$B^{(*)}\bar B^{(*)}$ intermediate state contribution to $\Upsilon(4S,5S)\to \eta_b+\gamma$ radiative decay

TL;DR

This paper investigates re-scattering effects in the radiative decay of $S$ to $_b$ plus a photon, suggesting these effects could significantly influence decay rates and help distinguish between different theoretical models.

Contribution

The study demonstrates that re-scattering effects can enhance the decay width of $S$ to $_b$ plus a photon by four orders, providing a potential way to test the underlying decay mechanisms.

Findings

Re-scattering effects may significantly increase decay widths.

Tetraquark structure does not produce similar enhancement.

Future measurements could distinguish between re-scattering and tetraquark models.

Abstract

In this work, we investigate the re-scattering effects in the radiative decay $\Upsilon(5S)\to\eta_b+\gamma$, which were suggested to be crucially important for understanding the anomalous largeness of the branching ratios $B(\Upsilon(5S)\to \Upsilon(1S)+\pi\pi)$ and $B(\Upsilon(5S)\to \Upsilon(1S)+\eta)$. Our calculations show that the re-scattering effects may enhance $\Gamma(\Upsilon(10860)\to \eta_b+\gamma)$ by four orders, but the tetraquark structure does not. Recently the BaBar and CLEO collaborations have measured the mass of ${\eta_b}$ and the branching ratios $\mathcal{B}(\Upsilon(2S)\rightarrow\eta_b+\gamma)$, $\mathcal{B}(\Upsilon(3S)\rightarrow\eta_b+\gamma)$. We hope that very soon, $\Upsilon(10860)\to \eta_b+\gamma$ will be measured and it would be an ideal opportunity for testing whether the re-scattering or the tetraquark structure is responsible for the anomaly of $\mathcal{B}\big(\Upsilon(5S)\rightarrow\Upsilon(nS)\pi^+\pi^- (n=1,2,3)\big)$, $i.e.$, the future measurements on the radiative decays of $\Upsilon(5S)$ might be a touchstone of the two mechanisms.