$B^{(*)}\bar B^{(*)}$ intermediate state contribution to $Υ(4S,5S)\to η_b+γ$ radiative decay

Details $B^{(*)}\bar B^{(*)}$ intermediate state contribution to $Υ(4S,5S)\to η_b+γ$ radiative decay $B^{(*)}\bar B^{(*)}$ intermediate state contribution to $Υ(4S,5S)\to η_b+γ$ radiative decay

2010-06-08

arxiv.org/abs/1006.1437v2

Phys.Rev.D82:054030,2010

Physics

High Energy Physics

High Energy Physics - Phenomenology

7 pages, 2 figures. Typos corrected and more discussions added. accepted for publication in Physical Review D

Scientific paper

10.1103/PhysRevD.82.054030

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.

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