Charged-to-neutral heavy meson yield ratio at the Z_b^0 resonances as a probe of the I^G(J^P)=0^-(1^+) channel

TL;DR

This paper proposes using the charged-to-neutral heavy meson yield ratio near the Z_b^0 resonances as a sensitive probe of the strong interaction in the I^G(J^P)=0^-(1^+) channel, potentially revealing near-threshold molecular resonances.

Contribution

It introduces a novel method to investigate the I^G(J^P)=0^-(1^+) channel through yield ratios, offering insights into near-threshold molecular states not accessible by other means.

Findings

Yield ratio is highly sensitive to strong interactions near the threshold.

The method can detect isoscalar molecular meson-antimeson resonances.

Potential identification of new near-threshold states.

Abstract

It is argued that the ratio of the yield of pairs of charged and neutral $B^{(*)}$ mesons in the processes $\Upsilon(5S) \to \pi^0 + (B \bar B^* + c.c.)$ and $\Upsilon(5S) \to \pi^0 + B^* \bar B^*$ is very sensitive near the corresponding heavy meson threshold to the strong interaction between the mesons in the $I^G(J^P)=0^-(1^+)$ channel due to significant isospin breaking by the Coulomb force. This channel, not readily accessible by other means, may contain near-threshold molecular meson-antimeson resonances --- isoscalar analogs of the isovector states $Z_b(10610)$ and $Z_b(10650)$.