Exclusive $eta_b$ decay to double $J/ψ$ at next-to-leading order in $alpha_s$

Details Exclusive $eta_b$ decay to double $J/ψ$ at next-to-leading order in $alpha_s$ Exclusive $eta_b$ decay to double $J/ψ$ at next-to-leading order in $alpha_s$

2008-08-07

arxiv.org/abs/0808.1034v2

Phys.Lett.B670:350-355,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

v2,16 pages, 3 figures; References added/updated, presentation refined, minor mistakes corrected. The absence of Coulomb diver

Scientific paper

10.1016/j.physletb.2008.10.063

Within the nonrelativistic QCD (NRQCD) factorization framework, we calculate the exclusive decay process \eta_b \to J/\psi J/\psi to next-to-leading order in the strong coupling constant, while at leading order in charm quark relative velocity. It is found that this new contribution to the amplitude is comparable in magnitude with the previously calculated relativistic correction piece, but differs by a phase about 90^\circ. Including this new contribution will increase the previous prediction to B(\eta_b \to J/\psi J/\psi) substantially, thus brightening the discovery potential of this clean hadronic decay channel of \eta_b in the forthcoming LHC experiment.

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