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Search for Dimuon Decays of a Light Scalar Boson in Radiative Transitions Upsilon -> gamma A0

We search for evidence of a light scalar boson in the radiative decays of the Upsilon(2S) and Upsilon(3S) resonances: Upsilon(2S,3S)-> gamma A0, A0 -> mu^+ mu^-. Such a particle appears in extensions of the Standard Model, where a light CP-odd Higgs boson naturally couples strongly to b-quarks. We find no evidence for such processes in the mass range 0.212<= m(A0)<= 9.3 GeV in the samples of 99*10^6 Upsilon(2S) and 122*10^6 Upsilon(3S) decays collected by the BABAR detector at the PEP-II B-factory and set stringent upper limits on the effective coupling of the b quark to the A0. We also limit the dimuon branching fraction of the eta_b meson: BR(eta_b->mu^+mu^-)<0.9% at 90% confidence level.

preprint2009arXivOpen access
The BABAR CollaborationB. Aubert
hep-ex
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Imported metadata coverageMissing code, dataset, citation and institution fields are tracked without dominating the paper.Details
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The BABAR CollaborationB. Aubert

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