On the eta(b) => J/psi J/psi decay

TL;DR

This paper investigates how final state interactions via D D* intermediate states can significantly enhance the decay rate of eta(b) into J/psi J/psi, which is crucial for experimental observation.

Contribution

It demonstrates that including D D* intermediate states can increase the eta(b) to J/psi J/psi decay rate by about two orders of magnitude.

Findings

Final state interactions can enhance decay rate significantly.

The eta(b) to J/psi J/psi decay is more observable with these effects.

Decay width into J/psi J/psi is much smaller than into D D* without interactions.

Abstract

It has been argued long ago that eta(b) could be observed through the eta(b) => J/psi(=> mu+ mu-) J/psi(=> mu+ mu-) decay chain. Recent calculations indicate that the width of eta(b) into two J/psi is almost three order of magnitude smaller than the one into the D D*. We study the effects of final state interactions due to the D D* intermediate state on the J/psi J/psi final state. We find that the inclusion of this contribution may enhance the short distance branching ratio of about two orders of magnitude.