Long distance contributions to the eta_b => Jpsi Jpsi decay

Details Long distance contributions to the eta_b => Jpsi Jpsi decay Long distance contributions to the eta_b => Jpsi Jpsi decay

2007-03-21

arxiv.org/abs/hep-ph/0703232v2

Phys.Rev.D77:074012,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, 3 figures. The estimate of the dispersive contribution was added. Typos corrected. To be published in Phys. Rev. D

Scientific paper

10.1103/PhysRevD.77.074012

It was argued long ago that eta_b could be observed through the eta_b => Jpsi(=> mu+ mu-) Jpsi(=> mu+ mu-) decay chain. Recent calculations indicate that the width of eta_b into two Jpsi is almost 3 orders of magnitude smaller than the one into the D bar D*. We study the effects of final-state interactions due to the D bar D* intermediate state on the Jpsi Jpsi final state. We find that the inclusion of this contribution may enhance the short-distance branching ratio up to about 2 orders of magnitude.

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