Radiative transitions from Upsilon(5S) to molecular bottomonium

TL;DR

This paper explores the possibility of discovering new molecular bottomonium-like states with specific quantum numbers through radiative transitions from Upsilon(5S), based on heavy quark spin symmetry principles.

Contribution

It predicts the existence and properties of G-odd molecular bottomonium-like states and suggests their potential observation via radiative transitions from Upsilon(5S).

Findings

Prediction of 2-4 G-odd molecular bottomonium states.

Proposal of radiative transitions as a detection method.

Application of heavy quark spin symmetry to transition amplitudes.

Abstract

The heavy quark spin symmetry implies that in addition to the recently observed Z(10610) and Z(10650) molecular resonances with $I^G=1^+$ there should exist two or four molecular bottomonium-like states with $I^G=1^-$. Properties of these G-odd states are considered, including their production in the radiative transitions from Upsilon(5S), by applying the same symmetry to the Upsilon(5S) resonance and the transition amplitudes. The considered radiative processes can provide a realistic option for observing the yet hypothetical states.