{D}}_1\mathrm{D}$ or ${\mathrm{D}}_0{\mathrm{D}}^{\ast }$ Hadronic Molecules?
• Radiative transitions from Upsilon(5S) to molecular bottomonium
• $Y(4260)$ as the first $S$-wave open charm vector molecular state?
• Exploring the threshold behavior and implications on the nature of Y(4260) and $Z_c(3900)$
• Energy scan of the $e^{+}{e}^{-}\to h_b(nP){\pi }^{+}{\pi }^{-}$ $(n=1,2)$ cross sections and evidence for ${\rm Y}(11020)$ decays into charged bottomonium-like states
• Suppression of the S-wave production of (3/2)^+ + (1/2)^- heavy meson pairs in e^+e^- annihilation
• Measurements of the ${\rm Y}(10860)$ and ${\rm Y}(11020)$ resonances via $\sigma (e^{+}{e}^{-}\to {\rm Y}(n\mathrm{S}){\pi }^{+}{\pi }^{-})$
• Precise measurements of the properties of the B_1(5721)^(0,+) and B_2*(5747)^(0,+) states and observation of B^(+,0) pi^(-,+) mass structures
• Observation of the D1(2420)->DPI+PI- decays
• $e^{+}{e}^{-}\to \gamma X(3872)$ near the $D^{\ast }{\bar{D}}^{\ast }$ threshold
• A Study of P-wave Heavy Meson Interactions in A Chiral Quark Model

Cited by in corpus (13)

• Hadronic molecules
• The $XYZ$ states: experimental and theoretical status and perspectives
• Pentaquark and Tetraquark states
• A review of the open charm and open bottom systems
• Bottomonium-like states: physics case for energy scan above the $B\bar{B}$ threshold at Belle-II
• Anomalous enhancement of the isospin-violating $\Lambda (1405)$ production by a triangle singularity in ${\Lambda }_c\to {\pi }^{+}{\pi }^0{\pi }^0{\Sigma }^0$
• Triangle singularity in ${\tau }^{-}\to {\nu }_{\tau }{\pi }^{-}{f}_0(980)$ ($a_0(980)$) decays
• $P$-wave coupled channel effects in electron-positron annihilation
• Production of the $Z_b^{(\prime )}$ states from the ${\rm Y}(5S,6S)$ decays
• Hidden-charm pentaquark formation in antiproton - deuterium collisions
• Sum rules for interaction of ${\rm Y}$ resonances with $Z_b\pi$
• Some properties of the states at the hidden-strangeness mixed ${\frac{1}{2}}^{+}+{\frac{1}{2}}^{-}$ heavy meson pair threshold in $e^{+}{e}^{-}$ annihilation
• Equality of $e^{+}{e}^{-}$ production amplitudes for scalar-vector and pseudoscalar-axial heavy meson-antimeson pairs